糯扎渡水库地区地震活动和震源参数研究

Abstract

Abstract: Source parameters of 143 M_L≥1.0 earthquakes have been calculated in this paper, using waveform data recorded by the Nuozhadu reservoir earthquake network and Jinghong reservoir earthquake network from January 2011 to March 2014. Variation of seismic activity and the characteristics of source parameters before and after reservoir impounding have been investigated. The results shows that: ① seismicity increased obviously after impoundment, especially 3~4 months after the water level increased; ② hypocentral depths in the reservoir area are smaller at first and then similar with the hypocentral depths outside the reservoir area; ③ corner frequency varies with seismic moment and the log linearity relationship is more obvious after impoundment; ④ stress drop and apparent stress increase with increasing seismic moment, and they are lower in the reservoir area after water filling for the same seismic moment; ⑤ the impact of reservoir on earthquakes can reach 10 km in depth, and is greater in the depth of 3~6 km where the differences of seismic activity and average apparent stress are significant.

Key words: Seismicity, Corner frequency, Stress drop, Apparent stress, The Nuozhadu reservoir

CLC Number:

P315.7

PAN Ying, ZHANG Xiao-dong, FU Hong. Seismic Activity and Source Parameters in the Nuozhadu Reservoir Region, Yunna Province[J]. EARTHQUAKE, 2015, 35(3): 31-43.

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Seismic Activity and Source Parameters in the Nuozhadu Reservoir Region, Yunna Province

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