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La capa de velocidad ultra lenta de la losa de subducción coincide con los terremotos silenciosos en el sur de México
Teh-Ru Alex Song1, Donald V Helmberger, Michael R Brudzinski
1Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road N.W., Washington, DC 20015, USA. asong@ciw.edu
Science (New York, N.Y.)
|April 25, 2009
Resumen
Los grandes terremotos ocurren en zonas de subducción cerradas. Las capas de velocidad ultra lenta (USL) en México se correlacionan con terremotos silenciosos (eventos de deslizamiento lento), revelando zonas de fricción de transición.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica de placas es la tectónica de placas.
Sus antecedentes:
- Los grandes terremotos ocurren en zonas de subducción de poca profundidad con interfaces de placas bloqueadas.
- Los terremotos silenciosos (eventos de deslizamiento lento) se encuentran en el borde descendente de estas zonas bloqueadas e influyen en los ciclos sísmicos.
Objetivo del estudio:
- Para investigar la relación entre las capas de velocidad ultra lenta (USL) y la aparición de eventos de deslizamiento lento en el sur de México.
- Comprender el papel de la USL en el comportamiento de fricción transicional en la interfaz de la placa.
Principales métodos:
- Análisis de las llegadas de SP convertidas observadas localmente.
- Interpretación de las reflexiones telesísmicas de la parte inferior tomando muestras de la parte superior de la placa de subducción.
- Cartografía espacial de la capa de velocidad ultra lenta (USL) en el sur de México.
Principales resultados:
- La capa de velocidad ultra lenta (USL) varía espacialmente, con un espesor de entre 3 y 5 km con velocidades de onda S de 2,0 a 2,7 km/s.
- La mayoría de los parches de deslizamiento lento identificados coinciden espacialmente con la presencia de la USL.
- Los límites de los eventos de deslizamiento lento se alinean con la ausencia de la USL.
Conclusiones:
- La presencia y extensión espacial de la USL son factores críticos en la ocurrencia de eventos de deslizamiento lento.
- La USL delimita las zonas de comportamiento de fricción transicional en la interfaz de la placa, influyendo en la actividad sísmica.
- Comprender la distribución de la USL es clave para comprender el ciclo sísmico en las zonas de subducción.
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