Seismic Source and Path Calibration in the Korean Peninsula, Yellow Sea, and Northeast China
Seismic Source and Path Calibration in the Korean Peninsula, Yellow Sea, and Northeast China
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发表时间：
2007-07
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通讯作者：
R. Herrmann;W. Walter;M. Pasyanos
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文献类型：
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作者：
R. Herrmann;W. Walter;M. Pasyanos
翻译后摘要：两个显着的地震事件进行了分析，根据本合同开发的地壳速度模型。2007年1月20日，韩国发生了M（w）= 4.55的地震，地震发生在韩国的陆地上和密集的数字地震台网内。利用60个宽带、短周期和加速度台站的P波到达，该事件发生在北纬37.68度，东经128.58度，深度7.5公里，地点为20070120115653.8。利用0.05 - 0.20 Hz波段的加速度计记录和0.02 - 0.10 Hz波段的宽带数据进行了震源反演，震源机制和震源深度分别为9和11 km。这是自1996年12月13日的Mw 4.7事件以来，韩国陆地上最大的事件。在INCN和MDJ的波形的正演模拟表明，目前的模型，以配合朝鲜半岛的观测和显着的脉冲形状修改的影响，部分穿越日本海的路径的能力。使用当地网络数据的结果为分析半岛地震事件的其他研究提供了地面实况点。2006年10月9日朝鲜爆炸的各向同性地震矩是根据MDJ和INCN观测到的瑞利波谱振幅估算的。观测到的Love波信号非常小，表明构造释放作用较弱。使用Denny和约翰逊（1991）模型研究爆炸当量，该模型将当量与观测到的各向同性矩作为埋深和材料特性的函数。敏感性分析突出了地球上部千米的假定速度和密度结构以及假定的埋深对估计产量的强烈影响。根据该合同开发的地壳速度模型对地壳浅层的预期剪切波速度提供了强有力的限制。
Abstract : Two significant seismic events were analyzed using the crustal velocity model developed under this contract. The M(w) = 4.55 Korean earthquake of January 20, 2007, occurred in the Republic of Korea on land and within the dense digital seismic network. Using P-wave arrivals from 60 broadband, short-period and acceleration stations, the event occurred at 37.68N, 128.58E at a depth of 7.5 km at 20070120115653.8. Source inversion was performed using the accelerometer recordings in the 0.05-0.20 Hz band and the broadband data in the 0.02-0.10 Hz band, with identical focal mechanisms and source depths of 9 and 11 km, respectively. This is the largest event on land in South Korea since the Mw 4.7 event on December 13, 1996. Forward modeling of the waveforms at INCN and MDJ indicates the ability of the current model to match observations on the Korean Peninsula and the effect of significant pulse shape modification for paths that partially cross the Sea of Japan. The results of using the local network data provide a ground truth point for other studies analyzing seismic events on the peninsula. The isotropic seismic moment of the October 9, 2006, North Korean explosion was estimated from the Rayleigh-wave spectral amplitudes observed at MDJ and INCN. Very little Love wave signal was observed, indicating weak tectonic release. The explosion yield was investigated using the Denny and Johnson (1991) model relating yield to the observed isotropic moment as a function of depth of burial and material properties. Sensitivity analysis highlights the strong effect of the assumed velocity and density structure in the upper kilometer of the Earth and the assumed depth of burial on the estimated yield. The crustal velocity model developed under this contract provides strong constraints on the expected shear-wave velocities in the shallow parts of the crust.