| 唐山地震序列的应力释放调整过程 |
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| 引用本文： | 李钦祖,刁桂苓,戴英华.唐山地震序列的应力释放调整过程[J].地球物理学报,1983,26(3):224-236. |
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| 作者姓名： | 李钦祖 刁桂苓 戴英华 |
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| 作者单位： | 河北省地震局 |
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| 摘 要： | 本文搜集了1976年7月28日至1979年12月31日期间唐山地震序列中所有M_s≥4.0地震的初动资料。这些资料来自于68个地震台的记录图和其它14个地震台的数据。其中,167次地震得到可靠的断层面解。对这些断层面解的分析表明,震源区介质中的应力经历了一个由震前紧张平衡态,经主震后的极不稳定态,逐渐向松驰平衡态演变的释放调整过程;对于余震区的不同部分,该过程存在着细节上的差异。两种平衡态下应力主轴的空间取向基本相同,这意味着制约唐山地区构造应力场的周围环境因素没有因发生唐山地震而改变。因此,该地区的构造运动将有继承性,而地震活动将会间歇性地重现。
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| 关 键 词： | 唐山地震序列 余震 调整过程 震源机制 主震 应力释放 应力轴 方均根误差 空间取向 次地震 |
| 收稿时间： | 1982-02-14 |
THE STRESS RELEASE AND ADJUSTMENT PROCESS DURING TANGSHAN EARTHQUAKE SEQUENCE |
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| LI QIN-ZU DIAO GUI-LING DAI YING-HUA.THE STRESS RELEASE AND ADJUSTMENT PROCESS DURING TANGSHAN EARTHQUAKE SEQUENCE[J].Chinese Journal of Geophysics,1983,26(3):224-236. |
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| Authors: | LI QIN-ZU DIAO GUI-LING DAI YING-HUA |
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| Affiliation: | Seismological Bureau of Hebei Province |
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| Abstract: | The first motion data for the sequence of earthquakes with Ms≥4.0 during the period Jul. 28, 1976-Dee. 31, 1979 after the Tangshan earthquake were gathered from readings of seismograms for 68 stations and from bulletin for other 14 stations. The reliable fault plane solutions for 167 earthquakes were obtained. The analysis of these FPS shows that there was a stress release and adjustment process in the source region during the Tangshan earthquake sequence. The process developed gradually from an equilibrium state before the main shock to another equilibrium state, via an extremely unstable state after the main shock; and the detail of the process is different for various parts of the aftershock area. The orientations of principal axes in the two equilibrium states are approximately the same. It implies that principal features of the tectonic stress field of the Tangshan region are not redically changed after the earthquake. Therefore the tectonic movement of this region will continue it's course and the same seismic activity will prevail in the future. |
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