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b(Pn) Scale for the Korean Peninsula and Site-Dependent Pn Amplification |
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Authors: | Tae-Kyung Hong Kiwook Lee |
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Institution: | 1. Department of Earth System Sciences, Yonsei University, Shinchon-dong, 134, Seodaemun-gu, Seoul, 120-749, South Korea
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Abstract: | 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. |
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