El Hierro Update 4/20

El Hierro Volcano : Green and Yellow – Pevolca changes alert status from Yellow to Green

Last update: April 20, 2012 at 12:23 pm by By 


Update 20/04 – 12:17 UTC
– Joke Volta’s images of today April 20. Calima (African desert dust fog) has finally gone and the pictures are getting more colorful.


Update 20/04 – 07:50 UTC
– NO listed earthquakes since midnight

Update 19/04 – 23:55 UTC
– A third El Hierro earthquake at 18:59 today. Magnitude 0.7, depth 12 km. Epicenter here.
– We have changed the title a little bit to reflect the current situation. No immediate risk to the island anymore, but still some minor volcanic activity (mainly earthquakes and a little degassing) around the main vent.

Update 19/04 – 15:21 UTC
– It looks like the volcano doesn’t like Pevolca or Mr. Armas :) !.  Almost together with Mr. Armas tweet, the ground was shaking again, a M1.2 earthquake at 13:01 UTC at a depth of 10 km, here

Update 19/04 – 14:09 UTC
– More details have been reported a little later, such as :
* the alert level of the island itself will change from Yellow to Green
* the area surrounding the main vent is downgraded from Red to Yellow (in other words, some limited vigilance remains around the volcano)
* The BIO Las Palmas (Oceanographic vessel), who made some extensive bathymetry last week, measured the depth of the cone at 86 meter.
* Today’s images of Joke Volta

Update 19/04 – 12:09 UTC
– In a short twitter message from the Cabildo de Hierro (office of Mr. Alpidio Armas),  the Green Alert of the entire island has been declared by Pevolca. Due to the very slim activity of the last couple of weeks (only faint stains and degassing), the Alert level change seems logical to Earthquake-Report.com

Update 19/04 – 11:03 UTC
– We have noticed one M2.2 earthquake at a depth of 32 km at 08:32 UTC at a very unusual place, which may explain the difference in depth.

Update 18/04 – 21:32 UTC
– ER reader John commented on our remark from this morning that we did not know where CHIE station was exactly. He said : found the location of CHIE it is Latitude 27.72700 Longitude -17.96070 . Information found athttp://www.isc.ac.uk/cgi-bin/stations?listr=Canary+Islands:Europe. Thank you John.
– 1 new earthquake at 14:37 UTC at a depth of 1 km (mostly IGN revises these shallow depths which has not been done so far)  ! Magnitude : 0.5. Epicenter here

Update 18/04 – 12:12 UTC
– Joke Volta images of today April 18, a “Calima” day (special regional weather type). Joke hasn’t seen anything special today, but nevertheless she continues to make pictures mainly to have a full series of visuals.

Update 18/04 – 10:52 UTC
– 1 earthquake since midnight. Magnitude 1.4 at a depth of 13 km. Epicenter here
– ER reader Leona has commented that it looks that the thickness of the CHIE HT line has increased since more than 24 hours now. We have the same feeling and have therefore increased the line with the same factor today and 4 days ago. Of course this should not mean anything, as it maybe temporary noise or even instrumental error margin. We neither have an idea where CHIE comes from. El Hierro has a lot of different instruments.

Comparison in amplitude of CHIE graph El Hierro

Update 17/04 – 14:40 UTC
– Both the Chile, Valparaiso Mw6.7 earthquake and the Papua New Guinea Mw6.8 earthquake can be seen on the CHIE El Hierro graph.

for more information and updates, go to:    http://earthquake-report.com/2011/09/25/el-hierro-canary-islands-spain-volcanic-risk-alert-increased-to-yellow/