Lg body-wave magnitude scaling for the continental margin around Korea and japan

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Regional body-wave magnitude scalings are essential for quantification of small and moderate-size earthquakes that are observed only up to regional distances. Crustally-guided shear waves, Lg, develop stably at regional distances in continental crusts and are minimally influenced by the source radiation patterns. Lg body-wave magnitude scalings, m b(Lg); are widely used for assessment of sizes of regional crustal events. The m b(Lg) scaling has rarely been tested in continental margins where Lg waves are significantly attenuated due to abrupt lateral variation of crustal structures. We test the applicability of m b(Lg) scaling to the eastern margin of the Eurasian plate around the Korean Peninsula and Japanese islands. Both third-peak and root-mean-square (rms) amplitudes of Lg vary significantly according to the crustal structures along raypaths, causing apparent underestimation of m b(Lg): Implementation of raypath-dependent quality factors (Q) allows accurate estimation of m b(Lg); retaining the transportability of m b(Lg) in the continental margin around Korea and Japan. The calibration constants for an rms-amplitude-based m b(Lg) scaling are not determined to vary by region in the continental margin due to complicated crustal structures. The calibration constants are determined to be distance-dependent. Both the third-peak-amplitude-based and rms-amplitude-based m b(Lg) scalings yield accurate magnitude estimates when raypath-dependent quality factors are implemented.

Original languageEnglish
Pages (from-to)641-658
Number of pages18
JournalPure and Applied Geophysics
Volume169
Issue number4
DOIs
Publication statusPublished - 2012 Apr 1

Fingerprint

Lg-wave
Korea
body wave
continental shelves
continental margin
Japan
crustal structure
scaling
Calibration
Guided electromagnetic wave propagation
Shear waves
calibration
Q factor
Q factors
Earthquakes
Eurasian plate
continental crust
S-wave
peninsulas
retaining

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

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abstract = "Regional body-wave magnitude scalings are essential for quantification of small and moderate-size earthquakes that are observed only up to regional distances. Crustally-guided shear waves, Lg, develop stably at regional distances in continental crusts and are minimally influenced by the source radiation patterns. Lg body-wave magnitude scalings, m b(Lg); are widely used for assessment of sizes of regional crustal events. The m b(Lg) scaling has rarely been tested in continental margins where Lg waves are significantly attenuated due to abrupt lateral variation of crustal structures. We test the applicability of m b(Lg) scaling to the eastern margin of the Eurasian plate around the Korean Peninsula and Japanese islands. Both third-peak and root-mean-square (rms) amplitudes of Lg vary significantly according to the crustal structures along raypaths, causing apparent underestimation of m b(Lg): Implementation of raypath-dependent quality factors (Q) allows accurate estimation of m b(Lg); retaining the transportability of m b(Lg) in the continental margin around Korea and Japan. The calibration constants for an rms-amplitude-based m b(Lg) scaling are not determined to vary by region in the continental margin due to complicated crustal structures. The calibration constants are determined to be distance-dependent. Both the third-peak-amplitude-based and rms-amplitude-based m b(Lg) scalings yield accurate magnitude estimates when raypath-dependent quality factors are implemented.",
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Lg body-wave magnitude scaling for the continental margin around Korea and japan. / Hong, Tae-Kyung.

In: Pure and Applied Geophysics, Vol. 169, No. 4, 01.04.2012, p. 641-658.

Research output: Contribution to journalArticle

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