General Volcanic Activity Thread!

[The PIT]

I've just seen a trailer on the Beeb for a forthcoming four-part series "Volcano - Live" (9-12 July) with Iain Stewart and Kate Humble, coming from Kilauea. So that's two excitable presenters, rather than one!

Got to keep an eye for that one. Thank you for mentioning.

[Flipflop]

El Hierro waking up again. http://www.ign.es/ig...gia/HIERRO.html

Evento Fecha Hora(GMT)* Latitud Longitud Prof.

(km) Int. Máx. Mag. Tipo Mag. (**) Localización Info 1150860 25/06/2012 09:03:44 27.7056 -18.0741 19 Sentido 3.8 mbLg SW FRONTERA.IHI [+]

Edited June 25, 2012 by Del Trott

[john pike]

hi del

something to watch at el-hierro as you said

http://www.avcan.org/?m=Noticias&a=noticia&N=890&l=en

70 quakes today in the local area and between 18 to 20 km deep

http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

keep an eye on this

very good updated info

need to refresh when you click onto it

[Flipflop]

Hi John

Thank you for the links, iv been following this one for some time now and found it very interesting and entertaining.

I hope they turn back on the web cams in La Restinga soon.

[john pike]

http://www.avcan.org/?m=Noticias&a=noticia&N=890&l=en

163 quakes now

the webcams were turned off due to cost

apparently

[The PIT]

Typical I look the other way and it twitches again. If does erupt again perhaps this time we will get an new island.

[john pike]

hi pit

most of the earthquakes are on land and not as previously

out at sea.

http://hisz.rsoe.hu/..._map&rid=255679

http://hisz.rsoe.hu/...last&rid=255679

this probably puts the main volcano on watch

http://www.volcano.s...m?vnum=1803-02-

another one like katla that likes to tease us now and then

Edited June 25, 2012 by john pike

[Flipflop]

Still plenty of earthquakes this morning under El Hierro.

[john pike]

http://www.avcan.org/?m=Noticias&a=noticia&N=890&l=en

241 yesterday

151 at 17.40

[john pike]

Shiveluch eruption continues

http://english.ruvr....06_26/79308079/

list of quakes

http://earthquake.us.../160_55_eqs.php

Edited June 26, 2012 by john pike

[karyo]

Shiveluch eruption continues

http://english.ruvr....06_26/79308079/

list of quakes

http://earthquake.us.../160_55_eqs.php

Those earthquakes are quite strong! Especially compared to Katla and El Hierro.

Karyo

[The PIT]

Activity has really picked up at El-Hierro. Has Magma found a new path towards the surface? http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

Going to be the one to watch apart from Shiveluch which is the big daddy..

[john pike]

While the unusually strong earthquake swarm under El Hierro Island continues, harmonic volcanic tremor has reappeared short time ago at about 16h10 UTC. The tremor, a low-frequency ground vibration, is thought to be caused by moving magma. It had been strong yesterday and correlated well with a southward propagation of earthquake locations, suggesting that magma at about 20 km depth flew from underneath the El Golfo area towards the EL Julan (south) coast, in a similar way as before the Oct 2011 eruption, but became blocked there, and did not reach the southern rift zone near La Restinga. After the cease of tremor in the afternoon, earthquakes still continued at high rate, marking a record figure with over 180 quakes larger than M2 yesterday alone, and more than 150 quakes larger than M1.5 so far today. In other words, pressure continued to cause wide-spread rock fracturing underground and cause small intrusions of fluids. Now, the re-appearance of tremor could mean that magma is moving again somewhere underneath the island. Where to and whether or not it might reach the surface and initiate a new eruption is difficult to know at the moment. It is essential to continue to monitor location and magnitude of earthquakes.

http://hisz.rsoe.hu/alertmap/site/?pageid=event_update_read&edis_id=VA-20120625-35556-SPI&uid=12685

rsoe update

as you said before pit

could be moving towards last eruption site

will a new island be formed?

