| 坚固体模型近地表形变场、应力场时空分布动态模拟研究 |
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| 引用本文： | 陈宇坤,聂永安.坚固体模型近地表形变场、应力场时空分布动态模拟研究[J].西北地震学报,2001,23(2):105-111. |
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| 作者姓名： | 陈宇坤 聂永安 |
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| 作者单位： | 天津市地震局, |
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| 基金项目： | 中国地震局“九五”科技攻关项目（95-04-03-01-03）；天津市地震局中青年基金项目（204016）． |
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| 摘 要： | 基于坚固体孕震模式，参考板内地震孕育特征和华北地区的地质构造特征，建立了4层地壳结构模型，对近地表形变场和应力场的时空分布特征进行了动态模拟研究，结果表明，在地震孕育的中长期阶段，坚固体近地表部位的形变相对稳定，出现研究，结果表明，在地震孕育的中长期阶段，坚固体近地表部位的形变相对稳定，出现形变空区，在孕震的中短期阶段，坚固体近地表部位的形变出现快速增长的态势，平均应力明显增强，这是各种前兆异常出现有规律的迁移变化，即从外国地区逐渐向强震震源区迁移、集中的内在机理。
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| 关 键 词： | 坚固体模式 形变场 应力场 数值模拟 三维模型 孕震模式 地质构造 |
| 文章编号： | 1000-0844（2001）02-0105-07 |
| 收稿时间： | 2000/1/27 0:00:00 |
| 修稿时间： | 2000年1月27日 |
DYNAMIC SIMULATION ON SPACE-TIME DISTRIBUTION OF DEFORMATION AND STRESS FIELDS NEAR SURFACE IN HARD-INCLUSION EARTHQUAKE PREPARATION MODEL |
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| CHEN Yu-kun and NIE Yong-an.DYNAMIC SIMULATION ON SPACE-TIME DISTRIBUTION OF DEFORMATION AND STRESS FIELDS NEAR SURFACE IN HARD-INCLUSION EARTHQUAKE PREPARATION MODEL[J].Northwestern Seismological Journal,2001,23(2):105-111. |
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| Authors: | CHEN Yu-kun and NIE Yong-an |
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| Institution: | Seismological Bureau of Tianjin Municipality, Tianjin 300201, China and Seismological Bureau of Tianjin Municipality, Tianjin 300201, China |
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| Abstract: | On the basis of the hard inclusion earthquake preparation model (HEPM for short) and referring intraplate earthquake preparation characteristics and geologic structure feature of North China,model of crustal structure of four layers with a hard inclusion,a soft inclusion and a vertical fault is constructed. Dynamic simulation on the space time distribution of deformation and stress fields near surface for the model is carried out. The results show that at beginning of earthquake preparation, deformation near surface of the hard inclusion in the model is relatively stable, a deformation gap is showed. During the medium short term period before earthquake, the deformation increased swiftly. Meanwhile, the average stress in the region strengthened obviously,which is the inner mechanism for migration of precursory anomalies with regularity from outer area to epicenter area of strong earthquake. |
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| Keywords: | Hard inclusion earthquake preparation model Deformation field Stress field Numerical simulation Three dimensional model |
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