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Gradientes de velocidad P-lateral cerca de las principales fallas de deslizamiento en California
Science (New York, N.Y.)
|July 10, 1981
Resumen
Roca cristalina superficial La velocidad de la onda P cae cerca de las fallas principales debido al aumento de la fractura. Esta fractura influye en cómo la corteza superficial responde al estrés tectónico, impactando la propagación de las ondas sísmicas.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- Las fallas Garlock y San Andreas son los principales sistemas de fallas de deslizamiento de huelga.
- Las velocidades de las ondas sísmicas están influenciadas por las propiedades de las rocas y las condiciones de estrés.
Objetivo del estudio:
- Investigar la relación entre la velocidad de las ondas P y la proximidad a las principales fallas de deslizamiento.
- Comprender el papel de la fractura en la respuesta de la corteza terrestre a tensión tectónica.
Principales métodos:
- Análisis de los datos de velocidad de las ondas P en rocas cristalinas poco profundas.
- Correlación de los gradientes de velocidad con los perfiles de tensión de corte cerca de fallas.
Principales resultados:
- La velocidad de la onda P disminuye de ~5.5 km/s a >20 km a <3 km/s a <2 km de las fallas.
- Se observó un gradiente de velocidad lateral, que coincide estrechamente con el perfil de tensión de corte.
- El aumento de la fracturación de fallas más cercanas se propone como la causa del gradiente de velocidad.
Conclusiones:
- La fractura en roca cristalina de poca profundidad afecta significativamente las velocidades de las ondas sísmicas cerca de las principales fallas de deslizamiento.
- El gradiente de velocidad observado es probablemente causado por el aumento de la fractura, que domina la respuesta de la corteza superficial a la tensión tectónica.
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