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El Hierro

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jand

#4080
December 31, 2013, 16:06:37 PM
Translated.

,,Santa Cruz de Tenerife, 31 Dec (EFE).-El Hierro ends the year as he began it, with a seismic rebound this time has raised the island 8.3 centimeters in eight days and that is the important fifth since the earthquake that preceded the eruption of an underwater volcano in the South of the island began in July 2011.

Scientists consider that since December 22 the island may be living a new episode of magmatic intrusion, linked to the same volcanic process that has generated deformations, in both the horizontal and vertical, very quick and significant components and surface seismic activity.

Although the eruption of La Restinga is terminated in March 2012, the volcanic process that was associated with has not finished and, according to scientists involved in the Plan of Civil protection by volcanic risk in the Autonomous community of the Canary Islands  (Pevolca), it is expected to last months or years, and to become to produce new intrusion of magma beneath the island.

The inhabitants of El Hierro live with relative ease this process, but the earthquake  suffered last Friday, a magnitude of 5.1 degrees on the Richter scale - the largest of the more than 21,000 registered since the beginning of this earthquake-volcanic crisis - broke the calm of the southern-most of the Canary Islands.

The tremor was felt in the four islands that make up the province of Santa Cruz de Tenerife, but despite its magnitude, did not cause any personal injury or in private property and only there were some landslides that caused the closure of two highways and a viewpoint.

From that shock, seismic movements have become calm, according to the information of the National Geographic Institute, Saturday were eight minor earthquakes, though one felt by the population and only Sunday one.

The majority of earthquakes are located west of the municipality of border, but this time the national geographical Institute clarifies that it has no evidence that related these movements, including that of 5.1 degrees, with a new process of magma intrusion in that area of the island.

IGN noted that Yes this series of earthquakes are occurring in the same area in which the intense revival that took place last March was located and in his opinion, the existence of pre-existing fractures and the almost continuous accumulation of deformations on the island may be linked to this activity, although it does not rule out a more regional scale source.

For its part, the volcanological Institute de Canarias (Involcan), which has a permanent geochemical network on the island, detected the existence of "relatively unusual" emissions of radon gas days before the start of this seismic turnaround and attributed these emissions to changes in efforts in the crust of the island.

This organism scientific, dependent on the Cabildo de Tenerife, has also reported that eight days abnormal displacement on the island, have occurred in both horizontal and vertical, in an imperceptible process for the population, but which is recorded at monitoring stations by gps (at the rally in March, the island led to soar more than 11 cm).

For the Involcan, that deformation of the terrain, coupled with other parameters, confirms that the process of magma reactivation in the island continues after almost 22 months to terminate the underwater eruption that occurred off the coast of La Restinga. ,,

http://noticias.lainformacion.com/catastrofes-y-accidentes/erupcion-volcanica/el-hierro-cambia-de-ano-otra-vez-pendiente-del-sismografo_W6BaxtCvRb46lJEBNl2Ez2/


jand

#4081
January 01, 2014, 10:35:46 AM
Courtesy of Enrique from Avcan.

Translated.

..008. The year is dismisses with an earthquake in the area of the volcano of LA RESTINGA - follow-up of the today VOLCANIC and seismic in the island of EL HIERRO - map updated 01/01/2014 - 10:00 h. Canary Islands. Last year ended with 11 earthquakes mainly aligned according to a direction NW - is one of antesdeayer. The last of earthquakes yesterday has been 2.1 magnitude 3.4 km depth in the area where it erupted to the calm volcano. Deformation of the GPS stations remains more or less, or UPS, or low in general terms, but some stations rises slightly, and others down slightly, in beginning small movements, something more substantial in the horizontal, where it follows the movement. Therefore continuous volcanic activity although the seismic is not so appreciable, seems that loosens these days, it is necessary to try to see if it loosens definitely or returns to pick up, we shall see, currently there are no earthquakes today that have premiered the present year, happy new 2014 year..

http://www.avcan.org/?m=Mapas&a=mapa&mf=6785

jand

#4082
January 01, 2014, 14:52:49 PM
Courtesey of earthquake-report.com.

