Coseismic velocity variations associated with the 2018 M w 6.4 Hualien earthquake estimated using repeating earthquakes

En-Jui Lee, Ruey-Juin Rau, Po Chen, Dawei Mu, Che Min Lin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Quantifying temporal variations in crustal materials associated with large earthquakes is critical for understanding the physical mechanisms (e.g., healing processes) of faults, therefore important for studies related to earthquake cycles. Repeating earthquakes that have nearly identical waveform recordings are a valuable tool for estimating temporal variations of the earth structures along the wave-propagation paths of the repeating events. We have successfully applied a graphic processing unit (GPU)based template-matching algorithm (cuNCC) to discover potential repeating earthquakes that occurred before and after the 2018 M w 6.4 Hualien earthquake. After accurately relocating the repeating events and quantifying time shifts caused by location and origin-time differences, two repeating event clusters (one doublet and one triplet) were identified for estimating the temporal variations related to the mainshock, based on our stringent qualifying criteria. A moving-window cross-correlation method was adopted to quantify the effects of the temporal changes on seismic waveform recordings. Our measurements show statistically significant delays after the mainshock for body waves, especially S waves, with wave-propagation paths crossing the aftershock zone of the 2018 Hualien earthquake. In addition to body waves, measurements at some stations show significant delays for P- and S-coda waves, suggesting that the scattering waves have also been affected by the temporal changes in material properties caused by the 2018 M w 6.4 Hualien earthquake. We suggest the seismic community perform continuous monitoring of repeating earthquakes in the future for a more complete analysis to improve our understanding of the temporal material variations caused by the 2018 M w 6.4 Hualien earthquake.

Original languageEnglish
Pages (from-to)118-130
Number of pages13
JournalSeismological Research Letters
Volume90
Issue number1
DOIs
Publication statusPublished - 2019 Feb 1

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earthquakes
earthquake
temporal variation
body wave
wave propagation
S waves
S-wave
waveforms
estimating
recording
wave scattering
Earth structure
coda
healing
aftershock
cross correlation
templates
stations
cycles
shift

All Science Journal Classification (ASJC) codes

  • Geophysics

Cite this

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abstract = "Quantifying temporal variations in crustal materials associated with large earthquakes is critical for understanding the physical mechanisms (e.g., healing processes) of faults, therefore important for studies related to earthquake cycles. Repeating earthquakes that have nearly identical waveform recordings are a valuable tool for estimating temporal variations of the earth structures along the wave-propagation paths of the repeating events. We have successfully applied a graphic processing unit (GPU)based template-matching algorithm (cuNCC) to discover potential repeating earthquakes that occurred before and after the 2018 M w 6.4 Hualien earthquake. After accurately relocating the repeating events and quantifying time shifts caused by location and origin-time differences, two repeating event clusters (one doublet and one triplet) were identified for estimating the temporal variations related to the mainshock, based on our stringent qualifying criteria. A moving-window cross-correlation method was adopted to quantify the effects of the temporal changes on seismic waveform recordings. Our measurements show statistically significant delays after the mainshock for body waves, especially S waves, with wave-propagation paths crossing the aftershock zone of the 2018 Hualien earthquake. In addition to body waves, measurements at some stations show significant delays for P- and S-coda waves, suggesting that the scattering waves have also been affected by the temporal changes in material properties caused by the 2018 M w 6.4 Hualien earthquake. We suggest the seismic community perform continuous monitoring of repeating earthquakes in the future for a more complete analysis to improve our understanding of the temporal material variations caused by the 2018 M w 6.4 Hualien earthquake.",
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Coseismic velocity variations associated with the 2018 M w 6.4 Hualien earthquake estimated using repeating earthquakes . / Lee, En-Jui; Rau, Ruey-Juin; Chen, Po; Mu, Dawei; Lin, Che Min.

In: Seismological Research Letters, Vol. 90, No. 1, 01.02.2019, p. 118-130.

Research output: Contribution to journalArticle

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