Pevolca reacted on the earthquake series that happened yesterday and set the western part of the island to a “yellow alert zone”. All this happened in agreement with the government of El Hierro.
Full report (in spanish) and a short excerpt for your information: Closing the lane of the tunnel closest to the exit in Frontera, closing the length of road HI-50 between ‘Cruce de La Tabla’ and ‘Sabinosa’ and the access road to ‘Playa La Madera’, of ‘Pozo de la Salud’ until the crossing with road HI-503.
Yellow informative alert for the population at the zones limited by HI-500 at ‘Pozo de la Salud’ to the South, en the crossing between HI-500 with HI-400 at the crossing known as ‘El Tomillar’.
The best sites to get the newest information are:
Those 2 sites are not normal blogs like VolcanoCafe publishing a full post every few days but they report close to the “action”.
dfm created a brilliant plot and explained it:
This is the update till 18h43 today
Today there were a number of strong (for El Hierro) earthquakes with quite a few over mag 4 which is quite rare.
In the list of earthquakes you will notice that for the strongest earthquakes there is only one event of similar magnitude (4.6) and that in all the events with mag >=4 (16 out of more than 17000 !) 5 came to happen today.
(The ful list of quakes dfm used can be found in his comment on “Watching Hekla“: dfm says: March 27, 2013 at 21:15 )
Without wanting to be fear mongering, I find this situation unprecedented. If you add this to an also unprecedented trend in the upward component of the GPS, this situation begins to pose a number of questions. Happily (if one may say) the bulk of the seismicity is located at sea and not on the island emerged part.
Meanwhile here is the earthquake update for the period since March 26th 8h18 and 27th @ 18h43. It includes the 4.6 quake.
The color of the quakes is linked to their position on the list (more than 1200 events since March 18th).
I will probably change this next time as the color scale loses its interest.
It is interesting to note in the time-lapse animation that there are first some cluster of quakes in the previous parts, leading to a hypothesis of a “sill” of sorts or at least to an accumulation of rock breaking in the same place. Then most of the “strong” (meaning over Mag 3 ) quakes seem to appear on the border of that cluster (look at 0’20”). Could it be that there was some renewal of magma arrival (a new “bolus”) and that the constraints bring some rock breaking on the limit of the previous cluster. I will only repeat that these new events happen in a zone previously devoid of earthquakes.
The 4.6 event can be well see at 00’49” on the center-left part of the plot, over the 27,6 mark on the abscesses.
Do look at the end of the video in the zoom sequence (1’22” and 1’28”)
On the right side of the colorbar the terrain elevation scale is shown. Magnitude of the events (sorry I stopped at 4 !) is shown on the lower part of the plot.
Data from IGN and NOAA, made on Gnu Octave.
Peter Cobbold noted: Bearing in mind the GPS stations are ~15km away from the swarm centre the 100mm uplift in ten days is unusually high for Hierro. Previous swarms have been co-located with the GPS stations and resulted in smaller uplifts over longer periods,IIRC.
Yesterdays trend. El Nathan did not really see a tendency of the earthquakes coming closer to the island.
In case more earthquake swarms happen, there is the possibility of rockfall (or maybe even landslides). At the very moment an eruption on the island is unlikely in my eyes. (Personal layman opinion.)
Links to watch El Hierro (besides the cams) are to be found on Wonder what Bob is up to.
HEKLA
Lets not forget some here like Jamie and Islander are still on a 24hr Hekla watch.
Hekla is still on alert level yellow but not all too much happened close to it yesterday.
Islander also informed us:
Hekla “news service” latest scoop : IMO has brought back online the fourth (4) SIL for monitoring the greater Hekla area. These are HAU from the west, fedgar. (http://hraun.vedur.is/ja/oroi/fed.gif) from the north, VAT from the east and MJO from the south. Nothing EQ wise then can escape the sharp eyes of the IMO staff. http://hraun.vedur.is/ja/oroi/index.html
Fedgar is not on this overall map.
Again the Hekla links:
- Hekluvöktun Hekla Data
- Hekla GPS
- Borehole Strain and Hekla seismicity
- Website on Hekla ( Swedish)
- Jarðskjálftar
- Seismic stations close to Hekla
————————————————————————————————
Other sites have the information about the earthquakes too but dfm’s plot is only on VC.
Spica
Ha ! the Tsunami of stupidity has begun.
http://www.newsmax.com/TheWire/canary-islands-eruption-tsunami-/2013/03/26/id/496372
Ya know, I actually saw one loon bashing the crap out of another about the Canary tsunami possiblity. The argument was sound, and delt with the sheer displacement availible, and how puny it is in reality.
For people passing by. In order to get close to the energy release of the japanese trunami, you would have to instantly submerge the whole of the island. Even at that you would still be a bit shy.