,,2014-01-01 13:23 UTC
Renewed increasing tremor is visible in the El Golfo area (TAB en TAN seismographs). Remember that we mentioned this morning  that HI04 Sabinosa area GPS station had an increase of at least 2 cm during the last 24 hours.,,

jand

#4084
January 01, 2014, 20:55:42 PM
Translated.

Prognosis of possible increase in activity between December 31 and January 5, 2014

,,Canary Islands volcanoes has made a compilation of views between different scientific teams that monitor the volcanic activity of the island of El Hierro. One of the predictions that are shuffled, with existing data to day of today 31.12.2013 to 13.00 h, is the probability of that occurring,  between the night of December 31 and January 5, 2014,  a sudden increase in seismic activity with the possibility even of evolution towards an eruptive process on the island or in its vicinity.

As it is known on December 22 was a strong acceleration of volcanic activity on the island of El Hierro, and as explained, "this cycle not is behaving exactly the same as the previous ones, in which there was a progressive increase in the magnitude of seismic events (earthquakes). In this case, it passed low magnitude event one 5.1 which caused serious damage in some parts of the island".

Also added that "now is very uncertain, but, because of the behavior shown by deformation in the last days, some researchers believe that the coming days could take place a sudden increase of seismicity or the possibility that the system may evolve toward a rash." Starting tonight and until 5 January will have to be very attentive to this situation".

Recommendations

Volcanoes of Canary Islands is recommended to take a series of measures that we have been recalling in recent days:

- Avoid the roads where it is frequent landslides occur (currently some are cut to traffic). It is also recommended to check the condition of the houses, looking especially for fractures and cracks that were not previously and that might point to a structural failure (  http://www.preventionweb.net/files/7661_ManualdecasasdemamposteriaAISredpart2.pdf )).

-Check the furniture of the House, in anticipation that some earthquake can be pulled to the ground porcelain, books, etc. There are numerous recommendations in case of earthquake, please keep in mind the major protective measures and practice them as a game, with the children. Recommendations earthquakes

-Remember that citizenship should be attentive to the releases of theDirectorate-General for security and emergencies of the Canarian Government or local authorities of the island of El Hierro.

Volcanoes of Canary does with this information generate fear-mongering in the population, only inform one of the predictions that are shuffled in the absence of official information. The aim is also that the citizenship of the iron remains an attitude consistent with this possibility and avoid, to the extent possible, situations of risk in the coming days. All hope and wish that this situation returns to normal soon and the three kings arrive happily at destination.,

http://www.volcanesdecanarias.com/index.php?option=com_content&view=article&id=318:pronostico-el-hierro-31-de-diciembre-05-enero-2014&catid=118&Itemid=122&lang=es


jand

#4085
January 03, 2014, 10:15:07 AM
El Hierro is still inflating.

Courtesy of Enrique from Avcan.

..Newly updated we have the graph of the IGN with deformation data obtained through GPS by the IGN until yesterday in some of the stations. Deformation continues active, and it seems that the turning point that we see in the graphs and that seemed to begin a downward trend of this was no more than fruit of the release of stress accumulated by the earthquake registered last December 27 with magnitude 5.1..

..Warp back up, we will see if it is a upward trend or a timely rebound, if it is the first thing, the seismicity not took to appear on the island, but if it is the latter, tomorrow will descend... now only can wait and see what happens. (Enrique)..

jand

#4086
January 03, 2014, 20:51:20 PM Last Edit: January 03, 2014, 20:57:23 PM by jand
So much is being talked about all over the internet about El Hierro from all over the world.

Have just seen this comment by Carl from www.volcanocafe-wordpress.com.

,,I just checked through AVCAN after getting told that they are saying that we do not care about the people on El Hierro.
Nothing could be more wrong, we worry about the people on El Hierro all the time. And we are appalled of the lack of information they get, and we are even more appalled that people believe that we do not care.

On the other hand, one could do plots like this that either hides the truth, or is just severely flawed in its methodology, so much so that it is hiding the truth of what is happening.

In it they inverted the GPS-data without inverting the map-coordinates. That will deftly move the center of attention to a "safe" place out in the ocean instead of placing it under El Pinar where it is.
Also, I guess it looks better if people believe that the magma reservoir under El Pinar is shrinking. I do not think this is a good example of taking care of the residents of El Hierro, hiding things with deft data-manipulation is instead a rather horrible thing to do. Shame..

