THE DISTRIBUTION CHARACTERISTICS OF DEFORMATION FIELD CAUSED BY THREE GREAT EARTHQUAKES IN THE QINGHAI-TIBET PLATEAU AND ITS VICINITY SINCE 2001

IF 1.6 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

地球物理学报 Pub Date : 2017-01-01 DOI:10.1002/CJG2.30026

Zhang Yuan-sheng, Zheng Xiao-jing, W. Lanmin

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引用次数: 1

Abstract

Based on a viscous-elastic crustal model with constraint conditions from GPS and seismic dislocation data and adopting the finite element method, we analyzed the crustal deformation characteristics caused by 2001 Kunlun Mountain M S 8.1, 2008 Wenchuan M S 8.0 and 2015 Nepal M S 8.1 earthquakes, obtained the displacement and deformation field. These earthquakes have occurred in the north, east, and south margins of the Tibetan Plateau respectively. Our primary results suggest obvious differences in deformation regimes, seismogenic fault geometry and source parameters, as well as crustal deformation patters despite the substantially similar magnitudes. These differences caused by seismogenic fault nature and subsurface structures are mainly manifested by different scopes of deformed regions and different strain amplitudes. Through these simulation results, we can detect more about the distribution characteristics of stress loading and unloading area caused by large earthquakes. Moreover, it plays an important role in forecasting the earthquake possibility of seismogenic region.

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2001年以来青藏高原及邻近地区三次大地震形变场的分布特征

基于GPS和地震位错数据建立约束条件下的粘弹性地壳模型，采用有限元方法，分析了2001年昆仑山8.1级地震、2008年汶川8.0级地震和2015年尼泊尔8.1级地震引起的地壳变形特征，得到了位移和变形场。这些地震分别发生在青藏高原的北部、东部和南部边缘。我们的初步结果表明，尽管震级基本相似，但在变形机制、发震断层几何形状和震源参数以及地壳变形模式方面存在明显差异。这些差异是由发震断层性质和地下构造造成的，主要表现为不同的变形区域范围和不同的应变幅值。通过这些模拟结果，我们可以更多地了解大地震引起的应力加卸载区的分布特征。此外，它在预测发震区的地震可能性方面也起着重要作用。

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