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La evidencia de los datos de terremotos para una capa de corteza parcialmente fundida en el sur del Tíbet
1R. Kind and Xiaohui Yuan, GeoForschungsZentrum Potsdam, 14473 Potsdam, Germany. James Ni, Jianxin Wu, C. Reese, T. Hearn, Department of Physics, New Mexico State University, Las Cruces, NM 88003, USA. Wenjin Zhao, Chinese Academy of Geological Sciences, Beijing, China Lianshe Zhao, Institute for Geophysics, University of Texas at Austin, Austin, TX 78759, USA. E. Sandvol, Department of Geological Sciences, Cornell University, Ithaca, NY 14853, USA. J. Nabelek, College of Oceanography, Oregon State University, Corvalis, OR 97331, USA.
Science (New York, N.Y.)
|December 6, 1996
Resumen
Un estudio del sur del Tíbet.
Área de la Ciencia:
- La geofísica es la geofísica.
- Sismología Sismología Sismología.
- La tectónica es la tectónica.
Sus antecedentes:
- La estructura de la corteza de la meseta tibetana es compleja.
- Comprender sus variaciones de velocidad es clave para obtener información sobre la actividad sísmica.
Objetivo del estudio:
- Para investigar la estructura de velocidad de la corteza debajo del sur del Tíbet.
- Identificar las variaciones y sus implicaciones para los procesos geológicos.
Principales métodos:
- Análisis de los datos de terremotos del experimento de fuente pasiva INDEPTH-II.
- Inversión de la función del receptor.
- Análisis de la velocidad de fase de las ondas de Rayleigh.
- Modelado de componentes radiales de la forma de onda P telesísmica. modelado de componentes radiales de la forma de onda P.
Principales resultados:
- Se observó una variación significativa de sur a norte en la velocidad de la corteza terrestre.
- Se identificó una zona de baja velocidad en el medio de la corteza debajo del bloque sur de Lhasa.
- No se detectó ninguna zona de baja velocidad debajo del Tethyan Himalaya.
Conclusiones:
- La zona de baja velocidad de la corteza media sugiere una capa parcialmente fundida en la corteza media.
- Esta capa está presente debajo de la grieta norte de Yadong-Gulu y potencialmente en gran parte del sur del Tíbet.
- Estos hallazgos proporcionan información crucial sobre la evolución tectónica en curso de la región.
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