Answer by volcanologist Erik Klemetti to that: http://www.wired.com/wiredscience/2013/03/seismicity-continues-at-el-hierro/
That last pulse at 16:22 looks a lower frequency:
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2013-03-29_16-17&estacion=CHIE&Anio=2013&Mes=03&Dia=29&tipo=2&hora=16-17
Quakes getting increasingly “wet”.
Ok, stupid question. What is a “wet” quake?
One with a very strong low frequency component. Down below 1 hz or so.
In my line of thinking, it should also have a noticeable coda.
… oh lookie. I get to drive. Again. @##$@#$
Ah, okay. Thanks, Lurking.
Question for the chemists (posed above already but in danger of getting lost). I know sedimentary rock only gets into serious metamorphosis at great depth (something like 700 km for gneiss if I remember correctly) but is it possible that the heat from the plume plus the weight of the edifice could have altered the sedimentary layer sandwiched between the crust and the island? And if so, does this have any implications for magma transport/ fault propagation?
You can also have contact metamophism when there is a magmatic intrusion. This should be what we have at El Hierro. As to its effects on magma transport, your advice is as good as mine…..
Cheers! thanks dfm. I was wondering if this explains why the swarms are constrained in the oceanic crust and seem unable to penetrate the sedimentary layer.
Foliated intermediate species will tend to occur. Shale, Phylite, Schist, Gneiss…. in abouut that order. From pressure vs depths calcs from a while back, I estimate that phyllite is roughly what would be most likely. (in the Jurassic era sediment)
Activity is picking up again.
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresCuasiRealHora.do?nombreFichero=CHIE_2013-03-29_16-17&estacion=CHIE&Anio=2013&Mes=03&Dia=29&tipo=2&hora=16-17&nav=%27cuasi%27
That looks a very large quake at 17:01
Landslides are being reported at ‘Goretta’
Photo of landslides
Hi Alison,
Thanks great find, but just to be pedantic, that’s a rockfall, not a landslide…
Just letting the loons know x
More low frequency, as well
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresHora.do?nombreFichero=CHIE_2013-03-29_17-18&estacion=CHIE&Anio=2013&Mes=03&Dia=29&tipo=2&hora=17-18
Hi all!
ign is down???
up and down, seems to be because of traffic.
Yes I can’t get any updating at the moment. I think too many people logged on after that last (massive?) quake at 7:05
Not down, but probably pretty swamped due to traffic.
4,5 and at only 5km deep? – is that some kind of default dept, or?
2013-03-29 17:01:22.0 27.63 N 18.25 W 10 ML 4.3 M CANARY ISLANDS, SPAIN REGION IMP
2013-03-29 17:01:21.4 27.73 N 18.31 W 20 ML 4.7 M CANARY ISLANDS, SPAIN REGION MAD
2013-03-29 17:01:20.2 27.69 N 18.13 W 2 M 4.5 M CANARY ISLANDS, SPAIN REGION GFZ
http://www.emsc-csem.org/Earthquake/seismologist.php
UTC Date / Time
Mar 29 17:01 PM
Depth
2 km
GEO: Longitude
-18.130
GEO: Latitude
27.690
We may have a winner there
confetti around???
Indeed, but 2 km could also mean they did not calculate it, but….
Look at emsc report above posted link, there are 3 lines all “Manual” determinations the automatic one point to 5km deep down
Where was it? Out in the sea, I hope. ❓
south of Orchilla but not far.
Shows 5km deep, but this website might not be accurate?
http://www.emsc-csem.org/Earthquake/
Website is accessible again, seems no HT or something, so it seems we don’t have a winner but clearly a runner up…
There was also a 3.4 earthquake southeast of Langjokull in Iceland.
Quality is very low, though.
btw: we have a star in iceland..
Strange…16:55 and 17:01 this are 2 different events!!!!
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresCuasiRealHora.do?nombreFichero=CJUL_2013-03-29_16-17&estacion=CJUL&Anio=2013&Mes=03&Dia=29&tipo=1&hora=16-17&nav=%27cuasi%27
http://www.01.ign.es/ign/head/volcaSenalesDiasAnterioresCuasiRealHora.do?nombreFichero=CJUL_2013-03-29_17-18&estacion=CJUL&Anio=2013&Mes=03&Dia=29&tipo=1&hora=17-18&nav=%27cuasi%27
http://www.01.ign.es/ign/layoutIn/volcaListadoTerremotos.do?zona=2&cantidad_dias=10 do not point right…..
http://www.01.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=CHIE_2013-03-29&ver=s&estacion=CHIE&Anio=2013&Mes=03&Dia=29&tipo=1
another photo for the missing burp at 16:55, tornilo like also….
Hekla plot getting livlier. http://hraun.vedur.is/ja/hekla/borholu_thensla.html
The first spike is the 3,2 magn. quake which just happened at part of the Langjökull swarm (8 quakes sofar), but I still believe in a tectonic origin. http://en.vedur.is/earthquakes-and-volcanism/earthquakes/langjokull/#view=table as the red component is not moving on the next SIL station’s tremor plot: http://hraun.vedur.is/ja/oroi/gyg.gif
3,7 and 99% at 17:24GMT
There could be come in one at Askja also. It is on the tremor chart http://hraun.vedur.is/ja/oroi/ask.gif and on the Alert Map http://hraun.vedur.is/ja/alert/2013/mar/28/073.html .
