High-frequency waves guided by the subducted plates underneath Taiwan and their association with seismic intensity anomalies

Kate Huihsuan Chen, Brian L.N. Kennett, Takashi Furumura

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Energy from seismic events traveling up a subduction zone is frequently associated with significant large-amplitude, high-frequency signals with sustained long coda. Such seismic waves guided by the subducted plate with high wave velocity and high Q can cause surprisingly large seismic intensity in the fore-arc area. In this study, we characterize the guiding behavior of the subducted Philippine Sea plate (PSP) underneath Taiwan and investigate their relationship with anomalous peak ground acceleration (PGA) patterns. Oblique subduction of Philippine Sea Plate beneath northeast Taiwan complicates the guiding phenomena. Seismic waves from events deeper than 60 km offshore northern Taiwan reveal wave guide behavior: large, sustained high-frequency (3-10 Hz) signal in P and S wave trains. With increasing depth, a low-frequency (< 1Hz) first arrival becomes more significant especially for events deeper than 100 km. The time separation between the low-frequency onset and the later high-frequency arrival slightly increases with depth, while the value varies with station due to different travel distances in the shallow crust. The depth-dependent high-frequency content confirms the association with a waveguide effect in the subducting slab rather than localized site amplification effects. We attempt here to obtain a practicable quantification scheme to determine the duration of higher-frequency energy, which can be regarded as an indicator of the guiding effect of the Philippine Sea Plate.

Original languageEnglish
Pages (from-to)665-680
Number of pages16
JournalJournal of Geophysical Research: Solid Earth
Volume118
Issue number2
DOIs
Publication statusPublished - 2013 Feb 1

Fingerprint

Philippine Sea plate
Guided electromagnetic wave propagation
Taiwan
Seismic waves
Philippines
anomalies
anomaly
seismic wave
seismic waves
coda
arrivals
subduction zone
train
P-wave
Amplification
wave velocity
energy
S-wave
amplification
slab

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

High-frequency waves guided by the subducted plates underneath Taiwan and their association with seismic intensity anomalies. / Chen, Kate Huihsuan; Kennett, Brian L.N.; Furumura, Takashi.

In: Journal of Geophysical Research: Solid Earth, Vol. 118, No. 2, 01.02.2013, p. 665-680.

Research output: Contribution to journalArticle

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