[john pike]

Shiveluch has had over 60 large explosive eruptions during the past 10,000 years.

http://www.volcanodiscovery.com/shiveluch.html

9km wide is fairly big

http://www.es.ucsc.edu/~brodsky/reprints/brodsky/trigger_volcano_review.pdf

fascinating piece regarding big earthquakes affecting volcanoes

worth a read

[john pike]

http://www.emsc-csem.org/Earthquake/earthquake.php?id=275572#summary

M 4.0 - CANARY ISLANDS

http://www.emsc-csem.org/Earthquake/

big list today

http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

http://www.avcan.org/?m=Noticias&a=noticia&N=890&l=en

Edited June 27, 2012 by john pike

[The PIT]

El-hierro is still shaking and there has been major uplift and spreading of the island. 3 to 4cm horizontal and 4 - 5cm vertical. Details here http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

[john pike]

worth reading re el-hierro

rsoe update

Following days of almost continual earthquakes, residents of the small Canary island of El Hierro are once again living in fear of a volcanic eruption as their island begins to lift. According to the National Geographic Institute of Spain, increases in seismic activity on the island has seen literally hundreds of earthquakes, known as a swarm, shaking the island and gradually increasing in strength since June 25. Around 750 earthquakes have been recorded although few have been strong enough to be felt by the residents until the last two days The island has been placed on yellow alert by the security committee in charge of operations as the earthquakes increase. The largest so far was registered at 4.0 on the Richter scale on Wednesday June 27. More frightening for the approximately 10,000 residents is the fact that a bulge has developed in the island, lifting it five centimetres in four days. Whereas the volcanic activity of 2011 was based out at sea, this time the magma appears to be forming right underneath the island and the pressure is building. Scientists on the island are using the position of the earthquake epicentres to try and work out where the magma from the volcano will come to the surface.The longer it takes to find a vent, the more the pressure from the magma will grow and the larger any possible eruption is likely to be.

Earthquake Report says that PEVOLCA (Civil Protection from Volcanic Risk) has said that there is an acceleration in the flow of magma, with a "clear process of inflation". As reported by Digital Journal on June 25, the island suffered serious seismic activity last year, resulting in an undersea volcanic cone as can be seen in the video. However, over time, the activity died down and it was thought by experts that was the end of the event. The research vessel 'Hesperides' which had been investigating went home and the live cameras were turned off. Now the 'Hesperides' is hurrying back to the island but the cameras have not as yet been turned back on. The website Decoded Science, in an article by Jennifer Young, explains how magma chambers work and how scientists are processing information from volcanoes to learn more about predicting possible eruptions. It is this activity that the scientists on the 'Hesperides', in conjunction with those on the island itself, will be studying in an effort to try and predict if and when the volcano under El Hierro will erupt. Official reports have been few and far between and the Spanish media has concentrated rather more on the football and the economy than the volcano growing under one of Spain's most popular holiday destinations, just as the season gets into full swing.

http://hisz.rsoe.hu/alertmap/site/?pageid=event_update_read&edis_id=VA-20120625-35556-SPI&uid=12695

[john pike]

President Juan Manuel Santos said on his Twitter account that the area around the Nevado del Ruiz, in the central spine of Colombia's Andean mountain range, had been put on red alert and people should leave the area.

http://www.reuters.com/article/2012/07/01/us-colombia-volcano-idUSBRE86001C20120701

[john pike]

http://hisz.rsoe.hu/alertmap/site/index.php?pageid=seism_index&rid=257124

4.2 quake earlier at el hierro 22km deep

http://hisz.rsoe.hu/alertmap/site/index.php?pageid=seism_map&rid=257124

out at sea near last volcano eruption

http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/

[john pike]

Important Update 02/07 – 23:16 UTC

- The people from El Hierro will have a bad night sleep mostly based on what to come next ? The latest series of earthquakes are even stronger than earlier today. The latest one being a very strong M4.4 at 19 km depth here (please be aware that these are preliminary data who can be changed after manual intervention).

- We are arriving at Magnitudes were the international agencies like Geofon and USGS will capture the signal and report about it.

- Based on our experience with earthquakes and the type of earthquakes El Hierro is suffering, we do not think that damage will be inflicted (not even slight damage) at less than M5. The biggest danger for El Hierro are the possible landslides due to the strong shocks. We would not be surprised that Pevolca will take safety measures for people living near the Sabinosa cliffs if the strong earthquakes do continue for a while.

