El Hierro

[woe10]

Talking Eggs Movie.

http://www.youtube.com/watch?v=eW9vOrgY_K4&feature=related

[jand]

Avcan copied and translated.

Therefore not be if it will be or not, but these recent earthquakes are making rise again released seismic energy accumulated on the last curve... the next to see if it confirms this behavior or is just a one-off thing.(Henry) http://www.avcan.org/sismica/graficas/G761.jpg?t=1324555825

[jand]

[jand]

Update 23/12 – 08:07 UTC
 - 2 new earthquakes since midnight UTC . Both had a magnitude of 1.6 at a depth of respectively 16 and 05 km. The first one happened at 02:16 (epicenter location) and the second at 04:09 (epicenter location)
 - variable harmonic tremor
 - 25 cruise ships have planned to visit El Hierro next year. The port of La Estacza will be the embarkation port. The average number of passengers will be 300 per ship.
 - the company running the Christmas lottery, one of the first lotteries in te world, has decided to pay 60,000 euro as a gift to the people of El Hierro.
 - the Terencio supermarket chain did send a food load of 4200 kg to help the Herreños

[jand]

Avcan FB Copied.
Emrique que opinais de los sismos de estos ultimos dias? Hay nueva aportacion de material o se esta acumulando de nuevo energia por algun taponamiento del conducto o boca?

Emrique you think of the earthquakes of the last few days? There new contribution of material or is this again accumulate energy by some tamponade of the duct or mouth? (Translated by Bing)

Yurena so far, it is difficult to specify only with earthquakes, but seeing the deformation, there seems to be a new contribution of material magmatico by the Gulf area, thing to confirm if we have a spike in the emitted gases...(Henry).

[jand]

This is long but interesting to read copied from volcanocafe.

Carlos says:

