| 沂沭断裂带及其两侧块体现今构造应力场与地震活动 |
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| 引用本文： | 董旭光,周翠英,等.沂沭断裂带及其两侧块体现今构造应力场与地震活动[J].内陆地震,1999,13(4):332-336. |
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| 作者姓名： | 董旭光 周翠英 |
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| 作者单位： | 山东省地震局!济南250021 |
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| 摘 要： | 运用格点尝试法推断了沂沭断裂带现状构造应力场的分段受力环境，初步分析了沭断裂带及其两侧块体在中强地震前后构造应力环境的变化特点。其变化特点为：震前３个区主应力方位值有一个明显的增大趋势；３个区的增大变化为不同步；沂沭带主应力方位值增大出现时间较晚，增幅较大，为阶跃性增大；山东东部的主张应力方位值幅度增大，持续达４年以上，震后３个区主应力方位值出现明显的同步性回落，沂沭带的主应力降幅巨大。
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| 关 键 词： | 震源机制角 构造应力场 沂沭断裂带 地震活动 格点尝试法 |
RECENT TECTONIC STRESS FIELD AND SEISMICITY IN YISHU FAULT ZONE AND ITS TWO SIDES OF BLOCKS |
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| Dong Xuguang\ Zhou Cuiying\ Li Hong.RECENT TECTONIC STRESS FIELD AND SEISMICITY IN YISHU FAULT ZONE AND ITS TWO SIDES OF BLOCKS[J].Inland Earthquake,1999,13(4):332-336. |
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| Authors: | Dong Xuguang\ Zhou Cuiying\ Li Hong |
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| Institution: | Seismological Bureau of Shandong Province\ Jinan\ 250014 |
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| Abstract: | The loading situation of Yishu Fault Zone in recent tectonic stress field is deduced from the focal mechanism solutions of minor shocks in the research area by using grid point cut and try method.The variation features of tectonic stress in Yishu Fault Zone and its east ,west sided area around moderate earthquakes are analyzed preliminarily.It is thought that they have following variation features:(1)Before the earthquakes,the azimuthal angles of principal stress in 3 areas all have an obvious increase and the increases don't synchronize.The increase in Yishu Fault Zone appears late and the amplitudes is large,meanwhile,it's a step increase.And the azimuthal angles of principal extensional stress in eastern Shandong (east sided area of Yishu Fault Zone) showed a larger amplitude of increase,which lasted above four years.(2)After the quakes,the azimuthal angles of principal stress in 3 areas show synchronous drop obviously.Among them,the largest drop amplitude is in Yishu Fault Zone. |
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| Keywords: | Focal mechanism solution\ Tectonic stress field\ Fault zone\ Yishu |
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