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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Source parameters of the 1 October 1995 Dinar (Turkey) earthquake from SAR interferometry and seismic bodywave modelling
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Source parameters of the 1 October 1995 Dinar (Turkey) earthquake from SAR interferometry and seismic bodywave modelling

机译：SAR干涉法和地震体波模拟的1995年10月1日第纳尔（土耳其）地震震源参数。

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摘要

The 1 October 1995, M_s = 6.1 Dinar earthquake ruptured a 10 km section of the NW-SE Dinar-Civril fault. There are discrepancies between the published source parameters from seismic data, with seismic moments in disagreement by over a factor of two. We use both SAR interferometry and seismic bodywave modelling to determine earthquake source parameters. An interferogram generated from ERS-1/2 SAR imagery spanning the event, and separated by 5 months, is used to derive source parameters by a downhill simplex inversion with multiple Monte-Carlo restarts. We model the displacements in the satellite line of sight, initially using uniform slip on a rectangular dislocation in an elastic half-space. The resultant model fault plane agrees in strike and location with the observed surface break, but systematic residuals exist in the line-of-sight deformation field, resulting in a r.m.s. residual of 20 mm in the interferogram. The residuals are reduced if the depth distribution of slip is allowed to vary spatially in four segments along a continuous fault plane. Our best-fitting solution, with a r.m.s. misfit of 8 mm, reveals two distinct areas of slip on the fault plane (strike 145 deg, dip 49 deg, rake 270 deg): a main rupture slipping by 1.44 m between depths of 1 and 8 km, becoming deeper to the SE and matching the observed surface rupture, and an along-strike continuation to the NW of the same fault plane, but between depths of 8 and 13 km and not associated with a surface break. The total geodetic moment (4.5 +- 0.1 * 10~(18) N m) is more than twice as large as published seismic moments based on the inversion of P-waveforms alone, but close to the Harvard CMT moment (4.7 * 10~(18) N m). We use SH-waveforms, in addition to the P-waveforms used, previously, to determine an alternative seismic source mechanism. SH-waves constrain the depth to be shallower than solutions based on P-waves alone, agreeing with the depths from the interferometric inversion and resulting in a larger moment (3.1 +- 0.4 * 10~(18) N m) than the previous bodywave estimates (2, 2.1 * 10~(18) N m). The CMT moment reduces in magnitude to a similar size (3.3 * 10~(18) N m) if the centroid depth and fault dip are constrained to the values determined from bodywave modelling and interferometry. Thus, the geodetic moment is 40% bigger than the moment determined from seismology.
机译：1995年10月1日，Ms = 6.1第纳尔地震使NW-SE Dinar-Civril断层的10公里断层破裂。地震数据中公布的震源参数之间存在差异，而地震矩相差超过两倍。我们同时使用SAR干涉测量法和地震体波建模来确定震源参数。从整个事件的ERS-1 / 2 SAR图像生成的干涉图，相隔5个月，用于通过下坡单纯形反演和多次Monte-Carlo重新启动来得出源参数。我们首先对卫星视线中的位移进行建模，首先在弹性半空间中的矩形位错上使用均匀滑动。最终的模型断层平面在走向和位置上与观测到的表面破裂一致，但是在视线变形场中存在系统的残差，从而导致r.m.s。干涉图中残留20毫米。如果允许滑动的深度分布沿连续断层平面在四个部分中在空间上变化，则残差会减少。我们最适合的解决方案8 mm的失配，在断层平面上显示出两个明显的滑动区域（走向145度，倾角49度，倾角270度）：一次主裂隙在1 km和8 km的深度之间滑动了1.44 m，向SE和与观察到的地表破裂相匹配，并沿着同一断层平面的西北走向继续走向，但深度在8至13 km之间，与地表破裂无关。仅基于P波形反演，总的大地矩（4.5 +-0.1 * 10〜（18）N m）大于已发布地震矩的两倍，但接近哈佛CMT矩（4.7 * 10〜 （18）N m）。除了以前使用的P波形外，我们还使用SH波形来确定替代的震源机制。 SH波将深度限制为比仅基于P波的解更浅，与干涉反演的深度一致，并导致比先前的体波更大的力矩（3.1 +-0.4 * 10〜（18）N m）估计（2，2.1 * 10〜（18）N m）。如果质心深度和断层倾角被限制在根据体波建模和干涉法确定的值上，则CMT矩的大小减小到相似的大小（3.3 * 10〜（18）N m）。因此，大地矩比地震学确定的矩大40％。

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