台湾及东部海域强震活动性研究及其对大陆强震的预测意义

The seismicity of strong earthquakes in Taiwan and its eastern sea and the application of prediction to China′s Continent

研究了 1 90 0年以来台湾及东部海域强震 (M≥ 7)时空分布特征 ,收集和测定了 1 933年以来强震震源机制解。结果表明 ,台湾及东部海域存在 3个强震活动带及 4个活跃时段。 2 9个强震震源机制解较好地反映了 3个地震活动带的区域应力场特征和力源。研究认为 ,台湾及东部海域自 1 986年开始的第四活跃时段与大陆地区强震活动的第五活跃期有同期活动特点。据推测 ,我国大陆和台湾的强震活动可能还要持续一段时间。

In this paper, the time and space distribution, the focal mechanism and the regional stress field of strong earthquakes since 1900 in Taiwan and its eastern sea region have been studied. The results show that there are three seismic areas and four active periods of strong earthquake ( M ≥7) from 1900 to 1999 in Taiwan region. The fault plane solutions of 27 strong events since 1933 well represent characteristics of the regional stress fields of the three seismic areas. In comparison with the five active episodes of the China′s continent, strong earthquakes in Taiwan preceded ones of the continent generally. We infer that the fourth active period of Taiwan, which has begun since 1986, and the fifth one of the continent would last till the early stage of this century.