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La secuencia de terremotos chi-Chi: activa, fuera de la secuencia de empuje de falla en Taiwán
1Institute of Earth Sciences, Academia Sinica, Nankang, Taipei, Taiwan 115, Republic of China. Department of Geology and Mid-America Earthquake (MAE) Center, University of Illinois, Urbana, IL 61801, USA.
Science (New York, N.Y.)
|July 6, 2000
Resumen
La secuencia de terremotos de Chi-Chi de 1999 fue generada principalmente por una falla de empuje de inmersión moderada. Existe una zona sísmica más profunda, lo que sugiere un desprendimiento basal aseísmico y fallas normales.
Área de la Ciencia:
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
- Geología Geología Geología.
Sus antecedentes:
- El terremoto de Chi-Chi de 1999 en Taiwán fue un evento sísmico importante.
- Comprender las estructuras de fallas causantes es crucial para la evaluación del peligro sísmico.
Objetivo del estudio:
- Identificar las estructuras de fallas dominantes responsables de la secuencia de terremotos de Chi-Chi del 20 de septiembre de 1999.
- Para investigar la geología del subsuelo y las zonas sísmicas en el centro de Taiwán.
Principales métodos:
- Combinación de profundidades focales precisas y soluciones del plano de falla de más de 40 eventos sísmicos.
- Datos geológicos subsuperficiales sintetizados.
Principales resultados:
- Se identificó una falla de empuje dominante, de inmersión moderada (20-30 grados) que genera terremotos alejados del frente de deformación.
- Descubrió una segunda zona sísmica subparalela aproximadamente 15 km por debajo del empuje principal.
- Se observó que tanto el decollamento basal como las fallas normales de reliquia parecen ser aseísmicas.
Conclusiones:
- Las zonas sísmicas identificadas difieren de los modelos anteriores del marco tectónico de Taiwán.
- El estudio sugiere que el decollamento basal aseísmico y las fallas normales juegan un papel en la sismotectónica de la región.
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