Rupture directivity effect and stress heterogeneity of the 2013 nantou blind-thrust Earthquakes, Taiwan

Yi Ying Wen, Hiroe Miyake, Yin Tung Yen, Kojiro Irikura, Kuo-En Ching

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

We investigated broadband evidence of the rupture directivity effect and estimated stress drop for the 2013 Nantou blind-thrust earthquakes (the 0327 and 0602 crustal events) from three individual analyses using empirical Green’s functions: deconvolution source time function analysis, source spectral ratio analysis, and broadband waveform modeling of a strong-motion generation area. Although these two adjacent events have similar focal mechanisms, the 0327 event shows only up-dip directivity to the west, with an estimated stress drop of 9.0 MPa, and the 0602 event displays significant rupture directivity to the southwest, with an estimated stress drop of 14.2 MPa. The obvious variance in the rupture behavior and stress drop of these two nearby events, which might be related to immature blind faulting, suggests that this region requires additional study of the stress heterogeneity to better assess the seismic hazard.

Original languageEnglish
Pages (from-to)2933-2942
Number of pages10
JournalBulletin of the Seismological Society of America
Volume104
Issue number6
DOIs
Publication statusPublished - 2014 Dec 1

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Taiwan
directivity
thrust
rupture
Earthquakes
earthquakes
earthquake
broadband
Faulting
time functions
strong motion
Green function
Deconvolution
deconvolution
focal mechanism
seismic hazard
Green's function
hazards
dip
Hazards

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Wen, Yi Ying ; Miyake, Hiroe ; Yen, Yin Tung ; Irikura, Kojiro ; Ching, Kuo-En. / Rupture directivity effect and stress heterogeneity of the 2013 nantou blind-thrust Earthquakes, Taiwan. In: Bulletin of the Seismological Society of America. 2014 ; Vol. 104, No. 6. pp. 2933-2942.
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Rupture directivity effect and stress heterogeneity of the 2013 nantou blind-thrust Earthquakes, Taiwan. / Wen, Yi Ying; Miyake, Hiroe; Yen, Yin Tung; Irikura, Kojiro; Ching, Kuo-En.

In: Bulletin of the Seismological Society of America, Vol. 104, No. 6, 01.12.2014, p. 2933-2942.

Research output: Contribution to journalArticle

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