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首页> 外文期刊>Pure and Applied Geophysics >Crustal Structure of the Korean Peninsula Using Surface Wave Dispersion and Numerical Modeling
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Crustal Structure of the Korean Peninsula Using Surface Wave Dispersion and Numerical Modeling

机译：利用表面波频散和数值模拟的朝鲜半岛地壳结构

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摘要

Surface wave dispersion is studied to obtain the 1-D average velocity structure of the crust in the Korean Peninsula by inverting group- and phase-velocities jointly. Group velocities of short-period Rayleigh and Love waves are obtained from cross-correlations of seismic noise. Multiple-filter analysis is used to extract the group velocities at periods between 0.5 and 20 s. Phase velocities of Rayleigh waves in 10- and 50-s periods are obtained by applying the two-station method to teleseismic data. Dispersion curves of all group and phase velocities are jointly inverted for the 1-D average model of the Korean Peninsula. The resultant model from surface wave analysis can be used as an initial model for numerical modeling of observations of North Korean events for a velocity model appropriated to the Korean Peninsula. The iterative process is focused especially on the surface sedimentary layer in the numerical modeling. The final model, modified by numerical modeling from the initial model, indicates that the crust shear wave velocity increases with depth from 2.16 km/s for a 2-km-thick surface sedimentary layer to 3.79 km/s at a Moho depth of 33 km, and the upper mantle has a velocity of 4.70 km/s.
机译：研究了表面波频散，通过联合反转群速度和相速度来获得朝鲜半岛地壳的一维平均速度结构。短周期瑞利波和洛夫波的群速度是通过地震噪声的互相关获得的。使用多过滤器分析来提取介于0.5到20 s之间的速度。通过将两站法应用于远震数据，获得瑞利波在10s和50s周期内的相速度。对于朝鲜半岛的一维平均模型，所有组速度和相速度的色散曲线共同反转。地表波分析的结果模型可用作适用于朝鲜半岛的速度模型的朝鲜事件观测数值模型的初始模型。在数值模拟中，迭代过程尤其集中在地表沉积层上。通过从初始模型进行数值建模修改的最终模型表明，地壳剪切波速度随着深度的增加而从2 km厚的表层沉积层的2.16 km / s增加到33 km的Moho深度的3.79 km / s ，上地幔的速度为4.70 km / s。

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