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本文系统地汇集、修订了1933年至1969年台湾及其东部海域6级以上强震的震源机制资料,并重新测定了1970年至1978年台湾6级以上地震,福建省和台湾海峡部份地震以及1604年泉州海外8级强震的震源机制,分析了闽、台两省震源机制特征,指出:(1)由震源机制求出的断层面解与源深处的现代构造运动紧密相关;(2)大部份主压应力轴方向与主要断裂带垂直;(3)在台湾东部海中,中强地震组成三个互相平行的椭圆形空区,空区周围83%的6.0—6.9级地震的主 P 轴方向近似与空区边线垂直,7级以上强震都发生在空区边缘;(4)以巴士海峡为中心,面向福建大陆,应力场呈现向西北展开的扇形分布.
This paper systematically collected and revised the focal mechanism data of strong earthquakes of magnitude 6 or above in Taiwan and its eastern waters from 1933 to 1969 and re-measured some earthquakes of magnitude 6 or above in Taiwan from 1970 to 1978, Fujian Province and Taiwan Strait (1) The fault plane solution derived from the focal mechanism is closely related to the modern tectonic movement at the source depth; (2) ) Most of the principal compressive stress axes are perpendicular to the main faults; (3) In the eastern part of Taiwan, the moderate-strong earthquakes comprise three elliptical empty areas parallel to each other, and 83% of the earthquakes with magnitude 6.0-6.9 around the vacant area The P-axis direction is approximately perpendicular to the edge of the empty area, and strong earthquakes of magnitude 7 and above occur at the margin of the open area. (4) The stress field appears in the fan-shaped distribution spreading to the northwest, centered on the Bashi Strait and facing Fujian Province.