Earthquake Rupture Scaling Relations for Mainland China
Earthquake Rupture Scaling Relations for Mainland China
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DOI：
10.1785/0220190129
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发表时间：
2019
影响因子：
3.3
通讯作者：
Jia Cheng;Y. Rong;H. Magistrale;Guihua Chen;Xi-wei Xu
中科院分区：
文献类型：
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作者：
Jia Cheng;Y. Rong;H. Magistrale;Guihua Chen;Xi-wei Xu
震级-破裂标度关系描述了断层破裂的长度、宽度和面积如何随地震震级变化。这些参数在地震危险性模型中是必需的，以将模型的地震拟合到断层上，并定义地面运动预测方程中所需的场地破裂距离。我们收集了中国大陆及邻近地区91次地震的震级和破裂参数，研究了震级-破裂标度关系。我们发现，地下破裂长度（RLD）从不同的方法得到的地震震级没有系统的偏差。我们使用一般正交回归进行RLD与震级和破裂宽度的回归。在此基础上，推导出了破裂面积与震级的关系。如果不使用1900年前中国东部5次大地震的参数，我们的关系与其他人使用全球数据集得出的结果在统计上没有差异。然而，如果使用这五个地震，中国东部大走滑地震的震级-破裂长度标度关系给出的破裂长度比中国西部和世界上其他板块边界地区的地震短。
Magnitude‐rupture scaling relations describe how the length, width, and area of fault rupture vary with earthquake magnitude. These parameters are required in seismic hazard models to fit the models’ earthquakes onto faults and to define the site‐rupture distances needed in ground‐motion prediction equations. We collected the magnitude and rupture parameters of 91 earthquakes in Mainland China and nearby regions to study magnitude‐rupture scaling relations. We find no systematic deviations for the subsurface rupture length (RLD) obtained from different methods versus earthquake magnitude. We performed regressions of RLD versus magnitude and versus rupture width using general orthogonal regression. Then, we derived the relations between rupture area and magnitude. Our relations are not statistically different from the results derived by others using global datasets, if the parameters of the five pre‐1900 great earthquakes in eastern China are not used. However, if the five earthquakes are used, the magnitude‐rupture length scaling relation for large strike‐slip earthquakes in eastern China gives shorter rupture lengths than earthquakes in western China and other plate boundary regions in the world.