 December 24, 2011 at 00:17

Two mechanisms favor the development of a radial dikes
 volcano. The first is the distribution of stresses due to gravity
 the building load. This controls the maximum path
 compressive stress, which becomes subparallel to the slope of the
 Volcano (Dieterich, 1988), while the minimum compressive stress is
 tangential (Fig. 4a; Acocella and Tibaldi, 2005 and references therein).
 The largest and highest volcano, therefore, the stronger the
 local maximum stress (McGuire and Pullen, 1989). Locally, the spread
 radial dikes path can be controlled by the presence of
 significant scarps or other topographic irregularities on the volcano
 flanks. In this case, the trajectory of the maximum compressive stress
 varies in the range escarpment, becoming subparallel to the escarpment, the
 minimum compressive stress becomes perpendicular to the direction
 of the scarp (Fig. 4B). As a result, dikes tend to propagate parallel to the
 major volcanic cliffs, like Stromboli and Etna, Italy (McGuire
 and Pullen, 1989, Ferrari et al, 1991. Tibaldi, 2003, Neri et al, 2004.;
 Acocella and Tibaldi, 2005, Rust et al, 2005;. Walter et al, 2005b;. Neri
 and Acocella, 2006, Neri et al, 2007) .. Similarly, elongated volcanic
 buildings are characterized by a maximum compressive stress
 oriented parallel to the axis of the building, these conditions
 resulted in the development of dikes oriented parallel elongation
 the building (Fig. 4C, Fiske and Jackson, 1972). Notable examples of
 rift zones parallel to the elongation of the main building are Mauna
 Loa and Kilauea volcanoes, Hawaii (Decker, 1987), although the
 form of both volcanoes can be controlled by lateral instability. The
 The second mechanism for controlling the development of radial dikes
 radially oriented maximum compressive stress due to pressurization
 in a magma reservoir beneath the surface (Knopf, 1936, Oda, 1957). In this case,
 radial dikes form to accommodate the expansion of the circumference of the
 the building with relief, due to inflation of the volcano (Acocella et al.
 2001 and references therein).
 Radial dikes propagate vertically or laterally from the
 central conduit of the volcano along the slopes of the volcano. The mechanism of
 lateral propagation of dikes from the summit of a volcano
 building is still poorly understood. Observational evidence
 suggests that the direction of propagation may depend in part on the
 closing / opening of the central canal (Fig. 5,. Acocella et al, 2006b).
 When the central canal is closed or solidifies, the magma is emplaced in
 the building by vertically propagating dikes in the upper
 the building, along the frozen canal, they can continue to gravitational
 highlights, becoming radial. By contrast, the lateral spread of the levees
 is widespread, but not exclusive (Acocella and Neri, 2003; Lanzafame
 et al., 2003), volcanoes are characterized by an open-topped tube.
 Here, the magma in the upper tube and degassed,
 increasingly dense, butts lateral spread down the slope. Remarkable
 Examples of behavior include volcanoes Tenerife
 (Soriano et al., 2008), Etna (Acocella and Neri, 2003), Stromboli
 (Acocella et al, 2006a). And Vesuvius (between 1631 and 1944, Acocella
 et al., 2006b). Estimates of Etna and Vesuvius suggests that the average
 along the strike of the upper surface of a lateral dike propagation has a moderate downhill drop in the order of 10 ° -15 ° (Acocella et al., 2006c, and
 references therein). This mechanism of radial dikes placement
 generally limited to the top of the building, below the slope.
 Therefore, the specific conditions that control (ie, opening / closing
 conduit) need not be the same as those of the radial dikes
 spread at the base of the volcano, for example, notes
 Summer Coon Volcano (Poland et al., 2008).
 2.2. What controls the spread of a volcanic dyke in different buildings
 These characteristics establish general guidelines for a dam
 propagation in volcanic edifices. The relationships between these characteristics
 (For example, topography, regional stress field vs local) and other factors (eg
 the shape of the volcano, magma composition) in the context of a dam
 spread has not been investigated in detail. Here, our goal is
 bridging this gap, with a semi-quantitative analysis of the relationships
 between the various factors related to the site of the dam. We believe
 several features, which are listed in Table 1, in relation to the site of the dam to 25
 volcanic activity centers. These features include: 1) height (H1) to the
 base of the building, including any part submerged. 2) Aspect Ratio
 (A) of the building (where A = height / width). 3) eccentricity (e) of the
 building (where E = minimum elongation / maximum elongation).
 4) The average SiO2 content magmas erupted, which is expected to
 approximately a first order of viscosity, the average magma. It is possible
 the levees are far from average composition, but this possibility
 have not taken into account in this study. 5) The maximum length (L)
 achieved by dikes or, more commonly, an eruptive fissure
 volcano, in both cases it is possible that the actual length of the dam
 may be greater than that of the visible, so this length must
 be considered as a benchmark. 6) Difference in height (Hd)
 between the top and bottom of the longest crack or
 outcrop of a dike, this refers to the subaerial part of the dam
 or fissure and thus may differ significantly from H1. 7) The frequency of
 Fig 5. Dikes mostly propagate laterally (a) when the summit conduit is open, and the magma and degassing, and vertical (b) when the duct closes.
 Fig 4. The most common forms of relief volcanic edifices (2D, see map) and the conditions related to local stress (óHMAX = maximum horizontal stress, minimum horizontal óHmin =
 stress). (A) cone, (b) cone with sector collapse, (c) ridge. The maximum horizontal stress is radial of a cone, slightly diverging in a cone with sector collapse and elongated in a hill.

