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

Tae-Kyung Hong, Kiwook Lee

Research output: Contribution to journalArticle

6 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 languageEnglish
Pages (from-to)1963-1975
Number of pages13
JournalPure and Applied Geophysics
Volume169
Issue number11
DOIs
Publication statusPublished - 2012 Nov 1

Fingerprint

peninsulas
Amplification
amplification
stations
Modulation
crustal structure
Earth mantle
estimates
mantle
Eurasian plate
body wave
continental shelves
P waves
P-wave
continental margin
margins
crusts
spatial variation
crust
modulation

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

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.",
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m b(Pn) Scale for the Korean Peninsula and Site-Dependent Pn Amplification. / Hong, Tae-Kyung; Lee, Kiwook.

In: Pure and Applied Geophysics, Vol. 169, No. 11, 01.11.2012, p. 1963-1975.

Research output: Contribution to journalArticle

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AB - 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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