青藏高原东北缘超壳断裂的地震学证据

沈旭章; 秦满忠; 张元生; 郭晓; 刘旭宙; 许康生; 梅秀苹; 魏从信

青藏高原东北缘超壳断裂的地震学证据 English Version

沈旭章^1,2,3,
秦满忠^1,2,3,
张元生^1,2,3,
郭晓^1,2,3,
刘旭宙^1,2,3,
许康生^1,2,3,
梅秀苹^1,2,3,
魏从信^1,2,3

1. 中国地震局兰州地震研究所，甘肃兰州 730000 ; 2. 兰州地球物理国家野外科学观测研究站，甘肃兰州 730000 ; 3. 甘肃省岩土防灾工程技术研究中心，甘肃兰州 730000

基金项目: 中国地震局地震预测研究所基本科研业务专项项目(2009A19)；国家自然科学基金项目(40904014)

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作者简介:
沈旭章 (1976 – ) ，男，博士，副研究员，主要从事地球内部物理、地震学和定点形变方面的研究。

中图分类号: TU443
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- 收稿日期: 2011-04-17
- 发布日期: 2011-11-30

Seismological evidence of ultra-crust faults in northeastern margin of Qinghai-Tibet Plateau

SHEN Xu-zhang^1,2,3,
QIN Man-zhong^1,2,3,
ZHANG Yuan-sheng^1,2,3,
GUO Xiao^1,2,3,
LIU Xu-zhou^1,2,3,
XU Kang-sheng^1,2,3,
MEI Xiu-ping^1,2,3,
WEI Cong-xin^1,2,3

1. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China; 2. Lanzhou National Observatory of Geophysics, CEA, Lanzhou 73000, China; 3. Geotechnical Disaster Prevention Engineering Technology Research Center of Gansu Province, CEA, Lanzhou 73000, China

摘要

摘要: 使用天水流动台阵资料，通过远震接收函数偏移成像研究了位于青藏高原东北缘的天水强震区下方地壳速度结构。结果表明位于该区域的略阳 - 迭部和西秦岭北缘断裂为超壳断裂。即断裂达到地壳底部且穿过了莫霍面，导致莫霍面上下两侧速度跃变降低。结果还表明，该区域中强地震常集中发生于地壳内部速度变化显著区域，该区域历史上的巨大地震可能发生在断裂与 20 km 深度附近康拉德界面相互作用的部位。
- 天水强震区 /
- 青藏高原东北缘 /
- 接收函数 /
- 超壳断裂
Abstract: The crustal structure beneath the temporary seismic array is imaged with teleseismic receiver functions in Tianshui earthquake-prone area in the northeast margin of Qinghai-Tibet Plateau. The results indicate that the Lueyang-Diebu fault and the north margin of West Qinling Mountains fault are ultra-crust faults which penetrate the Moho and lead to the weakness of impendence-contrast of Moho. The earthquakes in this area often nucleate in the margin region with sharp variety of the velocity, and the huge earthquakes in history might occurred near the asperity resulting from the interaction between faults and Conrad discontinuity at the depth of about 20 km .
- Tianshui earthquake-prone area /
- northeastern margin of Qinghai-Tibet Plateau /
- receiver function /
- ultra-crust fault

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参考文献(18)

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青藏高原东北缘超壳断裂的地震学证据 English Version

作者简介: 沈旭章 (1976 – ) ，男，博士，副研究员，主要从事地球内部物理、地震学和定点形变方面的研究。

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Seismological evidence of ultra-crust faults in northeastern margin of Qinghai-Tibet Plateau

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作者简介:
沈旭章 (1976 – ) ，男，博士，副研究员，主要从事地球内部物理、地震学和定点形变方面的研究。