Monitoring seismic velocity change caused by the 2011 Tohoku-oki earthquake using ambient noise records

Shohei Minato, Takeshi Tsuji, Shiro Ohmi, Toshifumi Matsuoka

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

We estimated the changes in seismic velocity in the southern Tohoku district of Japan during the six-month period centered on the 11 March 2011 Tohoku-oki earthquake, using scattered waves retrieved by autocorrelation of ambient seismic noise. The estimated velocity decrease after the earthquake, and after two large aftershocks in the study area, was as great as 1.5% in the area nearest to the mainshock. The velocity changes displayed gradual healing. The spatial distribution of the velocity change showed a correlation with both the changes in static strain, derived from GPS records, and the peak particle velocity experienced during the three earthquakes, derived from strong-motion records. Therefore, our results show that velocity changes possibly contain information from deep in the crust bearing on coseismic stress release, in addition to shallower effects due to strong ground motion.

Original languageEnglish
Article numberL09309
JournalGeophysical Research Letters
Volume39
Issue number9
DOIs
Publication statusPublished - May 1 2012

Fingerprint

Tohoku earthquake 2011
ambient noise
seismic velocity
earthquakes
monitoring
earthquake
seismic noise
strong motion
aftershock
autocorrelation
ground motion
healing
GPS
crusts
Japan
crust
spatial distribution

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Cite this

Monitoring seismic velocity change caused by the 2011 Tohoku-oki earthquake using ambient noise records. / Minato, Shohei; Tsuji, Takeshi; Ohmi, Shiro; Matsuoka, Toshifumi.

In: Geophysical Research Letters, Vol. 39, No. 9, L09309, 01.05.2012.

Research output: Contribution to journalArticle

@article{17483982cd94446ca881784840239757,
title = "Monitoring seismic velocity change caused by the 2011 Tohoku-oki earthquake using ambient noise records",
abstract = "We estimated the changes in seismic velocity in the southern Tohoku district of Japan during the six-month period centered on the 11 March 2011 Tohoku-oki earthquake, using scattered waves retrieved by autocorrelation of ambient seismic noise. The estimated velocity decrease after the earthquake, and after two large aftershocks in the study area, was as great as 1.5{\%} in the area nearest to the mainshock. The velocity changes displayed gradual healing. The spatial distribution of the velocity change showed a correlation with both the changes in static strain, derived from GPS records, and the peak particle velocity experienced during the three earthquakes, derived from strong-motion records. Therefore, our results show that velocity changes possibly contain information from deep in the crust bearing on coseismic stress release, in addition to shallower effects due to strong ground motion.",
author = "Shohei Minato and Takeshi Tsuji and Shiro Ohmi and Toshifumi Matsuoka",
year = "2012",
month = "5",
day = "1",
doi = "10.1029/2012GL051405",
language = "English",
volume = "39",
journal = "Geophysical Research Letters",
issn = "0094-8276",
publisher = "American Geophysical Union",
number = "9",

}

TY - JOUR

T1 - Monitoring seismic velocity change caused by the 2011 Tohoku-oki earthquake using ambient noise records

AU - Minato, Shohei

AU - Tsuji, Takeshi

AU - Ohmi, Shiro

AU - Matsuoka, Toshifumi

PY - 2012/5/1

Y1 - 2012/5/1

N2 - We estimated the changes in seismic velocity in the southern Tohoku district of Japan during the six-month period centered on the 11 March 2011 Tohoku-oki earthquake, using scattered waves retrieved by autocorrelation of ambient seismic noise. The estimated velocity decrease after the earthquake, and after two large aftershocks in the study area, was as great as 1.5% in the area nearest to the mainshock. The velocity changes displayed gradual healing. The spatial distribution of the velocity change showed a correlation with both the changes in static strain, derived from GPS records, and the peak particle velocity experienced during the three earthquakes, derived from strong-motion records. Therefore, our results show that velocity changes possibly contain information from deep in the crust bearing on coseismic stress release, in addition to shallower effects due to strong ground motion.

AB - We estimated the changes in seismic velocity in the southern Tohoku district of Japan during the six-month period centered on the 11 March 2011 Tohoku-oki earthquake, using scattered waves retrieved by autocorrelation of ambient seismic noise. The estimated velocity decrease after the earthquake, and after two large aftershocks in the study area, was as great as 1.5% in the area nearest to the mainshock. The velocity changes displayed gradual healing. The spatial distribution of the velocity change showed a correlation with both the changes in static strain, derived from GPS records, and the peak particle velocity experienced during the three earthquakes, derived from strong-motion records. Therefore, our results show that velocity changes possibly contain information from deep in the crust bearing on coseismic stress release, in addition to shallower effects due to strong ground motion.

UR - http://www.scopus.com/inward/record.url?scp=84861134239&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84861134239&partnerID=8YFLogxK

U2 - 10.1029/2012GL051405

DO - 10.1029/2012GL051405

M3 - Article

AN - SCOPUS:84861134239

VL - 39

JO - Geophysical Research Letters

JF - Geophysical Research Letters

SN - 0094-8276

IS - 9

M1 - L09309

ER -