radial vs. circumferential dikes or fissures in a volcano, designated
 RT (where RT = number of radial dikes / number of radial + circumferential
 dams). The frequency of regional dykes against radial + circumferential dikes
 a volcano, called RR (where RR = the number of regional dikes /
 number of regional radio + + circumferential dikes). The active participation of 25
 Volcanoes have been selected based on the availability of data (from
 previously published studies), the variability of the building (eg, boilers,
 shield volcanoes, composite volcanoes), and the tectonic setting (eg
 regional extension, regional compression, hot spots). The general
 the relationships between these characteristics are summarized in Fig. 6.
 The distribution of RR values #8203;#8203;of selected volcanoes shows a
 cluster RR = 0, where systems are dominant radial or circumferential
 and regional dikes are absent (Fig. 6a). These ocean island volcanoes
 protective activity related to hot spots and away from the borders with fromplate
 strong regional stress fields. Another RR ~ 0.5 represents stratovolcanoes
 with a similar proportion of local and regional dams controlled
 or cracks. A third set of data, about RR = 1, corresponds to
 shield volcanoes along the axis of oceanic cracks, characterized by a strong
 regional control over the placement of the dam. The histogram shown in Fig. The 6th
 therefore, indicates that the locale affects the pattern of dam
 a volcano with varying degrees of intensity.
 The distribution of the selected RT suggests volcanoes
 volcanic edifices that reflect to a large extent on the surface, dikes or
 cracks, with a radial attitude (RT = 1. Fig. 6b). A smaller number of
 Volcanoes are a significant component of the levees or circumferential
 cracks, but the values #8203;#8203;of RT are not less than 0.5. 6b thus confirms
 the levees circumferential surface of the active volcanoes
 unusual, in contrast to the observations of the patterns of subsurface dam
 (See Section 2.1.2). The discrepancy between surface and depth of the dam
 guidance suggests that greater radial compressive stress induced
 by the relief of the volcanic structure is imposed on shallow
 inhibition of the spread up the levees in circumference and / or
 rotation of these to the surface.
 There is a poor correlation between the degree of regional control
 at the site of the dike or fissure (RR) and the eccentricity of the base
 the volcano (Fig. 6c). In fact, very elongated volcanic
 buildings are not always controlled by regional tectonics. However,
 Kilauea and Mauna Loa neglect (arrows in Fig. 6c), whose rupture zone
 forms are heavily influenced by the sliding of the slope of Hawaii
 and existing topography of the volcanoes (Fiske and Jackson, 1972;
 Walter et al., 2006, and references therein), a major
 correlation is obtained (dashed line in Fig. 6c). This relationship is
 reinforced by the fact that, with the exception of hot spot volcanoes, the
 buildings tend to be elongated normal to the regional minimum compressive
 stress. Therefore, for volcanoes that are isolated and without
 major flank slip, the data suggest that there may be a general
 correlation between the elongation of a volcano and the pattern of
 controlled regional dams.
 There is also an inverse correlation between regional tectonics
 control at the site of the dam (RR) and the maximum height of a
 volcano above its base (H1,. Fig. 6d). Volcanoes located in hot spots
 settings have not been considered in this scheme, since they lack any
 regional control. The inverse correlation suggests that the highest volcanoes
 are characterized by a radial distribution of dikes or fissures that
 tends to be more isotropic, which implies that the control of a regional
 stress vanishes with the size field of the volcano. In general, the volcanoes
 higher than 3 km show no significant evidence of regional tectonic
 control at the site of the dam. Similar conclusions have been
 suggested by the Etna, which has been proposed that regional
 tectonic control on the propagation of a dike at the top of the building was replaced by a local field, topographic stress (McGuire and
 Pullen, 1989).
 The development of radial dikes was analyzed in terms of H1,
 HD, and SiO2. There is a direct proportion between the maximum
 length of a fissure or dike (L) and total height
 volcano (Fig. 6e). The association of more cracks or dikes with the highest
 volcanoes suggests topographic control the spread of the dam. similar results are suggested in Fig. 6f, indicating a direct proportionality
 between L and differential vertical height of the crack or
 dike. The behavior may be associated with dikes of propagation
 downhill side from the top of an open passageway. In fact,
 It is expected that the most superficial of the dam was separated from the central
 duct, the greater the potential force of energy and will spread;
 therefore, the dam spread laterally a greater distance. there
 clear evidence that such lateral spread of the levees only ~ 30% of the
 considers volcanoes (Table 1), evidence that is necessary to continue
 generalize this behavior.
 The correlation between the maximum duration of an eruption
 fissure or dike (L) and SiO2 content related magma (Fig. 6 g)
 is poor, indicating that the composition and / or viscosity of the magma
 not significantly limit the spread of the dam. This is in accordance with
 Stromboli recent data showing that the petrochemical industry characteristics
 magma, including viscosity, have a very low influence on the
 the geometry of the propagation of the dike (Corazzato et al., 2008).
 There is also no correlation between the maximum duration of a
 eruptive fissure or dike (L) and the aspect ratio of the volcano
 (A, Figure 6h.). Apparently, the inclination of the slope of the volcano, in relation to
 the aspect ratio of the building has no influence on the propagation of the dike.
 Finally, there is a direct proportionality between the aspect ratio
 the volcanic edifice (A) and height of the vertical differential
 eruptive fissure (HD, Fig. 6i). The result implies that the steepest volcanoes
 are also associated with eruptive fissures with a greater difference in
 height, therefore, despite the length of the dam is not controlled
 the slope of the volcano (Fig. 6h), the drop in altitude
 dam may depend on the inclination of the slope of the volcano

http://www.earth-prints.org/bitstream/2122/4138/6/Acocella%20and%20Neri%20Tecto2008.pdf

Source: Acocella, V., Neri, M., Dike propagation in volcanic edifice: Overview and possible Developments, Tectonophysics
 (2008), doi: 10.1016/j.tecto.2008.10.002



Reply

schteve says:

 December 24, 2011 at 00:29

Hi again Carlos,
 This is too difficult to understand in Google translation, Google doesn't quite understand the subtleties...

