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首页> 外文期刊>Earth, planets and space: EPS >Slip model of the 2008 M_w 7.9 Wenchuan (China) earthquake derived from co-seismic GPS data
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Slip model of the 2008 M_w 7.9 Wenchuan (China) earthquake derived from co-seismic GPS data

机译：基于同震GPS数据的2008年汶川7.9级汶川地震（中国）滑动模型

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摘要

Near-field co-seismic GPS data were used to derive the slip distribution of the 12 May 2008 Wenchuan earthquake. Based on field measurements and geological observations, the earthquake is represented by ruptures on the Beichuan fault and a neighboring fault from Pengxian to Guanxian, both dipping with a decreasing angle with depth. Using a layered elastic crust model, we obtained a slip model that not only best fits the co-seismic GPS data but which also shows general consistency with the surface ruptures observed from the field survey. The slip maxima are dominant at a very shallow depth near Beichuan and Jiangyou, although the exact peak value of the slip distribution is not well constrained due to the inhomogeneous data coverage in the near-fault area. The maximum slip in our inversion is thus limited to about 9 m, as estimated from the field measurement, but no strict restriction is applied to the slip direction, i.e., the rake angle. The slip model yields a moment magnitude that is very close to M_w = 7.9, which is the estimate based on teleseismic observations. Near the hypocenter, the slip exhibits reverse behavior. The major rupture near Beichuan involves both right-lateral strike-slip and reverse components. Slip on the secondary fault is dominated by the reverse component with a maximum of approximately 2-3 m.
机译：利用近场同震GPS数据得出2008年5月12日汶川地震的滑动分布。根据现场测量和地质观测，地震以北川断层和彭县至冠县的相邻断层的破裂为代表，均随着深度的减小而下降。使用分层的弹性地壳模型，我们获得了一个滑动模型，该模型不仅最适合于同震GPS数据，而且还显示了与现场勘测中观察到的表面破裂的总体一致性。在北川和江油附近的一个很浅的深度，滑动最大值占主导地位，尽管由于近断层地区的数据覆盖不均匀，滑动分布的确切峰值没有得到很好的约束。因此，根据实地测量估计，我们的反演中的最大滑移被限制为大约9 m，但是没有对滑移方向即前角施加严格的限制。滑移模型产生的矩震级非常接近M_w = 7.9，这是基于远震观测的估计。在震源附近，滑移表现出相反的行为。北川附近的大断裂既有右旋走滑，又有逆向断裂。次生断层上的滑动主要由反向分量控制，最大约2-3 m。

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