| Documento: |
00144 |
| Título: |
Seismic properties of the crust in the volcanic chain of El Salvador. C.A.. |
| Autor: |
Marroquín, Marta Griselda. |
| Fuente: |
Norway; University of Bergen. Institute of Solid Earth Physics; jun. 1998. 55 p. tab, graf. |
| Descriptores: |
GEOLOGIA. SISMOLOGIA. MODELOS MATEMATICOS. GEOFISICA Nota General: Marta Griselda Marroquín, es la coordinadora del área de Sismología del Servicio Nacional de Estudios Territoriales (SNET) -------------------------------------------------------------------------------- |
| Resumen: |
The seismicity recorded in El Salvador is generated for two principal sources: The subduction process of the Cocos plate under the Caribbean plate and local fault movements or volcanic activity. The destructive earthquakes in El Salvador has been located in the volcanic chain by CIG (Centro de Investigaciones Geotécnicas) and CEL (Comisión Ejecutiva Hidroeléctrica del Río Lempa) has been used to determine the crustal structure and the quality factor Q. Additionally some seismological aspects at the Berlin geothermal field and neighbouring Lempa river are shown using the seismicity reported for the recent seismic network installed by CEL.The quality factor Q under the volcanic belt in El Salvador was determined as a function of frequency in the range 1-16 Hz, using 553 microearthquakes with focal depths between 0-20 kms. The model developed by Aki and Chouet for the coda wave generation and propagation was used. The analysis was made for different groups of data. An average of all data results in a Q relationship of: Q=52f 0.78 (Au) - en |
