闽台震源机制和区域应力场
ON THE FOCAL MECHANISMS OF EARTHQUAKES AND REGIONAL STRESS FIELD OF THE FUJIAN-TAIWAN REGION
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摘要: 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.Abstract: In this paper, the focal mechanisms of the earthquakes of M 6, occurred in Taiwan Province and on the sea east of it, from 1933 to 1969 have been critically collected and compiled. In addition, the focal mechanisms of the earthquakes M 6 occurred in Taiwan and Fujian provinces, and in the Strait of Taiwan from 1970 to 1978 and of the earthquake of Magnitude 8 of 1604 are reexamined. After analyzing all these focal mechanism data of the two provinces, it is pointed out that: (1) the focal plane solutions obtained are closely related to the recent crustal movement at depth; (2) most of the directions of principal axis of compressive stress are perpendicular to the major fault zone; (3) on the sea east of Taiwan province, earthquakes moderate in size form three parallel seismic gaps elliptical in shape. Around the gaps, about 83% of the earthquakes of magnitude 6.0-6.9 have their major P axis nearly at right angles to the periphery of the gaps on which most earthquakes of magnitudes equal or greater than 7 occurred; (4) taking the Bashi strait as the center, facing Fujian province, the stress field consists of fan-like pattern toward NW.
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[1] 徐明同,台湾的地震活动性及一些有关问题,中国科学技术情报研究所,1972.
[2] Francis T. Wu, Recent tectonic of Taiwan, J Phys. Earth., 26. Suppl. S265~S299.
[3] Mamoru Katsumata and Lynn R. Sykes, Seismicity and tectonics of the Western Pacific: lzu——Mariana——Caroline and Ryukyu——Taiwan region, Journal of Geophysical Research. 74, 25, 1969.
[4] 张裕明,我国台湾岛的地震构造特征,地震地质,1, 4, 1979.
[5] T. Wu. Francis, Focal mechanisms and tectonic in the vicinity of Taiwan, Bulletin of the Seismological Society of America, 60, 6, 2045——2056. 1970.
[6] Keiiti Aki, 25 Earthquake generating stress in Japan for the years 1961 to 1963, obtained by smoothing the first motion radiation patterns, Bulletin of the Earthq:rake research institute 44, 447——471, 1966.
[7] 邓起东等,中国构造应力场特征及其与板块运动的关系,地震地质,1, 1, 1979,
[8] V. C. Juan, Tectonic evolution of Taiwan, Tectonophysics, 26, 197——212, 1975.
[9] 国际地震资料中心汇编(即I. S. C).
[10] 中国科学院地球物理研究所,中国强地震简目,地图出版社,1976.
[11] 中国科学院地震工作委员会历史组,中国地展资料年表,科学出版社,1956.
[12] 福建省地震目录.
[13] 《地震报告》,台湾省气象所,1951.
[14] 吕新民,恒春地方烈震调查报告,台湾省气象所,1959,
[15] 张丽旭等,1946年12月5日台南地震,台湾地质调查所汇刊第1号.
[16] 徐明同等,台南嘉义地方烈震调查报告,台湾省气象所,1969.[1] 徐明同,台湾的地震活动性及一些有关问题,中国科学技术情报研究所,1972.
[2] Francis T. Wu, Recent tectonic of Taiwan, J Phys. Earth., 26. Suppl. S265~S299.
[3] Mamoru Katsumata and Lynn R. Sykes, Seismicity and tectonics of the Western Pacific: lzu——Mariana——Caroline and Ryukyu——Taiwan region, Journal of Geophysical Research. 74, 25, 1969.
[4] 张裕明,我国台湾岛的地震构造特征,地震地质,1, 4, 1979.
[5] T. Wu. Francis, Focal mechanisms and tectonic in the vicinity of Taiwan, Bulletin of the Seismological Society of America, 60, 6, 2045——2056. 1970.
[6] Keiiti Aki, 25 Earthquake generating stress in Japan for the years 1961 to 1963, obtained by smoothing the first motion radiation patterns, Bulletin of the Earthq:rake research institute 44, 447——471, 1966.
[7] 邓起东等,中国构造应力场特征及其与板块运动的关系,地震地质,1, 1, 1979,
[8] V. C. Juan, Tectonic evolution of Taiwan, Tectonophysics, 26, 197——212, 1975.
[9] 国际地震资料中心汇编(即I. S. C).
[10] 中国科学院地球物理研究所,中国强地震简目,地图出版社,1976.
[11] 中国科学院地震工作委员会历史组,中国地展资料年表,科学出版社,1956.
[12] 福建省地震目录.
[13] 《地震报告》,台湾省气象所,1951.
[14] 吕新民,恒春地方烈震调查报告,台湾省气象所,1959,
[15] 张丽旭等,1946年12月5日台南地震,台湾地质调查所汇刊第1号.
[16] 徐明同等,台南嘉义地方烈震调查报告,台湾省气象所,1969.
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