This morning Avcan posted a map that showed that the island had stopped inflating which was totally incorrect and they have since amended the map to show the correct inflation and they have apologised for their error.

http://i40.tinypic.com/10hoeow.jpg

..FAITH of errata: On map of deformation that I showed them this morning, there was an error. Deformation vectors were inverted with respect to reality, since the software we had used was taking as a geometric criterion (rather than geographical) the angle of the vector. Thanks to our intrepid readers, we have fixed the map (and I take this as an author to apologize and thank your quick comments) and colored arrows according to the amount of deformation as per one of the suggestions that had been over the previous version, making a completely new version. Remember that the arrows indicate the direction of deformation in the horizontal plane, its length and color the amount of deformation (in mm.) on that plane, and the number that is in the upper right corner of each arrow indicates the extent of the deformation in vertical, i.e., in the heights, and is also expressed in mm. (Nahum Méndez Chazarra)..

https://scontent-a-lhr.xx.fbcdn.net/hphotos-prn1/1560567_10152152302873447_1185611199_n.jpg

jand

#4087
January 03, 2014, 21:00:56 PM
Earthquakereport.com have posted that the South east of the island is uplifting again.

..2014-01-03 13:25 UTC
A stabilized picture at the western and northern part of the island. The South-east however is lifting again. Check increase at HI08 and HI09
Link to graph of HI00; HI08, HI09 and HI10
Link to graph of HI01, FRON, HI02, HI03 and HI04..

jand

#4088
January 04, 2014, 20:47:12 PM
Translated


,,Volcanic actualidad de Canarias (AVCAN) suggests the need for a thorough technical inspection of damage caused by the earthquake of 5.1 degrees registered on December 27, 2013, on the island of El Hierro as well as the follow-up of the evolution of the cracks and fissures detected in Los Bascos, through the placement of witnesses or the installation of instruments appropriate GPS.



Tenerife  - 04/01/2014. After the last rains registered in El Hierro and the even more recent seismic activity and culminating in a quake of 5.1 degrees last Friday, December 27, 2013, the cliffs, so  abundant in the Meridian Island, have been weakened.

After the earthquake mentioned, we are witnessing a profusion of landslides which, although fortunately caused no victims, affected the island roads reaching thirty person remain incommunicado by the Verodal area. Rear eye inspections are alerting us that those landslides been  may be the announcement that more importantly may occur in a few cliffs, already if unstable by its own lithological composition and tectonic and topographic position.

In this Visual inspection it has been established the existence of fissures, so far nonexistent, which seem to indicate possible rotational character landslide processes. In the pictures that accompany this text, taken on the morning of Friday, January 3, 2014 by a contributor to AVCAN, these concave cracks be seen in the upper part of the slope of the cliff, which they seem to be progressing in depth resulting in the generation of a slip plane. If this is so, we would run the risk that sectors of the risco moving downhill with a simple precipitation or a seismic rebound.

Therefore and to prevent hazards becoming risks, it would be necessary that by competent technicians is appropriate to carry out a thorough inspection of mentioned cracks and fissures, and where there is the slightest danger, is appropriate to the closed top and bottom of the leg of the affected Cliff area. These same technicians could assess also If it is advisable to keep track of the evolution of the cracks and fissures detected in Los Bascos, through the placement of witnesses or the installation of instruments appropriate GPS.

http://www.avcan.org/varios/Imagenes/bascos01b.jpg


http://www.avcan.org/varios/Imagenes/bascos02.jpg

http://www.avcan.org/varios/Imagenes/bascos03.jpg

http://www.avcan.org/varios/Imagenes/grietas06.jpg

The volcanic Canary Islands (AVCAN) news team,,

jand

#4089
January 05, 2014, 08:24:46 AM
Courtesyof Enrique Avcan.