Reply

Carlos says:

 December 24, 2011 at 00:21



Reply

sativacyborg says:

 December 24, 2011 at 00:22

I WAS SO WRONG O.o (sorry for the caps, and for so many posts : i feel like i am spamming the place. ) about the location of the fissure eruption.

any way after the earlier overlaps of the stain satellite pictures i started noticing how the stain follows the direction of the mounts ,valleys and cliffs and such even when visible only from the top. (if any one wants more on that i can prepare some pics)
 then i thought hey lets look at that fissure picture again... this is the result.
 http://img805.imageshack.us/img805/3521/sowrong.jpg
 compare them at the bottom as its not exactly overlapped but the lines fit perfectly.

Reply

schteve says:

 December 24, 2011 at 00:53

Very impressive mate, and a schplendid overview. We are beginning IMHO to catch up with the "government schientists." Joke's schcreenschots show some plots that are beyond anything we can do here, and the "government schientists" (hopefully) know at least as much as we do...?
 Or do they??
 Please, I'm not trying to scaremonger here, jus chattin innit x

Reply

Edward Lane says:

 December 24, 2011 at 00:55

Thats quite convincing

Reply

Carlos says:

 December 24, 2011 at 00:34


For schteve (and all).

5 millions of cubic meters on 4 days.
 http://www.canarias7.es/articulo.cfm?id=237696

You can compare spectrogram amplitude in 24-28th october an the spectrogram now in this days.

Reply

GeoLurking says:

 December 24, 2011 at 07:27

5 million in four days?

Entirely conceivable. Base on my banged up Mogi model the fill rate and likely average discharge rate:

With an 80 day fill period, that gives us roughly 798,645 m³/d intrusion over the course of the start of the quakes until about 9 October.

Reply

[jand]

Update 23/12 – 18:43 UTC
 Joke has created a small video from the pictures that she made while traveling with the bus from La Restinga to El Pinar.

http://www.youtube.com/watch?feature=player_embedded&v=_za0NTWFVio#!

[jand]

The volcano located in the calm sea has issued 5.5 million cubic metres of material in just four days, as they have revealed the data collected during the expeditions of the Spanish Institute of Oceanography (IEO).

The Institute has seen the rapid growth of the submarine volcano of El Hierro with the images collected by the team embarked on Ramón Margalef between 24 and 28 October.

The researcher and Marine Geologist of the IEO Juan Acosta, said that the comparison of the two maps shows a change in the form of the heat of the volcano and seen "substantial growth" of the cone and the volcanic heat.

To superimpose both maps, researchers have been able to estimate that only in those four days the volcano issued almost 5.5 million cubic metres of materials and even though they are estimated data "are much closer to reality", has tempered Acosta.

The volcano is still active and "much stronger", said the investigator, not only emit gases and material fine, "visible from the surface" but still emitting lava.

When the situation is more stable in the area it will have to make another recognition and repeat the operation because it is the only way to scientifically prove the increase of activity under the sea, explained Acosta.

At the moment the ship Ramón Margalef is in the port of Los Cristianos (Tenerife), as civil protection has banned the navigation in the area of the calm sea.

The boat continues waiting for the official authorization to initiate studies on the part of the Gulf, which according to Acosta, could start tomorrow.

"The IEO would be delighted to be able to be useful there" and the boat will be available when it is "necessary", Acosta has insisted.
canarias7.es

The Spanish Institute of Oceanography (IEO) is a public research body, dedicated to the knowledge of the sea through nine coastal oceanographic centres, twelve stations mareográficas and a fleet of seven research vessels, which included Cornide Saavedra and Ramón Margalef.

[jand]

Diane Barnes Vocanocafe copied.

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2011-12-24&ver=s&estacion=CHIE&Anio=2011&Mes=12&Dia=24&tipo=1

Bob looks like he has started some mini chugging!

