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Costa Rica volcanoes and the massive earthquake

dimanche sept. 09, 2012 08:59 | AUTEUR : T

After the magnitude 7.6 earthquake on 5 September (08:42 local, 14:42 GMT) on the Nicoya Peninsula in Costa Rica, concern was raised about the possibility of changes in the volcanic activity.
Preliminary results do not show any significant effects on Costa Rica's volcanoes. The quake took place at about 35km depth, 20 km south of Sámara (9.696N, -85.49W) on the Nicoya Peninsula (NW of the country). It had minor effects in the country considering the magnitude, and aftershocks (more than a 1,000 on 7 September) are occurring around the epicentral area and beyond the volcanic range.
After field investigation and collection of information, the scientists of the volcano observatory (OVSICORI-UNA) are reporting that only small gravitational collapsed occurred without modifying the volcanic activity of the five monitored volcanoes.
The most affected volcano, Arenal, suffered moderate rock avalanches up to the middle of the flank, mainly from the unstable blocks on the north rim of the crater.
Minor rockfalls were reported from Irazú´s main crater walls. Rincón de la Vieja, Poás and Turrialba do not show significant changes related to this seismic event.
(Source: Earthquake-Report)
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Source:
Actualités précédentes
samedi, sept. 08, 2012
Apoyeque volcano near Managua, Nicaragua, has been experiencing a seismic swarm of shallow quakes including several larger than magnitude 3 since Thursday. ... [details]
jeudi, sept. 06, 2012
The new Smithsonian / USGS Weekly Volcanic Activity Report was published today and is summarized as follows: ... [details]
mercredi, sept. 05, 2012
Krakatau volcano has been calm since 3 Sep. We posted some reports and photos from our expedition groups who happened to be there during 3-4 September. ... [details]

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