,,009 New earthquake consciousness, appearance of cracks and more - follow-up of the today VOLCANIC and seismic in the island of EL HIERRO - map updated 04/01/2014 - 23:00 h. Canary Islands. Today has been an earthquake of 2.8 to the southeast of the island of El Hierro that has been felt by the population, followed by another more in the same area in an area between 9 and 10 km deep and forming a small swarm, and possibly indicating that this process of continuous intrusion of magma, thing that it can be confirmed in coming hours, because there will be more seismicity and deformation. And by the way, speaking of deformation, information that I receive anyone indifferent, as it is the break of a pool or reservoir for irrigation in the area of the pine forest as a result of the earthquake of 5.1 (data from IGN with a single station, we'll see when reviewed it and added the rest of stations) or 5.4 (USGS and EMSC) also I have received information about the appearance of cracks as the previous post and also in some houses of some towns of the island, such as Sabinosa, Frontera and Isora. Please if they suffer this kind of things, it is important to report them in the questionnaire macro at the end of this Post, it is very important since they may indicate areas more fragile or why magma to move better and can form a fireplace gas first and an eruptive mouth later. In addition these houses if the cracks are large, may not be safe if it comes another earthquake as the other day. Indeed, I think that the competent authorities are which should have initiated an immediate review of housing, schools, health centers campaign... to avoid personal disasters in the future. I say this because I have several questions:-who will be the / Manager/s if one of these buildings collapses or is affected by a landslide in following tremors that may be on the iron?. .The competent authorities clear this... warned are... -Do you know if the IGN staff have urged authorities to carry out these essential revisions of housing and infrastructure?... I hope that if... but already they are taking, as damages and compensation will have to be borne by those responsible. I just hope that all this relaxes, but seeing the way that earthquake and volcanic activity in the iron, seems rather the opposite, we will see what happens, because at the moment, nobody knows what will happen. (Henry) ,,

http://www.avcan.org/?m=Mapas&a=mapa&mf=6815

jand

#4093
January 07, 2014, 21:03:22 PM
Courtesy of Enrique Avcan.
....010 Monitor current VOLCANIC and seismic in the island of EL HIERRO - map updated 07/01/2014 - 19:45 h. Canary Islands. The continuous deformation at maximum values, and also note in the deformation as if magma moved towards the western part of the island and in the Gulf stations, as shown in deformation, rise a little in the area of HI-04, indicating that the area of the earthquake of 5.1 seems you still receive magma and the problem is to pressurize, with what the seismic will revive again.

Also in some areas of the island, they begin to notice things as irritating fumes of eyes, respiratory tract and skin in some areas. the ground movements and vibrations, which seems to indicate that we we have another pulse of gas.

In short, the volcano of the island of El Hierro will gradually but with safe passage, with a deformation climbing each swarm, indicating that the filler material in depth has not ceased in all these years, and to continue so it ended late or early finding the way of the surface. In some areas accumulated deformations of 20-25 cm from the beginning (Enrique)....

http://www.avcan.org/?m=Mapas&a=mapa&mf=6821


.

jand

#4094
January 11, 2014, 18:45:40 PM
Courtesy of Enrique from Avcan. Translated.

..011 Follow-up to the current VOLCANIC and seismic in the island of EL HIERRO - map updated 11/01/2014 - 17:30 h. Canary Islands. The situation is stabilized as to deformation is concerned, after the earthquake of 5.1 and a minimum variation of several sensors, most of them are maximum values. Note that only HI-08 has dropped something these past few days, about 2 cm, but follows the displacement to N westward with almost 1 cm and 1 cm. The IGN is locating less seismic events, however if seen in seismograms and spectrograms, but some still locating today as one magnitude 1.4 in the South, in the sea of the calm near cala Tacorón 16.7 km deep and is a change since the last days almost all were in the West area of the island where the 5.1, as the yesterday's magnitude 2.3 to 12.1 km of depth. The next few days it is unknown that happen in terms of seismic and volcano behavior, but the only thing notable is that magma is still moving as shown in deformation and that the people of the island these last 3 days continues hearing noises in localities as Erese, the pine forest as if a river or Creek and surrounding areas of the border where they are heard as a rolling stones in depthas well as feeling vibrations in tips, Isora, Erese, El Pinar, Los Llanillos, Las toscas, the mocanal, Sabinosa and Tigaday. It all off also have become strangers to sulfur smells, bleach, a hydrocarbon, to rotten and other rare odors, according to that area of the island, and preferably in the area of the Gulf. Also some people notice vibrations these days in various parts of the island of la Palma, in the port of Naos and the Llanos de Aridane, related to the activity of the Hierro Island, since noise often coincide in hours with the earthquakes that occur in El Hierro. (Henry)

