Joint Hypocenter Determination for Earthquakes in the Head Regionof Three Gorges Reservoir

SHEN Xue-lin; WEI Gui-chun; CHEN Jun-hua; ZHAO Ling-yun

doi:10.3969/j.issn.1001-5485.2014.06.0052014, 31(06):22-24, 31

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Journal of Changjiang River Scientific Research Institute ›› 2014, Vol. 31 ›› Issue (6) : 22-24. DOI: 10.3969/j.issn.1001-5485.2014.06.0052014, 31(06):22-24, 31

ENGINEERING SAFETY AND DISASTER PREVENTION

Joint Hypocenter Determination for Earthquakes in the Head Regionof Three Gorges Reservoir

SHEN Xue-lin^{1, 2}, WEI Gui-chun^{1, 2}, CHEN Jun-hua^{1, 2}, ZHAO Ling-yun^{1, 2}

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Abstract

According to the data of earthquake arrival time obtained from the Three Gorges network from 2001 to September 9, 2011, we employed the method of joint hypocenter determination to relocate 7011 earthquakes in the head region of Three Gorges area and obtained the station correction values in different stages of water storage. The results show that 1) earthquakes mainly occurred along the Yangtze River and concentrated at Guojiaba-Quyuanzhen, Xietan, and Badong-Wushan areas; 2) the lateral velocity in the head region of Three Gorges reservoir is inhomogeneous, and the velocity distribution is closely related with the geological structure and the condition of water storage; 3) the velocity structure in the head region of Three Gorges reservoir is mainly affected by geological structure before water storage, and is affected by geological structure and reservoir seepage during storage.This method has good effect for seismic location in the head area of the Three Gorges reservoir.

Key words

head region of the Three Gorges reservoir / joint hypocenters determination / station correction value / velocity structure / geological structure

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SHEN Xue-lin, WEI Gui-chun, CHEN Jun-hua, ZHAO Ling-yun. Joint Hypocenter Determination for Earthquakes in the Head Regionof Three Gorges Reservoir[J]. Journal of Changjiang River Scientific Research Institute. 2014, 31(6): 22-24 https://doi.org/10.3969/j.issn.1001-5485.2014.06.0052014, 31(06):22-24, 31

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