| Earthquake Activity Features Before Earthquakes with Ms ≥ 7.0 in the Central-Northern QinghaiXizang (Tibet) Block |
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| 作者姓名： | Li Ying |
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| 基金项目： | Key Technologies R&D Program of China Earthquake Administration(2001BA601B01-03-04) |
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| 摘 要： | We have studied the seismicity features of M_S≥5.0 earthquakes two years before strong earthquakes with M_S≥7.0 occurred in the central-northern Qinghai-Xizang (Tibet) block since 1920. The results have showed that there is an obvious gap or quiescence of M_S5.0～6.9 earthquakes near epicenters. We have also studied statistical seismicity parameters of M_S5.0～6.9 earthquakes in the same region since 1950. The results have showed that earthquakes with M_S≥7.0 occurred when earthquake frequency is relatively high and earthquake time, space accumulation degrees are rising. And the prediction effect R value scores are between 0.4～0.7. We have concluded that, before earthquakes with M_S≥7.0 in the central-northern Qinghai-Xizang (Tibet) block, M_S5.0～6.0 earthquake activity in the whole area increased and accumulated in time and space, but earthquakes with M_S≥7.0 occurred where M_S5.0～6.0 earthquake activity was relatively quiet.
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Earthquake Activity Features Before Earthquakes with Ms ≥ 7.0 in the Central-Northern QinghaiXizang (Tibet) Block |
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| Li Ying.Earthquake Activity Features Before Earthquakes with Ms ≥ 7.0 in the Central-Northern QinghaiXizang (Tibet) Block[J].Earthquake Research in China,2005,19(2):192-200. |
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| Authors: | Li Ying |
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| Institution: | Earthquake Administration of Ningxia Hui Autonomous Region, Yinchuan 750001, China |
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| Abstract: | |
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| Keywords: | Central-northern Qinghai-Xizang (Tibet)block Strong earthquake Seismicity pattern features Seismicity parameter |
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