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Procesos de dilatación que acompañan a los terremotos en la caldera del valle largo
1Berkeley Seismological Laboratory, University of California, Berkeley, CA 94720, USA. U.S. Geological Survey, Menlo Park, CA 94025, USA.
Science (New York, N.Y.)
|February 7, 2001
Resumen
Los eventos sísmicos anómalos en la caldera de Long Valley sugieren que la actividad volcánica o hidrotermal está desencadenando terremotos. Estos terremotos exhiben mecanismos de no doble pareja (NDC), lo que indica que los cambios en la presión del fluido influyen en la formación de fallas.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- Volcanología Volcanología.
Sus antecedentes:
- Los terremotos en la caldera de Long Valley pueden estar influenciados por procesos subterráneos.
- Comprender los mecanismos sísmicos es crucial para evaluar los peligros volcánicos e hidrotermales.
Objetivo del estudio:
- Para investigar los mecanismos de origen sísmico de los terremotos durante un enjambre de 1997 en Long Valley Caldera.
- Para determinar si los mecanismos de no doble pareja (NDC) están presentes e indicativos de procesos geológicos específicos.
Principales métodos:
- Determinaciones regionales del tensor del momento sísmico utilizando formas de onda de banda ancha.
- Análisis de los datos de terremotos de un enjambre de noviembre de 1997.
Principales resultados:
- Los terremotos (Mw 4.6-4.9) exhibieron una radiación sísmica anómala con componentes volumétricos significativos (tensores de momento de pareja no doble).
- La dilatación cosisismica observada sugiere un desencadenamiento directo por procesos hidrotermales o magmáticos.
- Soluciones similares de NDC implican un proceso de origen común para estos eventos anómalos.
Conclusiones:
- Es probable que los eventos sísmicos anómalos se desencadenaran por cambios de tensión de la inyección de fluidos a alta presión o el calentamiento magmático.
- Los procesos hidrotermales o magmáticos juegan un papel directo en el desencadenamiento de la sismicidad en la región de Long Valley Caldera.
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