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Published on: August 5, 2016
Modo de atrapamiento sísmico en las zonas de falla de Oroville y San Andreas
Resumen
Los datos sísmicos revelan modos sísmicos atrapados en la zona de falla, interpretados como capas de baja velocidad que actúan como planos de ruptura de terremotos. Estos hallazgos ofrecen información sobre la estructura de la zona de fallas y la mecánica de los terremotos.
Área de la Ciencia:
- Sismología Sismología Sismología.
- Terremoto Geología Terremoto Geología.
Sus antecedentes:
- Se han observado trenes dispersivos de ondas sísmicas después de las llegadas de ondas de cizallamiento en perfiles sísmicos de pozos.
- Estos trenes de ondas se interpretan comúnmente como modos sísmicos atrapados en la zona de falla.
Objetivo del estudio:
- Investigar la naturaleza y las características de los modos sísmicos atrapados en la zona de falla.
- Para modelar las propiedades de la zona de falla utilizando datos sísmicos de las fallas de Oroville y San Andreas.
Principales métodos:
- Se realizó un perfil sísmico de perforación de tres componentes en la falla de Oroville y cerca de la falla de San Andrés en Parkfield.
- Las formas de onda sísmica fueron modeladas como modos SH atrapados dentro de una capa de zona de falla de baja velocidad.
Principales resultados:
- Se identificaron trenes de ondas dispersivas pronunciadas, interpretadas como modos sísmicos atrapados en la zona de falla.
- El modelado sugiere que la zona de falla de Oroville tiene 18 m de ancho con una velocidad de onda de corte de 1 km/s.
- La zona de falla de Parkfield (San Andreas) tiene 100-150 m de ancho con una velocidad de onda de corte de 1.1-1.8 km/s.
Conclusiones:
- Los modos sísmicos atrapados observados indican la presencia de capas estrechas y de baja velocidad dentro de las zonas de falla.
- Estas capas de baja velocidad son probablemente los planos de ruptura responsables de la generación de terremotos.
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