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m b(Pn) Scale for the Korean Peninsula and Site-Dependent Pn Amplification

机译:朝鲜半岛的m b (Pn)量表和依赖于站点的Pn放大

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摘要

The Korean Peninsula is located in the far-eastern Eurasian plate margin where crustal structures vary laterally, causing significant raypath-dependent modulations of crustal phases. The discriminative variations of crustal phases hinder application of conventional local magnitude scales in the continental margin. The mantle-lid phase is less affected by the crustal structures than the crustal phases, providing a better constraint to magnitude estimation. A regional body-wave magnitude scale based on the mantle-lid P wave (Pn), m b(Pn), is developed for regional events around the Korean Peninsula. The m b(Pn) scale is determined to be m b(Pn) = 0.380 (±0.299) + log A + 2.012 (±0.122) log d, where A is the peak-to-peak Pn amplitude in μm and d is the epicentral distance in km. The m b(Pn) estimates of regional events around the Korean Peninsula are determined. The m b(Pn) estimates are compared with other available magnitude estimates (m b(Lg), M L). The influence of structures beneath stations on Pn amplification is investigated from inter-station magnitude residuals. A characteristic spatial variation of inter-station magnitude residuals with strengths mostly between −6 and 6 %, but with maximum strengths of ±10 %, is observed. The inter-station magnitude residuals appears to be correlated well with geological and seismic structures in the crust.
机译:朝鲜半岛位于远东的欧亚板块边缘,地壳结构横向变化,引起了重要的射线路径依赖性地壳相调制。地壳相的判别式变化阻碍了大陆边缘常规局部量级尺度的应用。与地壳相相比,地幔-盖相受地壳结构的影响较小,为幅度估计提供了更好的约束。针对朝鲜半岛周围的区域性事件,开发了基于地幔盖P波(Pn)m b (Pn)的区域体波震级标度。确定mb(Pn)标度为mb(Pn)= 0.380(±0.299)+ log A + 2.012(±0.122)log d,其中A是峰峰值Pn以μm和d为单位的振幅是以km为单位的震中距离。确定了朝鲜半岛周围区域事件的m b (Pn)估计值。将m b (Pn)估计值与其他可用的幅度估计值(m b (Lg),M L )进行比较。从站间幅度残差研究了站下结构对Pn放大的影响。观察到站间震级残差的特征空间变化,其强度大多在-6%至6%之间,但最大强度为±10%。站间幅度残差似乎与地壳中的地质和地震结构有很好的相关性。

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  • 来源
    《Pure and Applied Geophysics》 |2012年第11期|p.1963-1975|共13页
  • 作者

    Tae-Kyung Hong; Kiwook Lee;

  • 作者单位

    Department of Earth System Sciences, Yonsei University, Shinchon-dong, 134, Seodaemun-gu, Seoul, 120-749, South Korea;

    Department of Earth System Sciences, Yonsei University, Shinchon-dong, 134, Seodaemun-gu, Seoul, 120-749, South Korea;

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