喜马拉雅地区的均衡重力异常与地震活动性

祝恒宾, 周文虎, 武立高

喜马拉雅地区的均衡重力异常与地震活动性

祝恒宾, 周文虎, 武立高

中国科学院地球物理研究所

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- 发布日期: 2011-08-31

THE ISOSTATIC GRAVITY ANOMALIES AND SEISMIC ACTIVITY IN THE HIMALAYAN REGION

ZHTT HENGBIN, ZHOU WENHU, WU LIGAOcom sh advance

Institute of Geophysics, Academia Sinica

摘要

摘要: 根据1950—1975年的地震资料,用地震迭加法绘制了喜马拉雅中、东部地区地震活动性图。并与该地区均衡重力异常进行定量比较。结果表明:在喜马拉雅地区地震活动性随均衡重力异常下降(上升)而增强(减弱),大的负均衡重力异常往往与高地震活动性有关。较强的地震活动通常出现在均衡重力异常水平梯度变化较大的地区,缅甸西北地区地震释放的能量为喜马拉雅中部地区的二倍,结合该地区大地构造,探讨了造成高地震活动性和均衡重力异常的可能原因。

Abstract: In accordance with the earthquake data from 1950—1975, the diagram of seismic activity in the eastern and mid parts of the Himalaya is plotted by using Earthquake Summation Method, and is compared quantitatively with the isostatic gravity anomalies of the region. The result indicates that seismic activity of the area increases (decreases) with isostatic anomalies descent (ascent). Large negative isostatic anomalies is often related to high seismic activity. Stronger seismic activity is usually found in the area where horizontal gradient of isostatic anomalies vary largely. The energy released by earthquake in the northwest part of Burma is as twice large as that in the central part of the Himalayan region. With the tectonics of the region, the possible causes for sei-mic activity and isostatic anomalies are studied.

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参考文献(1)

[1] Zhou Wenhu, Yang Zhanshou, Hengbin, and Ligao, Characteristics of the gravity field and the crustal structure in the eastern and central regions of the Xizang plateau, Geological and Ecological Studies of Qinghai—Xizang Plateau, 1, 673—682, Science Press, Beijing, 1981.

[2] Evans, P., and W. Crompton, Geological factors in gravity interpretation illustrated by evidence from India and Burma, Geol. Soc. London, Q. J., 102, 211—244. 1946.

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文章访问数: 1025
HTML全文浏览量: 35
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喜马拉雅地区的均衡重力异常与地震活动性

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出版历程

THE ISOSTATIC GRAVITY ANOMALIES AND SEISMIC ACTIVITY IN THE HIMALAYAN REGION

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