I also thought I saw some bubbling just above the right harbour wall, but it is still rather dark and colours are not clear yet. It could just be rough sea.
 I have been watching again and there is definitely a patch of lighter colour that seems turbulent above right of the right harbour wall. Maybe I am seeing things not there really!!!!!
 http://hierroendirecto.movistar.es/

[jand]

Note 397 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 24 December 2011-10: 00 h peninsula - earthquake and volcanic activity continues pluviometry, localized seismicity, but with some event detected weak (at 23: 07 h yesterday, 00, 0520, and 06: 23 h). An important signal of volcanic tremor continues in the area of la Restinga, with an amplitude that is on the increase (15%) from the last part, with some explosions, possibly hidromagmaticas. There is no new localised earthquakes. 1 The day before yesterday. Yesterday 2. Today will be 0. In total van 11943 earthquakes located in El Hierro by IGN from 9: 00 pm of the day 19 July 2011.

Remarkable today the deformation, especially the HI04 which goes back to his tendency to deformation (away from border) and HI03 does not move. FRON also seems that it resumes its trend regard IZAN TN03 and MAZO (approaches).

[TripleH]

MERRY CHRISTMAS

jand...where are you??

[jand]

Important Update 25/12 – 09:23 UTC
 - IGN reported a new M 1.6 earthquake at a depth of 21 km at 01:14. Epicenter in the El Golfo bay
 CISC (Unidad de Tecnología Marina del Consejo Superior de Investigaciones Científicas) has reported yesterday that the top of the main vent has collapsed 15 to 20 meter.  The new depth was obtained during a bathymetry mission by the research vessel Sarmiento de Gamboa. The acoustic image was made last Thursday and Friday (when we saw the Sarmiento de Gamboa going up and down on the stain) .The white line on the image is the sea floor. The orange tones are  reflecting the erupted magma. The suspended material that we can see in the stain and on the emission vents is colored brown (ER: hard to see but on top). The orange colored magma is flowing down along the slopes of the cone.
 Last time, the depth of the cone was measured as 140 to 150 meter by the Ramon Margalef. Taking into account the new acoustic study, we can conclude that the depth is now in between 155 and 170 meter, still far away from a Surtseyan eruption.

[jand]

volcanacafe copied .

I wonder if anyone realizes that that image is not a linear profile. (straight line over Bob)

While trying to get a feel for the actual volume of the cone, you need to be able to determine the angles of the sides. To do this, you have to know the units that the height and width are in. A simple "rise over the run" trig function will tell you the angles. (tangent).

Looking at the image, the Longitude is truncated. near-abouts at the decimal portion of the figure. Okay... we can probably work through that. But when you take a look at the Latitude, you get 27.62021 N, 27.62002 N, 27.62023 N.

Sort of weird. One possibility is that the middle value is an error in the display/image capture and it should read 27.62022 N rather than 27.62002 N.

If it's 27.62002 N, then the first increment would be 21.05 meters and the second one would be 23.27 meters going pretty much back over the first block.

If it's 27.62022 N, then each block would be 1.11 meters. Which is also a bit weird.

This is all based on on one degree of Latitude being about 110813 meters at 27.62°N.

It's too bad that whoever drives this show can't release one clean image that isn't massaged to be as obtuse as possible.

Reply

KarenZ says:

 December 25, 2011 at 22:20

@GeoLurking. You're right there is something weird about the latitudes shown on the picture. But are we supposed to be looking at?

Reply

GeoLurking says:

 December 26, 2011 at 08:02

Well, ostensibly it's the cone of Bob... in cross section. If the section isn't planar... as implied by the image, then it's the profile up one side and down a different angle. Judging from those Latitude marks, it could be up one side and back down the same side, offset by a slightly different angle.

That's about the only thing I can determine from the wonky nomenclature that would explain it.

[jand]

Alison says:

 December 26, 2011 at 09:44

The tremor plot for Bob seems to be out of order today. Must be the Xmas holidays.
Looking at the overview of La Restinga there're two distinct areas of stain though, but the close up video hasn't been working for me for a few days.

Reply
Edward Lane says:

 December 26, 2011 at 10:36

seems to be out for all the different machines – most seem to have section between 8 and 10 today but some are still missing the 9-10, and all of them are missing the data from the earlier hours. I guess the machine that is hosting the data lost connection or something, otherwise why would seismograph machines on several islands all go offline at the same time (not likely without the use of a 2012 conspiracy anyway).

