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首页> 外文期刊>Earthquake Research in China >Discussion on Characteristics of Crustal Deformation along the Zhangjiakou-Bohai Sea Seismotectonic Zone
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Discussion on Characteristics of Crustal Deformation along the Zhangjiakou-Bohai Sea Seismotectonic Zone

机译：张家口—渤海地震构造带地壳形变特征探讨

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摘要

The Zhangjiakou-Bohai Sea fault zone located in the northern part of the North China region is a seismotectonic zone controlling the present-day strong earthquake activities. Under the effect of regional principal compressive stress with the direction of NEE-SWW, a series of NE-trending active tectonic zones have developed, which form a group of conjugated shear fracturing systems and control the occurrence of the present-day strong earthquakes. The feature of crustal deformation around this fault zone is studied in the paper. The long-term crustal deformation pattern from GPS measurements exhibits a relatively complete left-lateral strike-slip movement along the active fault zone. However, studies on crustal deformation by stages indicate that a series of NE-trending large-scale anomalous gradient zones have appeared along the Zhangjiakou-Bohai Sea fault zone before moderately strong earthquakes. They are represented respectively by the activities of the Tangshan-Hejian, the Sanhe-Laishui and the Yanhuai-Shanxi seismotectonic zones. This may indicate the occurrence of med-term precursors to moderately strong earthquakes along Zhangjiakou-Bohai Sea zone. The results in the paper show that the crustal deformation pattern before strong earthquake reveals the information of strain status in the deep seismogenic zone, while the chaotic pattern after the occurrence of strong earthquake represents the adjustment of the covering strata.
机译：位于华北地区北部的张家口-渤海断裂带是控制当今强地震活动的地震构造带。在以NEE-SWW为主的区域主压应力作用下，形成了一系列NE向活动的构造带，形成了一组共轭剪切破裂体系，控制了当今强地震的发生。本文研究了该断层带周围的地壳形变特征。 GPS测量得出的长期地壳形变模式表现出沿活动断层带的相对较完整的左走向走滑运动。然而，对地壳形变的分阶段研究表明，在中强地震发生之前，张家口—渤海断裂带出现了一系列东北向的大尺度异常梯度带。它们分别以唐山-河间，三河-is水和燕淮-山西地震构造带的活动为代表。这可能表明在张家口-渤海地区发生了中期强地震的中期前兆。研究结果表明，强震前的地壳形变模式揭示了深震源区的应变状态信息，而强震后的地壳形变模式则是覆盖层的调整。

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