库马恩喜马拉雅山的高分辨率速度和应变率场:对地震力矩预算的影响

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Himanshu Verma , Sumanta Pasari , Yogendra Sharma , Kuo-En Ching
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引用次数: 0

摘要

印度板块和欧亚板块之间的碰撞导致一系列地震,释放出长期积累的弹性应变。这项研究利用 22 个新的和 26 个以前公布的 GPS 速度以及 9 年的 InSAR 观测数据,估算了整个库马恩喜马拉雅山脉的高分辨率速度场和应变率场。由此得出的高分辨率速度场相对于印度固定参考框架的范围在 0.5 至 14 毫米/年之间。整个研究区域的大地应变率并不一致,沿中央主推力线观测到的应变率较高。库马恩喜马拉雅山脉沿线的幅值变化率显示了大量的构造压缩,平均值为-0.08 μstrain∕yr,而该地区最大剪切应变率的平均值为 0.08 μstrain∕yr。根据 200 年的累积应变和能量释放,库马恩喜马拉雅山沿线的力矩亏损率为 7.59 × 1018Nm∕yr。这表明,研究区域未来可能会发生大地震(Mw 8.1)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
High-resolution velocity and strain rate fields in the Kumaun Himalaya: An implication for seismic moment budget

The collision between Indian and Eurasian tectonic plates results in a series of earthquakes, releasing stored elastic strain accumulated over a long period. This research utilizes 22 new and 26 previously published GPS velocities along with nine years of InSAR observations to estimate high-resolution velocity and strain rate fields across the Kumaun Himalaya. The resulting high-resolution velocity field ranges between 0.5 and 14 mm/yr relative to the India-fixed reference frame. The geodetic strain rate is not uniform across the study region and the higher strain rates are observed along the Main Central Thrust. The areal change rate along the Kumaun Himalaya indicates a significant amount of tectonic compression, with an average value of − 0.08 μstrainyr, while the maximum shear strain rate in the region has a mean value of 0.08 μstrainyr. The moment deficit rate, based on accumulated strain and energy release over 200 years, turns out to be 7.59 × 1018Nmyr along the Kumaun Himalaya. This suggests that the study region can generate a great earthquake (Mw 8.1) in the future.

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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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