关键词: 南黄海, 地震烈度区划, 发震断层

Abstract:

In the northern area of southern Yellow Sea, an Ms 5.3 earthquake occurred on Jan. 23, 1992, which is just in the forecasted risk area of 1992. The earthquake sequence is distributed dominantly in NE-direction and secondarily in NW-direction, and the long axis of the isoseismic lines is slightly in NE-direction, accordant to the characteristics of structure near the epicentral region in which the NE-direction faults are dominant while the NW-derection ones are secondary. So we think that this earthquake might be generated by the two groups of the conjugate faulting trending NE and NW, respectively but mainly along the NE-direction one. Moreover, based on the intensity of the historical seismicity and the scale of the faults, we infer that the moderate-strong earthquakes will be dominant in this area with little potential for generating Ms≥7 earthquakes in future.

Key words: Southern Yellow Sea, Seismic intensity, Earthquake faulting