| 1931年南海西沙群岛北6 3/4级地震震中位置与震级的讨论 |
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| 引用本文： | 魏柏林.1931年南海西沙群岛北6 3/4级地震震中位置与震级的讨论[J].华南地震,2001,21(1):43-48. |
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| 作者姓名： | 魏柏林 |
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| 作者单位： | 广东省地震局, |
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| 基金项目： | 广东省自然科学基金项目(粤科基［1997］23) |
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| 摘 要： | 根据地震地质构造环境、历史地震烈度记录等资料，对1931年9月21日南海西沙群岛北海中63/4级地震的震中位置和震级进行了讨论。该次地震广州、三水、中山等地的烈度达5°，5°等震线长轴大体呈NW向。由大致勾画的等烈度线图推测，其震中位置应从现定微观震中向东推移110km(20°N，114.1°E)。参考我国63/4～71/2级地震的震中位置与V度等震线最远距离的统计结果，认为上海徐家汇观象台将该震定为7.1级是较为合理的。
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| 关 键 词： | 震中定位 地震烈度图 震级 发震断裂 南海 西沙群岛 地震地质 |
| 文章编号： | 1001-8662(2001)01-0043-06 |
| 修稿时间： | 2000年12月14 |
Discussion on epicenter and magnitude of earthquake (M=6 3/4) in the north of the Xisha Islands of S outh China Sea in 1931 |
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| WEI Bai-lin.Discussion on epicenter and magnitude of earthquake (M=6 3/4) in the north of the Xisha Islands of S outh China Sea in 1931[J].South China Journal of Seismology,2001,21(1):43-48. |
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| Authors: | WEI Bai-lin |
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| Abstract: | Based on the seismogeological tectonic environment , the intensity record of historical earthquakes and so on, it is discussed on the epicenter and magni tude of the MS6 3/4 earthquake in the north of the Xisha I slands of South C hina Sea occurred on September 21,1931. This earthquake caused intensityⅤin Gu angzhou, Sanshui and Zhongshan , the long axis of isoseismic line with intensity about trends NW.According to the iso-intensity line roughly delineated,it is co njectured that the epicenter location should be moved 110 km to east (at 20°N, 114.1°E),and based on the statistical result of the maximum distance from the epicenter location to isoseismic line with intensityⅤ, the magnitude M S=7.1 of this earthquake determined by Xujiahui observatory in Shanghai should be more reasonable. |
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| Keywords: | epicentral location seismic intensity map magnitude Triggering seismic fault |
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