http://www.avcan.org/index.php?m=Mapas&a=mapa&mf=5646


today in the South... 1253667 11/01/2014 14:55:59 27.6617 - 18.0366 16.7 1.4 SW EL PINAR.IHI El Hierro yesterday West 1253554 10/01/2014 17:01:23 27.7570 - 18.3251 12.1 2.3 W border.IHI the iron extended in case of feeling an earthquake, vibrations, smells strange, deformations in doors and windows that don't fit or cracks in house, spots in the sea, bubbling, columns of smoke, strange behaviors of animals, noise or whatever, do not hesitate to report it to the questionnaire of the IGN or through the application of AVCAN QUAKE.

c matthews

#4095
January 11, 2014, 22:09:09 PM
hi any web cams working

jand

#4096
January 13, 2014, 19:33:15 PM
Hi

Sorry to say there are no webcams at all , they were all disconnected about a year ago.

CHIE station is not working so all information is now from CTAB station.

Tremor has started again this evening on El Hiero.


http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=Ctab_2014-01-13&ver=s&estacion=Ctab&Anio=2014&Mes=01&Dia=13&tipo=1#

jand

#4098
January 13, 2014, 20:16:57 PM Last Edit: January 14, 2014, 06:40:48 AM by jand
Recently posted on the Avcan Facebook page individual comments by a German Man who has lived/living in the Canary islands.

..esculpa Io ha vive en las canarias por cinquo annos pero non pueodo hablar y escribir espanol bien o perfecto. escribo in Ingles:( coge la traduction function de facebook por traduir en Esopanol) I love the Canaries, But ever again experts declare the volcanic crisis as ended until it starts up again one day after. Its the continental(westwards) drift that makes me believe that the real Canary hotspot is actually most likely near/ Southwest of El Hierro, La Restinga. This is why all new volcanic activities start with some quakes and tremors there and why they heap up the island. Today, when I write this,tremor activity near El Hierroi seems to have come to a still stand, but there is a constant minimal tremor in all seismographs on the most of the 7 island,All islands have at least functionable seismographs- exept Tenerife. the seismograph there is - since Dec 11- now more than one month " fuerra de servicio" ( its still writes but received a damage likely by recent solar storms) allthough the strongest tremor signals had been measured there and T is the only island that shows still magmatic tremors asls today , as far as what the seimsographs there still "writes" can be read at all. MODVOLC hot spot survey ( makes infrared pictures of the Earth`s surface to see where there is any magmatic activity) shows the entire North of Tenerife red(, while there is only minimal red colorisation on the peaks of La Gomera ( Garajonay)a and la Palma and none on the other islands and none on El Hierro itself . I would not panik at the moment, but how do you want to" control the situation" ( this was the statement) if your seismograph on tenerife is " fuerra de servicio" ?Is this part of the " saving " money program urged by the EU? thanks for re reading this" Have a good volcano awakening at anytime either noe or later! Hastaluego en las Canarias! Helmut Munich Germany..

jand

#4100
January 15, 2014, 20:26:07 PM
Courtesy of Avcan Enrique. Translted.

,,012 Follow-up to the current VOLCANIC and seismic in the island of EL HIERRO - map updated 15/01/2014 - 15:00 h. Canary Islands. Activity continues, and some neighbors (others not, only some sites more likely to feel these things) from various locations on the island of El Hierro still felt vibrations, tremors when earthquakes and some noises, as well as bursts of smells.

In fact the seismogram of CTIG sample a rather obvious noise in the last hours has started at 14:00 o'clock... not yet known is due with a frequency to 4.5Hz and their harmonic to 9 Hz, noticing something to 13.5Hz... and that may be audible as a continuous beeping sound. A possible cause can be noise that makes the cavitation of water pump that has been underway at that time or a generator in the vicinity of the station...
Which are not published details of earthquakes located by the IGN does not indicate that there are no earthquake and volcanic activity, earthquakes are still occurring, the latter located by the IGN yesterday in the Centre of the island of El Hierro.

http://www.ign.es/ign/resources/volcanologia/DATOS/2014/CHIE/imagenes_sismica/HORA_SP/CHIE_2014-01-15_14-15_sp.jpg

IGN GPS deformation stays in the center of the island and Gulf stations presented a slight trend upward, especially those more to the West, indicating the possible transit of magma towards the West of the island to the area where he was the 5.1 of end of the year. He is also observed with a significant displacement of almost 1 cm for all seasons, but that seems an instrumental error, when occurring in the archipelago.

