| 论三水地震的成因 |
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| 引用本文： | 魏柏林,郭钦华.论三水地震的成因[J].中国地震,1999,15(3):247-256. |
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| 作者姓名： | 魏柏林 郭钦华 |
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| 作者单位： | 广东省地震局 |
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| 摘 要： | １９９７年９月２３日和２６日，在广东省三水相继发生ＭＬ３．７和４．４地震，由于这两次地震震源浅，具有震级小，烈度高和地震面波发育的特征，因震中位于盐矿开采区，震源深度与盐矿开采注水－抽水深度接近，故震源机制解表明该震为一次沿Ｆ７断上滑错动的正倾滑型地震，显著，这与盐矿注水－抽水采盐有着成生联系。由于注水－抽水极盐使开采地段产生一定规模的采空区，注水沿Ｆ７断层的渗透所产生的孔隙压降低了有效正应力，加
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| 关 键 词： | 注水－抽水采盐 断层 塌陷地震 地震成因 |
The Cause of the Sanshui Earthquakes |
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| Wei Bailin\ Guo Qinhua\ Li Chunqing\ Wu Mingbin\ Miao Weicheng\ Liang Lao.The Cause of the Sanshui Earthquakes[J].Earthquake Research in China,1999,15(3):247-256. |
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| Authors: | Wei Bailin\ Guo Qinhua\ Li Chunqing\ Wu Mingbin\ Miao Weicheng\ Liang Lao |
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| Abstract: | Two earthquakes ( M L 3 3, M L 4 4) occurred successively on September 23 and 26, 1997, in Sanshui, Guangdong Province. Though small magnitude, but high\|intensity and well\|developed surface waves because of the shallow focus (1km).The depth of focus is almost to that of the water pumping in\|out level of a salt mining area where the epicenter located. The focal mechanism shows that the earthquakes belong to normal dip\|slip pattern earthquake, the fault plane downslided and leaped in the dircection of fault F\-7. So, it is clear that the causal relation between the earthquakes and the water pumping in\|out of the salt mining. By considering the produce of mining\|empty area, the lowering of effective normal stress by active pore press and the lubrication of the water seepage, we think that the segment of fault in mining area is out of its bearing capacity to the gravitation of upper body and sliped fault F\-7, that cause collapse earthquake. |
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| Keywords: | Salt mining by water pumping in\|out fault\ Collapse earthquake |
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