Costa Rica volcanoes and the massive earthquake
Sunday Sep 09, 2012 10:59 AM | BY: 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.
Links / Sources:
Saturday, Sep 08, 2012
Thursday, Sep 06, 2012
The new Smithsonian / USGS Weekly Volcanic Activity Report was published today and is summarized as follows: ... [more]
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