- It is a certainty now that this activity is far from over

http://earthquake-re...ased-to-yellow/

http://hisz.rsoe.hu/...ndex&rid=257436

The renewed seismic activity process on the island of El Hierro since the 24th of June (2012) has now deformed the island by up to 6 centimetres horizontally and up to 7.5 centimetres vertically, according to data transferred by the IGN to the direction of Civil Protection Plan Volcanic Risk (Pevolca).

http://www.canariesn...d-of-el-hierro/

http://www.canariesn...d-of-el-hierro/

http://www.avcan.org...s&a=mapa&mf=860

keeping eye on depths of these quakes

down to 18-19km now

http://www.02.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2012-07-02&ver=s&estacion=CHIE&Anio=2012&Mes=07&Dia=02&tipo=1

Edited July 3, 2012 by john pike

[tinybill]

looks like EL heirro is playing up again!!

LA VIBRACIÓN PERCIBIDA POR LA POBLACIÓN DE EL HIERRO LA PASADA NOCHE SE DEBE A UNA SUCESIÓN DE TERREMOTOS

03-07-2012 ... 14:52 - Consejería de Economía, Hacienda y Seguridad

...

New note (Henry) PEVOLCA press the vibration PERCEIVED by the population of the iron the last night you should to A succession of earthquakes 03-07-2012... 2010 - Ministry of economy, finance and security light stays yellow for informing the population in the same area the Working Group of the Scientific Committee reported after his meeting this morning, the vibration felt by the population during the last night due to the succession of chained earthquakes. It has also confirmed that the center of pressure of the magmatic process follows 20 kilometers deep South of El Julan, in the Mar de las Calmas. The Working Group, which involved scientists from the IGN, CSIC and the University of La Laguna, has concluded are expected higher magnitude earthquakes in the next week. This situation does not change in the light of information to the population, which is in yellow for the zone outlined last week, but yes insists on recalling the measures of self-protection in case of earthquakes. In this sense the Cabildo de El Hierro has resumed its formative and informative task as it evolved in the upstream of the eruptive phenomenon of last year. Also on the island is already shifted position of advanced remote control (WFP), technical and personal group of emergency and rescue of the Directorate General of security emergency, to assist in strengthening operational coordination and communications tasks. As already reported this morning, the seismic activity associated with the active magmatic process affecting the island of El Hierro has intensified and shows a lower growth rate in the deformation. In this sense, the National Geographic Institute reported to the direction of the Plan of Civil protection by volcanic risk (PEVOLCA) on the location of the seismicity during the last 24 hours, has focused on an area less scattered than the previous days, mainly on the coastal area of Orchilla, West of El Julan and the Mar de Las Calmas. From 21: 40 pm yesterday on 2 July, 03: 00 h of today July 3, the seismicity has accelerated registering a strong episode of remarkable magnitude earthquakes, widely felt by the population. So far, have been located over 1,505 earthquakes, 234 of which are of magnitude greater than 2.7 degrees on the Richter scale. The maximum of this series, 4.4, magnitude has been in yesterday, July 2, at 22: 42 hours, with its epicentre in the sea off the coast of Orchilla, 19 kilometers of depth and a maximum current of IV EMS. The depth of these earthquakes continues to hold around 20 km (between 17 and 21 km). No superficial earthquake has not been registered in the last hours. On the released seismic energy, IGN noted that in the last 24 hours he has experienced a strong increase, reaching a total aggregate value of 1.4x10 Joules (12). Instead, stations of the GPS network, and up to 24 hours of yesterday, continue to show a lower speed of growth in the horizontal components and stabilization or slight change of trend in the majority of the vertical, marking an apparent Center of pressure in the Mar de las Calmas. The total cumulative displacement from the June 24 and up to 24 hours of yesterday, finally is about 7 centimeters in the horizontal components and the vertical, a maximum of 9 centimetres deformation, stresses the report by IGN, the values of temperature, CO2, and radon galleries in the North of the island, where the geochemical continuously recording stations are locatedthey are normal and not shown any significant change since the beginning of the activity. It is useful to recall the measures of self-protection in case of earthquake: If you are in the interior of a building is important: ** do not leave the building until the end of the movement. ** Seek refuge under strong structures. ** Keep away from Windows, glass Windows, showcases, walls and objects that may fall out and hit you. ** Not to be in the kitchen. ** Do not use the elevator. ** If the movement is strong, once completed, turn off the supply of electricity, water and gas. In a public building (supermarket, cinema, library, etc): ** do not run terrified towards the exit. ** Move away from Windows or glass doors. ** Protect under strong structures. ** In spaces with shelves (libraries, archives, supermarkets, etc.) out of the corridors where the shelves and stooping, kneeling, j lard to the sides of the shelves. ** At the school do that children and students kneel under his desk, putting a book on the head ** if the blast surprised abroad ** keep calm and others to save it. Try to control any situation of panic. ** Go to an open area, once away from the damaged buildings. ** If any damaged buildings, do not enter them ** if it is flowing in the car slowly stop the vehicle, procures you do not block the road. Turn on the radio to know authorities the situation and recommendations in particular by road blockages. ** The authorities indicate protective measures to take through the media, information centres and centres of affiliation and registration. PEVOLCA press conference http://www.gobcan.es/noticias

