拉萨和羌塘地块地震活动和热前兆现象及其机理研究

Abstract

Abstract: There are relatively active strong seismicity inside the second-order Lasa and Qiangtang blocks compared with other blocks in the first-order Qing-Zang active block region, which might be related to the weaker crust strength due to thicker crust, higher heat and lower shear strength on normal fault there. Inside the second-order Lasa and Qiangtang active blocks, cases of abnormal heat phenomenon have been observed before two strong earthquakes(M7.3 Yutian earthquake and M6.6 Danxion earthquake in 2008) , which might be related to the dilatation in the faults of earthquake preparation region and nearby, where melting material and liquid enter into from the low velocity layer in upper-middle crust.

Key words: Lasa and Qiangtang blocks, Strong earthquake activity, Precursory heat anormaly, Tectonic activity

CLC Number:

P315.7

FU Zheng-xiang, LU Xiao-jian, ZHANGYuan-sheng, JIN Xue-shen, ZHAO Hui-cheng. Seismicity and Precursory Heat Anormaly in the Lasa and Qiangtang Blocks[J]. EARTHQUAKE, 2010, 30(1): 20-27.

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Seismicity and Precursory Heat Anormaly in the Lasa and Qiangtang Blocks

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