Saturday, November 26, 2011

El Hierro updates November 26 2011

Update 26/11 – 12:42
The best you can do at the moment is staring at our webcam. For minutes in a row, we have seen periods of smoking magma. The smoking magma was first seen by reader Hans-Werner who also captured the image on his screen. Hans-Werner has told us also that the webcam was operated in the right direction when it happened. This is also great news to hear as the webcam operators seem to have learned from past critics.
Screenshot courtesy Birgit Hartinger
Telefonica eruption webcam activity of smoking lave on November 26 2011 - image captured by Hans-Werner Jouy
Update 26/11 – 11:30
Joke reports that her friend, the La Restinga human webcam, has growing fear that a new evacuation is not far away as the stain is very visible from the village this morning (Ian reported the same in his 09:52 update). She thinks that if the wind eventually changes, La Restinga might be in the center of the storm again.
Update 26/11 – 11:28
- The volcanic earthquakes have picked up their daily work again. Since 09:21 this morning 4 M+1.5 earthquakes have been listed by IGN, the strongest one being a M 2.7 earthquake NW of Frontera
Update 26/11 – 09:52  – Ian Carson reports :
A lot of stain right to coast at La Restinga but no emission points can be seen by me. I don't think the earlier mention of a closer one was true. Harmonic calm.
Update 26/11 – 09:43
- 3 earthquakes have occurred since midnight, all of them less than 1.5, the reason why these quakes are not listed in the IGN main list.  2 of these quakes had a depth of 14.8 km
- while looking at the webcam for a longer period a lot of mysteries are showing up. Here are a few of them :
- why can toppling waves almost only be spotted in the stain waters ?
- why do we have sudden color change in parts of the stain ?
Update 26/11 – 09:05
- the beautiful calm Las Calmas sea enables us this morning to trace the eruption vent. The arrow on the picture below is the location were we expect that the vent is (probably) degassing. About 15 to 30 minutes ago, we have spotted here the source of a white stain.  Unfortunetely the Telefonica operators have since zoomed more to the left .  The Telefonica operators have since zoomed the image and probable stirring action has to be located at the upper right corner.
Eruption webcam image - Location of the suspected source of todays stain
Update 26/11 – 08:51
- Joke reports that she sees a stain from El Pinar (El Pinar is approx. 10 km from La Restinga) and is located on the mountain itself.  She also reports that she cannot find any turbulence in the sea
- Ian reports more or less the same
Data Update 26/11 – 08:02
- NO earthquakes to report since midnight UTC
- VERY STRONG colored stain can be seen on the webcam, even with poor daylight
- NO Jacuzzi seen so far
- Both phenomena are linked with each other. The degassing / eruption is continuing and creates big stains since a couple of days. By taking away the pressure from the reservoir in the El Golfo area the earthquakes are almost halted
- Harmonic tremor is still going on and accordingly it is far too soon to conclude that the eruption is over like some people are declaring at the moment.
Update 26/11 – 01:10
- We have cut 2 parts from this too long article.
Part 13 covers the period from 16 to 19 November
Part 14 gives all the details from the October 20 tot October 23 period.

Data Update 25/11 – 13:32
- medium harmonic tremor with some occasional bursts (more or less the same than the preceding days)
- 9 earthquakes greater than M 1.5 today
- depth in between 17 and 21 km
- Only 1 earthquake was felt by the Herreños (3.1 magnitude).
Ian Carson reports from El Hierro :
I was sure today that the point of emission had changed from yesterday. Sitting in the same position with my feet in the same 'ash holes', today's emission point was further to the right. I have tried to demonstrate this in the attached photo, using a line I put down yesterday to mark the point.  Joke has kindly put the two photos together. Click on the images to see some more pictures from Ian Carson from today.
Photos of activity on Mt Colorada Cone (176m) and directly in line with vent and Puerto de Naos cone. I read before I came that they were monitoring former significant volcanoes. Look for man in cone on photo without the helicopter. Click on the images to see some more pictures from Ian Carson from today.

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