Stress Field Estimations for Colima Volcano, Mexico, Based on Seismic Data |
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Authors: | Francisco J Núñez-Cornú Claudia Sánchez-Mora |
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Institution: | (1) LabTOA, Depto Recursos Naturales, Centro Universitario de la Costa, Universidad de Guadelajara, Ap Postal 96-B, Puerto Vallarta Jal. 48330 Mexico e-mail: fcornu@vallarta.cuc.udg.mx, MX |
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Abstract: | For first time, during 1991, seismic activity was recorded during an eruption at Colima volcano. We analyze these data to
obtain a stress pattern using a composite focal mechanism technique. From the analysis of regional seismicity, the Tamazula
Fault and the Armeria River appear as active features and the dip of the slab east of the Jalisco Block is approximately 12°.
Southwest of Colima volcano a vertical alignment of seismic events was observed. We estimate five different composite focal
mechanism solutions from our data set, which indicate a change of the stress field at the volcano after the 1991 eruption.
These solutions suggest that the stress field in the volcanic edifice was controlled by stresses related to the emplacement
of magma superimposed on the regional stress field. No evidence of active local faults in the volcanic edifice was found.
We propose a model for the eruptive process that involves tilting of the volcanic edifice.
Received: 15 October 1995 / Accepted: 26 October 1998 |
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Keywords: | Colima volcano Mexico Volcanic earthquakes Stress field Focal mechanism Seismicity Jalisco Block Colima Rift Zone |
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