| 川西构造应力场现今变化特征与地震活动 |
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| 引用本文： | 周存忠,高福晖.川西构造应力场现今变化特征与地震活动[J].西北地震学报,1985,7(4):36-45. |
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| 作者姓名： | 周存忠 高福晖 |
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| 作者单位： | 四川省地震局
(周存忠)，中国科学院成都分院(高福晖) |
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| 摘 要： | 本文从电阻式地应力—应变观测系统扩大试验所取得的资料,分析了川西现代构造应力场的变化特征及其与地震活动的关系,指出:川西现代构造应力场有明显的时空变化特点,其积累、加强与释放、回复的反复变化是这一地区强震孕育和接连发生的直接原因。1981年1月24日道孚6.9级地震前,区域构造应力场的主压应力方向曾发生过近90°的转折,持续36天,震前9天恢复为正常方向。本文最后指出:1982年6月16日甘孜6.0级地震后,川西构造应力场较稳定,而川南则加强,因此,川西地震较少,而滇西、滇东北以及元江、红河断裂地震较为活跃,曾于1982年至1983年接连发生中强地震。
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| 收稿时间： | 1985/4/22 0:00:00 |
THE SEISMICITY AND CHARACTERISTICS OF STRUCTURE STRESS FIELD IN WESTERN SICHUAN, CHINA |
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| Zhou Cunzhong and Gao Fuhui.THE SEISMICITY AND CHARACTERISTICS OF STRUCTURE STRESS FIELD IN WESTERN SICHUAN, CHINA[J].Northwestern Seismological Journal,1985,7(4):36-45. |
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| Authors: | Zhou Cunzhong and Gao Fuhui |
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| Institution: | Seismological Bureau of Sichuan Province and Chengdu Branch, Academia Sinica |
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| Abstract: | The investigation for the change of structure stressfield of the crust is one of the important approaches to earthquake prediction. The data analysis on the enlarged tests of a stress-strain observation system of resistance type has shown that in western Sichuan the change in this structure stress field always takes place with time and space.The repeated alteration of the following factors are the immediate reason why the strong earthquakes prepare and occur one by one in this area. They are: accumulation intensifcation, relase and reversion. Luding seismic station had found that before Daofu earthquake of M=6.9 on January 24th, 1981, the direction of the compressive principal stress in the structure stress field had a deflection, near to 90° which lasted 36 days. Stress direction returned to normal 9 days before the earthquake. It has been observed that in western Sichuan, the structure stress field has been in a relatively steady state since Ganzi earthquake of M=6.0 on June 16th, 1982 but in the south it is in an increasing activity, As a result, this new kind of property leads the west of Sichuan to a calm part. but as for the western and northeastern parts of Yannan and fracture zones in Yuanjiang and Honghe are more active and were once hit by strong and moderate earthquakes from 1982 to 1983. |
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