Reply

[jand]

earthquake-report.com

Update 26/12 – 10:29 UTC
 - RTVC, the Canary Island Television broadcaster seems to have given up on their El Hierro eruption webcam operations . The webcam was no longer active since a couple of days. It hopefully remains on the mast as this webcam was by far the best from all available webcams.  Nothing is 100% sure as long as the eruption did not stop completely. If the volcano goes again into a more active state (people following Etna eruptions do know what this means) the activity level can change in a couple of hours.

Update 26/12 – 10:12 UTC
 - At 00:28 a very weak 0.6 earthquake occurred at a depth of 12.2 km. Click here for the epicenter location.
 - Harmonic tremor lower medium as the last couple of days
 - Recognizable stain from the ongoing eruption on the La Restinga village webcam (the other webcam has stopped working since a couple of days). The emitting vent can be recognized if you draw a vertical line from leftist entrance of the harbour to the horizon. There might be no emission line recognizable at the time of looking to the image, but extended watching will suddenly reveal the vent. This can also be seen very well on the time lapse videos from Julio del Castillo Vivero

[jand]

schteve says:

 December 26, 2011 at 14:20


http://i1103.photobucket.com/albums/g480/jand3/Eventos_HIERRO_101.jpg[/IMG]


Hi all been reading but not posting, been pretty busy... Hope you all are having a nice Christmas.
 The link is IGN's plot of the Eqs of the last 10 days. Mostly tiddlers I know but, they are alternating North-South, today's (a real tiddler) Is (shallowish) under Tanganasoga...Any thoughts anyone?
 Cheers x

Reply

[jand]

Kiese We says:

 December 26, 2011 at 14:08

Looks as if the graph has tremor Christmas holiday! Armand's blog reports an earthquake near Tanganasoga at 12 km. IGN nothing is reported.

Reply

Heather B says:

 December 26, 2011 at 14:16

It is reported on IGN full list: Catálogo y boletines sísmicos. You have to type in the date and click on 'Si' for Magnitude and set this to zero.

[jand]

Although its only a small earthquake the depth though is only 12km deep this earthquake happened directly below Tangangasoga and this is being discussed on other sites at the moment?

[jand]

Directorate-General for security and emergencies

The weekend saw light bubbling at sea in the area of emission

The National Geographic Institute (IGN) confirmed the direction of the Plan of Civil protection by risk volcanic (PEVOLCA) that during the weekend the amplitude of the signal of the tremor has kept the same average values of the previous days. However, at the 12 hours on Sunday saw a short-lived and weak pulse.

In la mancha in the sea, the Saturday morning it appeared intermittently spots in the area of emission were swept away by the current towards the East, which gave the impression that there were several pockets. However, in the afternoon spot was larger and was detected some time in light of bubbling. The next day, on Sunday, could appreciate the emission of fine material in a small area and a small area of light bubbling. Throughout the day la mancha was extended to the East and Northeast, so that it could be seen from Valverde in a discontinuous way.

Seismic activity

As regards earthquakes, three quakes were recorded during the weekend two on Saturday and one on Sunday, although none of them was felt by the herreña population. The first Quake on Saturday reached 0.9 degrees of magnitude on the Richter scale and was located on the sea in the Gulf area, 15 kilometers deep. Shortly afterwards, at 21: 52 hours, was detected a second movement in the sea, to the West of the municipality of El Pinar, of the same magnitude that the previous and located 14 kilometers deep.

On Sunday the IGN recorded a single seismic movement, at 01: 14 hours, 1.6 degrees of magnitude, located in the sea to the Northwest of the municipality of El Pinar and 21 kilometers deep.

In total, from July 19 11.937 events have been located on the island of El Hierro.

Deformations

The deformation monitoring stations maintained a stable pattern in the horizontal components and a trend toward stability in the vertical throughout the island.

[jand]

Copied from Avcan FB

Buenos dias!! Parece que el tremor ha aumntado en estas últimas horas...

Good morning!! It seems that the tremor has aumntado in the last few hours... (Translated by Bing)

21 minutes ago · Like

[emmi]

aumEntado = increased

[jand]

Thanks Emmi just looked again at the graphs and the tremor is still increasing this morning on the graphs.