Is there a volcano near there? (I know there are volcanoes everywhere in Iceland – but one specifically where these tremors are located)
There is a big glacier shield called Langjökull in the vicinity with not only one, but central volcanoes under it. The connected volcanic systems reach out from under the glacier in different directions. This SIL station could eg. pick up tremor from the southern Langjökull system – if there were some.
Two central volcanoes under Langjökull, I meant.
Thanks Inge!
To emsc canary are goes by MANUAL inputs in this crisis
upaaa! 17:45
Another quake just hit at I think 17:45.
Yap, looks alike 16:55 missing burp
A M 4.7 at El Hierro, felt all over the island. People were screaming on the streets. Reports of rockfalls (AVCAN comments).
Landslides reported at La Frontera
EMSC: 27.62 N 18.34 W 5 4.5 CANARY ISLANDS, SPAIN REGION
IGN shows it as a 4.7 at a depth of 20 km.
Is it volcanic or tectonic? The earthquakes in Iceland?
17:24:20 64.498 -20.055 4.1 km 3.5 99.0 23.7 km NNE of Geysir
I was just saying I leave the PC to make evening meal and it all happens! I was writing a comment than clicked myself off 😦
Quite a little group of tremors….http://en.vedur.is/earthquakes-and-volcanism/earthquakes/langjokull/
What Volcano system is near there? Or is this purely tectonic. I think probably the latter.
I have to get ready for work now 😦 I’ll miss all the evening’s excitement 😦 😦
That one, yeah 🙂
tectonic
mbLg 4.7 means higher than the previous record (4.6, three times since 2011)
How many 4.6s has poor El Hierro had in this latest crisis, let alone the 4.7?
As far as I remember, it never went over 4,3 up to now. But they had thousands of quakes in the whole, a lot of them over 3 and felt by the population. :(:
It must be absolutely terrifying for the poor people there: stronger quakes and coming thick and fast.
Earthquake of magnitude 4,6 as reported by IGN:
11/11/2011 00:20:16
27/03/2013 15:07:56
29/03/2013 08:14:44
USGS reports on the EQ:
4.6 31km WSW of Frontera, Spain 2013-03-29 17:01:21 27.648°N 18.299°W 17.3
So they are giving the depth at 17.3 km
My sister lives in Spain. All these quakes El Hierro is having weren’t even mentioned on National news until today. What a coincidence that people will now have reached their holiday destinations there and THEN they mention the quakes!
Yes, but there were always the possibility to get the information on the internet.
Not many people would think to check it out if it wasn’t in their newspapers on on TV
Didn’t IGN also clip the connecton to the servers on the height of the last crises?
By the way, I still can’t get IGN to load, anyone else still getting the same problem?
Yes, me too, perhaps they clipped the connection so as not to overload.
Me too
same..
Me too, even ign.es
let alone CHIE.
and http://www.01.ign.es/
the start of the string that hosts CJUL
Even Earthquake report have the problem. 🙂 They say,………………………..
2013-03-29 18:39 UTC
– If you cannot reach IGN, you are not the only one ! We neither. Probably a bandwidth problem
Pingback: EL Hierro still going strong and a riddle | volcanocafe
Can’t access IGN either.
I wonder if we are making the problem worse by keeping retrying? I will go off for a while and do something else I think. Be back in time for the bar opening. 😀
Haha, the wirch strikes again! It is now loading folks. I knew I could fool them. LOL
oops witch
Perhaps better to leave them alone for some time. It is not so necessary for us, to get the information at once. 🙂
Links to other services providing information for bigger quakes in El Hierro:
– GFZ Potsdam: http://geofon.gfz-potsdam.de/eqinfo/list.php
– EMSC: http://www.emsc-csem.org/#2
– USGS: http://earthquake.usgs.gov/earthquakes/map/
Wirch? Is tha like a Witch than can’t keep it on the road? Trees can bbe a real hazard…. and not just to golfers 😀
Today is now officially the busiest day in the history of VolcanoCafe 🙂 never before have we seen this much pageviews and visitors!
A very big thanks to all commenters for making this place such a lively place! And also thanks to all Dragons for providing the posts and keeping the dungeons clean!
My thanks go to all the Dragons who look after us so well. 😀
Spica has put up a new post!!
EMSC now puts the depth of the 4,6 at 2 km! What a mess!
New post is up: https://volcanocafe.wordpress.com/2013/03/29/el-hierro-still-going-strong-and-a-riddle/
Pingback: Rockfall at El Hierro after M4.9 Earthquake – 31st March 2013 | Family Survival Protocol