The volcanic island of El Hierro is really turning into the Little Volcano that Could.
3 earthquakes seem to have changed the ballgame around once more. First came two deep earthquakes at a new spot at 10.10 in the morning, both of them at the depth of 20 km. 26 minutes later followed a 2.6M at 10 kilometers depth.
Within minutes a sharp increase was noticed in the high frequency tremor. The tremor lacks low frequency components making this a dead giveaway that we are seeing a de-gassing event. What has happened is that a persistent earthquake swarm north of Balneario Pozo La Salud most likely finally cracked through and things started to move up beyond the de-gassing threshold.
After the 10.36 earthquake the shallower earthquakes pretty much disappeared and we had an onset of a new active deep earthquake swarm. In retrospect it is clear that we most likely caught the arrival of a new bolus of magma arriving from depth. If so it is the fourth time new magma arrives from the depth.
The deep earthquake swarm roughly follows the same pattern as for the previous 3 arrivals. Activity started at 20 kilometers depth at Tanganasoga, and then moved outwards and slowly dipped deeper. Every arrival has taken a slightly different direction; this one is moving into what can only be seen as pristine territory.
It is still too early to see anything on the GPS, but it should start to be visible tomorrow.
Question then is where is the de-gassing happening? My guess is that the guests of Balneario Pozo La Salud might have an interesting wake up call. If they are lucky they will have a brand new hot water Jacuzzi out in the ocean. For those who do not know, Pozo La Salud is a thermal spring bath in El Hierro.
Friday riddle is still unsolved:
I am the stony product of music that make Pavarotti mate a canis canis sheep mixture, I am spawned out of the apothecary.
What am I? And what is my origin? 3 points to be had, 2 for the name of “What am I”, and 1 for the origin. There is also a cunningly hidden bonus point out there…
228 thoughts on “Salud El Hierro!”
Clip of AVCAN’s animacion of El Hierro’s EQs for today so far:
& now 157 EQs for 15/09/2012 according to AVCAN. Updated clip:
Bit of a swarm on the Reykjanes Ridge with a couple 3+ quakes.
Yes, barely felt here (might have felt thm, not shure), too far away. These are regular, so far few and small, than often. They can get up to 3,8 to 4+ (last large swarm was in Oct/Nov 2009)
Yes! The Reykjanes ridge is certainly active this morning. I blame Irpsit’s hiking boots! 😀
As for El Hierro ! W hat a welcome for Spica 😀 It’s a good job she doesn’t take her laptop with her or she would be glued to that instread of relaxing and enjoying. 😀
Most of the quakes are on the same spot, depth ranging from around 30 km to 1,1 km, perhaps an eruption preparing at a seamount in the Reykjanes volcano system’s part out on the Rekyjanes Ridge. http://www.vedur.is/skjalftar-og-eldgos/jardskjalftar/reykjaneshryggur/
There are at least 2 large volcanoes out there. The last suspected eruption was sometime in the eighties, so I would not be surprised is we got one happening there soon. Could be fun, sometimes there are Islands forming there during eruptions.
I think in sixties there was small one, for a few hours. These need be large to show on surface, rather deep and much currents hamper island building. Eldey is largest there surviving the hefty waves of the North-Atlantic. I think there is not that much activity and do not expect volcanic activity.
I saw a paper about a year ago where they had found a rather hefty field of lava that was judged to be from the eighties. Sadly I did not keep the paper.
I would not be surprised if there was volcanic activity there sooner or later, but as you say, far from all of them builds islands. But, on can always wish 🙂
A lava field from the 80s is mentioned in GVP (08/1990):
Global Incident Map – OLD Quakes?
This site gets its info from these sites:
[link to earthquake.usgs.gov]
[link to http://www.emsc-csem.org]
and GeoScience Australia…
are they trying to tell us something?
USGS and EMSC have no registration of new quakes over the last hours
Resqued from the Dungeons by VC. I have a couple of issues with this comment though. Global Incident Map is not the most reliable even to begin with, and then I haven’t even gotten started with GLP as a source…
A few hours, all parties not provide current data.
It seemed to test the reaction of GLP internautów.Na note the attitude of the trolls
There have been 46 earthquakes since midnight all at deeper depths now approx 22km and some up to a 2.6.
Is this movement of fresh magma now and could it mean that the island structure below is like swiss cheese and the magma is filling up all the holes bit by bit and what will happen when there are no more holes to fill is this not worrying?
Please could someone explain what Tenerife CCAN is picking up this does not look like malfunction of the machine to me ?
Zoomed in, the line signal has gaps in the individual traces tha jump from one top (or bottom) to the next top or bottom.
If its triggered by a valid signal, the it has some serious noise and response issues. Properly working gear doesn’t do that.
One thing that is odd with the current activity in El Hierro is that there is no large GPS movement.
We should by now see that if there was new magma arriving. Even if it was only allready existing magma starting to move in a new direction we should see it on the GPSes. But, we don’t.
I have no good explanation for this.
By now, there are considerable movements on the GPS here: http://www.ign.es/ign/resources/volcanologia/jpg/hierro1SVVRTRF_neu.png, north, west and up.