[jand]

When were the seven Canary Islands not seven but six, in the recent geological past of the archipelago.
We all know, that the volcanic edifices of the Islands, have been developed from about 25 million years ago, it is the case of the Eastern Islands, up to 1.2 million of El Hierro, the youngest in a continuous process of growth, self-destruction and erosion.
Our islands were surfacing one by one from the ocean floor in processes similar to the underwater volcano of La Restinga, to later emerge from the waters and compose an archipelago which grew from East to West. A process that continues today, as all can see.
Because well, it makes just about twenty thousand years, Lanzarote and Fuerteventura, were to be an island, and not just as a result of geological processes, parted ways, the thing happened because of the tremendous drop in the sea level recorded during the last ice age that made him descend as much as 120 metres under the current level of the coast.
So all hatched Islands were much larger in area, perhaps with the exception of El Hierro which was his most active air growth phase, some 10,000 years ago.
The largest island of Canary proved to be "Mahan", as her he has baptized Francisco García-Talavera into an interesting article that we have found the net and that link as interesting reading from the geological point of view and paleológico.
Interesting to consider whether the eruption of the volcano of the Crown was able to be seen by the early natives on the island. One of which was one of the best-known volcanic tubes in the world; the Cueva de los Verdes, Los Jameos del Agua and the tunnel of Atlantis, now submerged in the sea whose greatest point depth is 64 metres, could be, that at that level was the sea during the eruption. (In reality these three natural wonders are the same volcanic tube)
It is not intended to ours, the entry in the discussion of whether the first inhabitants of the Canary Islands back or not, times as far away as the immediate post-glacial, due to the greater proximity of the African coast to "Mahan" issue that would naturally lead to an interesting debate, but in other forums.
It is our intention, the show how the apparent immutability of the things that pass over a lifetime, is not such to a nature in constant change and evolution.
The tempo of nature is not our tempo.
(JR)
http://elguanche.net/vecinacostaafricana.htm

[jand]

Photo taken yesterday by the civil guard helicopter.

[jand]

Photo taken today.

[jand]

The harmonic tremors have really picked up again all day today.

[jand]

Update 28/12 – 08:05 UTC
 - 1 hour later it looks like we had a vent collapse as the tremor is getting gradually back again




Harmonic tremor in between 07:00 and 07:38 - image courtesy IGN

Update 28/12 – 07:05 UTC
 - After some really turbulent harmonic tremor in between 05:00 and 06:00, harmonic tremor came almost to a halt. We do think that the eruption subsided a lot the last several days but that the current decrease has to be linked to a vent collapse. If this is the case the harmonic tremor will gradually pick up gain as the magma finds his way out.
 


Harmonic tremor in between 05:00 and 06

[jand]

The graphs for today are showing some very strange movements?

[jand]

Jonfr.com/volcano

Someone has posted that the drumbeats have started again and this time there are no ships or boats in the vicinity of El Hierro that can be causing them this time ?

Lurking says:

 December 28, 2011 at 08:11

Uh... ya might want to look at the spectral for El Hiero. I think Bob is having spasms.

http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2011-12-28&ver=s&estacion=CHIE&Anio=2011&Mes=12&Dia=28&tipo=1

Reply

Son de Bueu says:

 December 28, 2011 at 08:55

Spams and now, without a oceanographic vessel, drumbeats..
 http://www.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2011-12-28_07-08&estacion=CHIE&Anio=2011&Mes=12&Dia=28&tipo=2&hora=07-08

[jand]

Note 401 AVCAN - earthquake activity - VOLCANIC - island of HIERRO - 28 December 2011-10: 30 h peninsula - earthquake and volcanic activity is continuing moderate Seismicity in the Gulf and mar de las Calmas and any event detected weak. Continues the important sign of volcanic tremor in the area of la Restinga, which remained strong until between 5: 00 and 6: 00 of the madrugaga has been to give a stronger hidromagmaticas explosions, 3 or 4, by interaction with water, which have due change the morphology of the output of the duct or opening another mouth, clearing it completely, and making it flow smoothlya fact that he has caused the downfall of the tremor. After an hour with the tremor bass, has been again to give small explosions cyclical, known as Drumbeats... These if is... with very short bursts in an interval of time (as of half a minute or so). As regards earthquakes, magnitude has been between 1.8 and 0.8. New earthquakes 3. Depth to 9, 12 and 21 km. yesterday 1. Yesterday 2. Today will be 1. In total van 11950 earthquakes located in El Hierro by IGN from 9: 00 pm of the day 19 July 2011.