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Geofísica. también conocido como geofísica. geofísica. Un temblor migratorio frente al sur de Kyushu como evidencia
Y Yamashita1, H Yakiwara2, Y Asano3
1Institute of Seismology and Volcanology (SEVO), Faculty of Sciences, Kyushu University, 2-5643-29 Shin'yama, Shimabara 855-0843, Japan. yamac@eri.u-tokyo.ac.jp.
Science (New York, N.Y.)
|May 9, 2015
Resumen
Terremotos poco profundos y lentos detectados en el sur de Kyushu ofrecen información sobre las zonas de subducción. Su actividad de temblor, vinculada a terremotos de muy baja frecuencia, sugiere una conexión con eventos de deslizamiento lento.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- La interfaz de subducción cerca de la zanja es crucial para comprender las rupturas de grandes terremotos y la generación de tsunamis.
- Los terremotos poco profundos y lentos proporcionan información clave sobre esta compleja región geológica.
Objetivo del estudio:
- Para analizar la actividad sísmica a poca profundidad y su relación con los terremotos de muy baja frecuencia (VLFE) en la interfaz de placas poco profundas.
- Para investigar los patrones de migración de temblores en zonas de subducción poco profundas.
Principales métodos:
- Se utilizaron sismómetros del fondo del océano para monitorear la sismicidad en alta mar cerca del sur de Kyushu, Japón.
- Se registró y se analizó un episodio de un mes de duración de temblores de baja frecuencia asociados con VLFE.
Principales resultados:
- Se observó un episodio completo de temblores superficiales de baja frecuencia vinculados a VLFEs en la interfaz de placas poco profundas.
- Se identificaron dos modos distintos de migración de temblores: propagación lenta a gran escala y reversión rápida.
- Se notaron similitudes entre los patrones de migración de temblores superficiales y profundos.
Conclusiones:
- El temblor observado y la actividad VLFE sugieren una conexión con la migración episódica de eventos de deslizamiento lento.
- Las propiedades de migración del temblor superficial se asemejan a las del temblor profundo en otras zonas de subducción.
- Los eventos de deslizamiento lento pueden desencadenar temblores superficiales y profundos y VLFE.
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