Yepp, seems like I wrote that an hour before the next update.
Definitly the fourth bolus arriving.
I guess that would cause ripples in several water bottles.
We are UP again.
Click to access FRON.pdf
Click to access REST.pdf
Click to access PINA.pdf
Yes, and the EW NS motion also pans out. So even though this is only one data point we can probably assume that the motion is true.
Tremor has been reported again at 09:48 in the Los Mocanal area.
74 earthquakes so far today: http://www.avcan.org/?m=Animacion
Select 16/09/2012 in the date box.
1165803 16/09/2012 08:48:36 27.7188 -18.0048 19 3.0 mbLg NW EL PINAR.IHI [+]
I managed to get Internet Connection. Look’s like there is some rumblings at Hierro.
Julia Sissi has made her own earthquake detector she has just put two glass vases together and if they make a tinkle noise she says she knows the EQ is a 2.8 and above.
It works as she reported the tremor at 09.48 before it was published.
Natalia, tengo un sismógrafo casero que no falla: dos frasquitos de vidrio, puestos uno al lado del otro. tocándose. Si los frasquitos tintinean, sismo seguro, de más de 2,8
Is the name now Julia Sissi or Natalia?
And @Judith, could you indicate yr. source, please?
The name of the person who wrote the article is Julis Sissi she was answering a question asked by Natalia and that is why her answer starts ,, Natalia I have .,,
The source is https://www.facebook.com/pages/Actualidad-Volc%C3%A1nica-de-Canarias-AVCAN/163883668446
Typo error Julia’s full name is Julia Sisi Parrondo.
Is it possible to say which of AVCAN’s post the comment is made under?
Its the one under the heading :
NOTA 101 AVCAN – 15/09/2012 -23:15h peninsular. – EVOLUCIÓN Y SEGUIMIENTO LA ACTIVIDAD SISMO-VOLCÁNICO EN LA ISLA DE EL HIERRO
On the google map link courtesy of Manfred from his blog he has marked the area of the cliffs he has pointed out where the danger is of landslides
…Top left the Golfotal with La Frontera. The dashed area is about 1000 meters high cliff and about the district boundary between La Frontera and El Pinar (right). Under this green plateau (Pine Forest) with + + + located in the epicenter. There are only a few hundred meters to the Abruchkante Tanganasoga – and that makes things for rockfall and landslide hazard.
Yesterday we had about 13.13 clock in this area as the strongest quake one ML3, 2 earthquake . within 24 km depth..
Some update on the density. Very cealr move to the SE
Is the energy not showing an increase now?
OOPS Dragons please delete sorry this was from yesterday . Thanks.
Kevin Cabrera Felipe has just posted that he has felt sound and a small vibration at 12:05 in San Cristobal La Laguna which is in the North of Tenerife .
He states there is no work nearby or any passing cars and he lives on the first floor.
Spica could very well have a ‘rocking’ holiday!
Did she really not take her laptop?? No internet cafes—to keep connected? She is a whiz!!!
Spica, are you there? Or are you truely out of touch?
We will be going through Spica withdrawal!!!
Was Spica going to the north or south of the island? And how big of an area is Tenerife? Might have experienced this first hand shaking today! An exciting greeting to her vacation.
Been through several small shakers in southern California in the eighties and now, but NOT then, I am glad to say I did experience the sensation of the earth moving—will never forget it! Husband was on a military field exercise in the Ca high desert sleeping in the back of a big truck which began rocking, looked out to see who was joking with him to knock some heads together and he said the sand was rippling as far as he could see. Even felt one here in the southeast U.S. of all places many years ago and knew it sure felt like California. But living in El Hierro with near constant vibration/shaking would unnerve me to no end! My eyes would be glued to my water glass! I feel for the island folks!
Me, too. This is not fun …. 😦
On the other hand, I find interesting what is going on on Reykjanes Ridges southwest of Iceland.
IMO said this morning, nothing special. (http://www.mbl.is/frettir/innlent/2012/09/16/34_skjalftar_fra_midnaetti/ ) But the swarm is now at about 40 quakes, and 5 of them over 3. http://en.vedur.is/earthquakes-and-volcanism/earthquakes/reykjanesridge/#view=table Could be tectonic of course, as there have been some quakes to the south and north of Iceland lately on the MAR, but then there are also seamounts and volcanic ridges in the vicinity, so you never know. 😉
This a very interesting paper about the ridge (although a bit more to the NW): * http://www.sciencedirect.com/science/article/pii/S0264370706000627 Ármann Höskuldsson, e.a.: ”The Reykjanes Ridge between 63°10’N and Iceland”, Journal of Geodynamics 43, 2007, 74-86]
And here is a report about a scientific expedition there in 2007: http://www.soest.hawaii.edu/HIGP/Faculty/hey/rr2007/scienceoverview.html ”Reykjanes Ridge Expedition Science Overview, RV Knorr June 15- July 15, 2007”
And a new post is up…
Thanks for the update, Carl. Appreciated.