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
WEI Bai-lin
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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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 43-48 )