Important Update 02/07 – 23:16 UTC

- The people from El Hierro will have a bad night sleep mostly based on what to come next ? The latest series of earthquakes are even stronger than earlier today. The latest one being a very strong M4.4 at 19 km depth here (please be aware that these are preliminary data who can be changed after manual intervention).

- We are arriving at Magnitudes were the international agencies like Geofon and USGS will capture the signal and report about it.

- Based on our experience with earthquakes and the type of earthquakes El Hierro is suffering, we do not think that damage will be inflicted (not even slight damage) at less than M5. The biggest danger for El Hierro are the possible landslides due to the strong shocks. We would not be surprised that Pevolca will take safety measures for people living near the Sabinosa cliffs if the strong earthquakes do continue for a while.

- It is a certainty now that this activity is far from over

http://earthquake-re...ased-to-yellow/

http://hisz.rsoe.hu/...ndex&rid=257436

The renewed seismic activity process on the island of El Hierro since the 24th of June (2012) has now deformed the island by up to 6 centimetres horizontally and up to 7.5 centimetres vertically, according to data transferred by the IGN to the direction of Civil Protection Plan Volcanic Risk (Pevolca).

http://www.canariesn...d-of-el-hierro/

http://www.canariesn...d-of-el-hierro/

http://www.avcan.org...s&a=mapa&mf=860

keeping eye on depths of these quakes

down to 18-19km now

http://www.02.ign.es...7&Dia=02&tipo=1

[The PIT]

Sure takes it time to reach the surface. Still no definite move upwards as of yet but it must only be a question of time. Of course magma may remain under the surface if the injection of new material stops so it's a case of keeping watch.

[john pike]

Very important Update 03/07 – 23:55 UTC

A report from the GSC (Communication department of Canary Islands) has revealed that a helicopter survey unit has noticed a (small) jacuzzi and a white stain at coordinates 27º 4.573†N y 18º03.761†W in the Las Calmas sea approx. 180 meter out of the coast. The images which have been taken by the helicopter will now be analyzed by the IGN scientists. A new flight above the zone is planned for tomorrow.

Jon Frimann (Icelandic volcanoes blog) writes an interesting comment which we share : Dike intrusions can happen with and without harmonic tremor. Dike intrusions with harmonic tremor happens mostly at places where conduct is well established. That is not the case now. So I would not trust any signs for harmonic tremors just yet. Harmonic tremor pulse might be seen few hours before the eruption starts. Given my experience and what I did see during Eyjafjallajökull volcano eruption in the year 2010. Given the amount of earthquake activity. I am assuming that some of the magma has reached less depth in the crust without making many earthquakes at present time. The reason for that is magma has easier time to make the rock soft at less depth. Soft rock means few to no earthquakes. How this plays out is all big question that currently nobody has an answer to at the moment. (Thanks to Ian Carson for informing us)

- Below another picture of the detected stain and small jacuzzi (the picture above in natural colors – in the picture below we have increased contrast and sunlight) (All pictures courtesy GES)

http://earthquake-re...ased-to-yellow/

info from earthquake report as per link above

Edited July 4, 2012 by john pike

[The PIT]

False alarm over a new vent. Confirmed as just local currents so local fisherman called it correctly. The depth also made it unlikely that magma was erupting. The deformation on the island continues.

[john pike]

Anak Krakatau volcano (Indonesia), activity update: lava dome has disappeared, new hydrothermal vents

http://www.volcanodiscovery.com/krakatau/news/10294/Anak-Krakatau-volcano-Indonesia-activity-update-lava-dome-has-disappeared-new-hydrothermal-vents.html