Costarrican volcanoes activity not affected by the Mw7.6 earthquake on sept.5th, 2012
From: Geoffroy Avard <gavard@xxxxxxxxx>
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After the Mw 7.6 earthquake on september 5th., 2012 (08:42 local, 14:42 GMT)
on the Nicoya Peninsula, Costa Rica, concern raised about the possibility of
depressurization in the volcanic range and consequently changes in the
volcanic activity. Preliminary results do not show any affectation on the
volcanic activity.
The seism that took place ~35km depth, 20 km south of Sámara (9.696N, -85.49W)
on the Nicoya Peninsula (NW of the country) had minor effects in the country
considering the magnitude, and aftershocks (more than a 1,000 on September
7th) 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.
The scientists of the OVSICORI-UNA will maintain a close monitoring these next
few weeks to check the validity of these preliminary results.
More info available at: www.ovsicori.una.ac.cr
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