Finally expected a worsening of the State of the sea for the next few days, which will be seen in an increase in noise in the sensors of the archipelago.

http://www.avcan.org/index.php?m=Mapas&a=mapa&mf=5646



jand

#4101
January 16, 2014, 21:15:05 PM
Sounds of El Hierro Harmonic Tremor.

Quejidos del volcán de El Hierro

jand

#4102
January 16, 2014, 21:18:00 PM
Courtesy of Avcan . Translated.

,,a harmonic tremor or signal of long period (LP) is a typically volcanic sound and since Bernard Chouet (engineer become volcanologist), identified it as such, is associated with the passing of magmatic fluids (gases, magma or liquids all pressure) by the conduits of the volcanic system and generate sounds such as those produced by an organ pipe. The frequency and number of occurrence of such events per unit time, can help determine the proximity or remoteness of an eruptive event. Location accurate sources of these signals, is carried out not on the basis of a single seismograph, but the deployment of the so-called seismic or joint arrays of Geophones or seismographs, (special short microphones), which allow to provide the account of the position and evolution of the fluids that generate these particular signals.,,

jand

#4103
January 17, 2014, 08:31:30 AM
Deformation Of El Hierro 16/12/13 - 16/01/14

El Hierro deformation from GPS data 16/12/2013 - 16/01/2014

jand

#4104
January 18, 2014, 05:33:58 AM
 Courtesy Of Avcan.

Translated.

,,AVCAN.ORG team could access exclusively a graphic material relating to the occurrence in today's volcanic material floating in the white sand beach. A source who prefers to remain anonymous has provided us with graphic material on the subject, and we show in the photo gallery you can see below.


The conclusions of the nature of this material corresponds to the enclosed experts in the Scientific Committee, and waiting for their analyses were. Then the photographs...

(The photographs can be viewed on the link below)

http://www.avcan.org/AvcanBlog/?p=804

jand

#4105
January 18, 2014, 08:48:26 AM
A very deep quake at 91km depth.


...1254460 18/01/2014 05:32:28 27.3941 -17.8345 91 1.9 mb SE EL PINAR.IHI


https://scontent-b-lhr.xx.fbcdn.net/hphotos-prn1/t1/s261x260/1535663_1514451012114138_93151917_n.jpg

jand

#4106
January 18, 2014, 19:22:06 PM
Courtesy Of Avcan.

,,Register deep earthquake in the southeast of the island of El Hierro 05:32:28 82 Hours on Saturday, January 18, 2014 the National Geographic Institute (IGN) recorded a seismic movement of 1.9 degrees Southeast of El Pinar (Höfuðskáld. 27.3941 / length. - 17.8345). Highlight of this earthquake occurring according to IGN to 90.7 km deep with a margin of error of 19.5 km. The wide margin of error is justified to occur far from the insular seismic network. Keep in mind that the magnitude of 1.9 offered by IGN, and calculated only with CTIG station, is given in type mb and not in mbLg as it is becoming customary in closest to the island building events. Orientative comment that according to estimates officers AVCAN the magnitude of the event in mbLg wouldn't 2.9 degrees. Likewise, calculations of AVCAN located the event 30.9 km from the beach of La Restinga, 37.7 km of the Town Hall of El Pinar and 31.2 km from IGN CRST seismic station. See all the information of the event in AVCAN.org: http://www.avcan.org/index.php?m=Catalogo&a=detalle&ev=1254460#Lfases We have to be vigilant in case the location of the hypocenter of the earthquake could be related to a new supply of magma to the system. (Fernando Raja) Note.-on the attached map the location of the three recent earthquakes. The farthest and the will of the island is that discussed in the post.,,

https://scontent-b-lhr.xx.fbcdn.net/hphotos-ash3/1512526_10152184544223447_1481974355_n.jpg

jand

#4107
January 19, 2014, 19:56:14 PM
Courtesy of Avcan Enrique . Translated.

