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

Tae Kyung Hong; Kiwook Lee

doi:10.1007/s00024-012-0466-8

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

Tae Kyung Hong, Kiwook Lee

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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.

Original language	English
Pages (from-to)	1963-1975
Number of pages	13
Journal	Pure and Applied Geophysics
Volume	169
Issue number	11
DOIs	https://doi.org/10.1007/s00024-012-0466-8
Publication status	Published - 2012 Nov

Bibliographical note

Funding Information:
We are grateful to the Korea Meteorological Administration (KMA) and the Korea Institute of Geoscience and Mineral Resources (KIGAM) for making seismic data available. We thank the editor-in-chief, Professor Brian Mitchell, and two anonymous reviewers for constructive and careful review comments that improved the manuscript. This work was supported by the Korea Meteorological Administration Research and Development Program under Grant CATER 2012-8050.

All Science Journal Classification (ASJC) codes

Geophysics
Geochemistry and Petrology

Access to Document

10.1007/s00024-012-0466-8

Cite this

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title = "m b(Pn) Scale for the Korean Peninsula and Site-Dependent Pn Amplification",

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.",

author = "Hong, {Tae Kyung} and Kiwook Lee",

note = "Funding Information: We are grateful to the Korea Meteorological Administration (KMA) and the Korea Institute of Geoscience and Mineral Resources (KIGAM) for making seismic data available. We thank the editor-in-chief, Professor Brian Mitchell, and two anonymous reviewers for constructive and careful review comments that improved the manuscript. This work was supported by the Korea Meteorological Administration Research and Development Program under Grant CATER 2012-8050.",

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N2 - 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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