..FOLLOW-up of the present VOLCANIC and seismic in the island of EL HIERRO - map updated 15/01/2014 - 15:00 h. Canary Islands. The volcanic earthquake activity is quieter to seeing the latest data located by the IGN in the island of el Hierro, and the inhabitants of the island are still noticing things, like vibrations in some areas, as the town of Las Puntas, Tigaday and Los Llanillos. Today also heard a noise like thunder on 12.30 h in the Gulf area and as the jetliner, but without aircraft... loose and dull area centre of the island, which is the only earthquake located today by the IGN of magnitude 1 to 10 km in the Centre of the islandalmost nothing. Deformation after a day with instrumental errors we had yesterday looking at the reference stations, continues more or less remains the same, with a downward trend. with moves downward, and slightly to the East and South into the Gulf in the HI-02, FRON, Hi-03, HI-04. The HI-05 this without data and the HI-01 this without updating. The HI-08 stays more or less and moves slightly to the N and the West. The HI-00 in Valverde moves slightly to the S and East. Of the HI-09 Restinga is not updated everything and the trend is slightly towards N and O. The HI-10 this without updating..

http://www.avcan.org/?m=Mapas&a=mapa&mf=6825

jand

#4108
January 21, 2014, 21:36:02 PM
Courtesy of Avcan. Translated.

..Improve precision to locate the earthquake that preceded the eruption of the a iron IGN team improving the uncertainty in the location of earthquakes prior to the eruption of 2011 to less than 400 meters. His studies suggest the presence of a 'sill' (a thin layer) of magma, expanding and breaking the bark alternately in two different zones, something rarely observed in the seismicity associated with other volcanoes. SEE the news complete on: http://www.avcan.org/?m=Noticias&a=noticia&N=989 ..

http://www.avcan.org/?m=Noticias&a=noticia&N=989

Part translated.

,,Compact seismic activity and the presence of a 'sill'

The new distribution shows a much more compact seismicity, which begins in the Centre of the island to migrate quickly to the Gulf where he would remain two months at a depth of between 9 and 11 km. In this area there is an alternation of the seismicity in the East and West of the Gulf suggesting the presence of a ' sill' (a thin layer) of magma, expanding and breaking the bark of alternately in two distinct zones, something rarely observed in the seismicity associated with other volcanoes.

"In September there was a migration towards the South and greater depths of between 14 and 16 km, however magma never descends in depth in a way natural. Is for both open the question of the evolution of seismicity in depth which must be another source other than the simple migration of magma", are running the scientists."

Finally, days before the eruption earthquakes approaching the coast and ascend several miles to finish producing shallow earthquakes that occurred 30 hours before the start of the eruption on October 10, 2011.,

jand

#4109
January 21, 2014, 21:39:15 PM
Comments by Enrique Avcan. Translated.

..Finally some information, open the treasure chest very well, that have better definiciony the area of shallow earthquakes conforms to the south Rift, in the area where supposedly the first mouths were opened to greater depth, but is that also note the branch of the fault parallel to the South rift that is born in the Gulf and low to the eruptive area...

But it is clear that something is wrong, I do not think that climb that distance without making any noise, 10 km in vertical and horizontal 6-7, I think that they have to stretch the map to the South in depth so you comply perfectly and that that magma go to more depth still does not fit me.

I think that the root of all this is that you have not touched the map of relative densities of layers of the island which is used for the calculation of the distance of the signal to the sensor according to the differences between the arrival of the waves P and S, and that should reset better to have a more precise location for depths, as well as in the horizontal.

In the phases of each earthquake, you can see the value of the GAP, which shows the relative error for the location of the stations for the triangulation of the earthquakes and can say in General that in the central area of the island information is good with a GAP below 200, and is worse in the areas in which we went out to the seaas the earthquakes of the mar de las Calmas, and to the North in the sea of the Gulf, the error comes up and surpasses this GAP, making that the results are not as accurate and consistent. Once we publish a news which I rescued. As that, this improvement is welcome but they must keep improving, this is a first step in the right direction. (Enrique)..

http://www.avcan.org/?m=Noticias&a=noticia&N=892

(The link above is very interesting will need to be translated.)
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