Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake

M. Hori, Satoshi Matsumoto, K. Uehira, T. Okada, T. Yamada, Y. Iio, M. Shinohara, H. Miyamachi, H. Takahashi, K. Nakahigashi, A. Watanabe, Takeshi Matsushima, N. Matsuwo, T. Kanazawa, Hiroshi Shimizu

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

On March 20, 2005 the West off Fukuoka Prefecture earthquake (magnitude of 7.0 on the JMA scale) occurred in southeastern Japan. The earthquake fault was a left-lateral strike-slip having a nearly vertical fault plane and a strike in the WNW-ESE direction. The largest aftershock with a magnitude of 5.8 (JMA) followed 1 month later. To gain more detailed aftershock data, several teams from different Japanese universities jointly installed a number of temporary seismic stations and positioned Ocean Bottom Seismometers (OBSs) immediately above the focal area. Double-difference tomography was used to estimate the three-dimensional (3D) (Zhang and Thurber, 2003) velocity structures in and around the focal area based on the travel time data collected during seismic observations. The high-velocity regions estimated by the inversion are located on the edge of the aftershock area and on the shallow part of asperity, as inferred from the slip distribution. Conversely, the Vp/Vs ratio is not always as high as that found at the location of the asperity. This finding suggests that the construction of the medium is not uniformly elastic but complex, with different relations between elastic constants and strength.

Original languageEnglish
Pages (from-to)1621-1626
Number of pages6
Journalearth, planets and space
Volume58
Issue number12
DOIs
Publication statusPublished - Jan 1 2006

Fingerprint

velocity structure
aftershock
tomography
earthquakes
asperity
earthquake
slip
proportional limit
ocean bottom seismometer
ocean bottom
seismographs
earthquake magnitude
fault plane
travel time
travel
Japan
elastic properties
stations
inversions
estimates

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

Cite this

Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake. / Hori, M.; Matsumoto, Satoshi; Uehira, K.; Okada, T.; Yamada, T.; Iio, Y.; Shinohara, M.; Miyamachi, H.; Takahashi, H.; Nakahigashi, K.; Watanabe, A.; Matsushima, Takeshi; Matsuwo, N.; Kanazawa, T.; Shimizu, Hiroshi.

In: earth, planets and space, Vol. 58, No. 12, 01.01.2006, p. 1621-1626.

Research output: Contribution to journalArticle

Hori, M, Matsumoto, S, Uehira, K, Okada, T, Yamada, T, Iio, Y, Shinohara, M, Miyamachi, H, Takahashi, H, Nakahigashi, K, Watanabe, A, Matsushima, T, Matsuwo, N, Kanazawa, T & Shimizu, H 2006, 'Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake', earth, planets and space, vol. 58, no. 12, pp. 1621-1626. https://doi.org/10.1186/BF03352672
Hori, M. ; Matsumoto, Satoshi ; Uehira, K. ; Okada, T. ; Yamada, T. ; Iio, Y. ; Shinohara, M. ; Miyamachi, H. ; Takahashi, H. ; Nakahigashi, K. ; Watanabe, A. ; Matsushima, Takeshi ; Matsuwo, N. ; Kanazawa, T. ; Shimizu, Hiroshi. / Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake. In: earth, planets and space. 2006 ; Vol. 58, No. 12. pp. 1621-1626.
@article{b009333e9c9149a283470cb6c2dee4d5,
title = "Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake",
abstract = "On March 20, 2005 the West off Fukuoka Prefecture earthquake (magnitude of 7.0 on the JMA scale) occurred in southeastern Japan. The earthquake fault was a left-lateral strike-slip having a nearly vertical fault plane and a strike in the WNW-ESE direction. The largest aftershock with a magnitude of 5.8 (JMA) followed 1 month later. To gain more detailed aftershock data, several teams from different Japanese universities jointly installed a number of temporary seismic stations and positioned Ocean Bottom Seismometers (OBSs) immediately above the focal area. Double-difference tomography was used to estimate the three-dimensional (3D) (Zhang and Thurber, 2003) velocity structures in and around the focal area based on the travel time data collected during seismic observations. The high-velocity regions estimated by the inversion are located on the edge of the aftershock area and on the shallow part of asperity, as inferred from the slip distribution. Conversely, the Vp/Vs ratio is not always as high as that found at the location of the asperity. This finding suggests that the construction of the medium is not uniformly elastic but complex, with different relations between elastic constants and strength.",
author = "M. Hori and Satoshi Matsumoto and K. Uehira and T. Okada and T. Yamada and Y. Iio and M. Shinohara and H. Miyamachi and H. Takahashi and K. Nakahigashi and A. Watanabe and Takeshi Matsushima and N. Matsuwo and T. Kanazawa and Hiroshi Shimizu",
year = "2006",
month = "1",
day = "1",
doi = "10.1186/BF03352672",
language = "English",
volume = "58",
pages = "1621--1626",
journal = "Earth, Planets and Space",
issn = "1343-8832",
publisher = "Terra Scientific Publishing Company",
number = "12",

}

TY - JOUR

T1 - Three-dimensional seismic velocity structure as determined by double-difference tomography in and around the focal area of the 2005 West off Fukuoka Prefecture earthquake

AU - Hori, M.

AU - Matsumoto, Satoshi

AU - Uehira, K.

AU - Okada, T.

AU - Yamada, T.

AU - Iio, Y.

AU - Shinohara, M.

AU - Miyamachi, H.

AU - Takahashi, H.

AU - Nakahigashi, K.

AU - Watanabe, A.

AU - Matsushima, Takeshi

AU - Matsuwo, N.

AU - Kanazawa, T.

AU - Shimizu, Hiroshi

PY - 2006/1/1

Y1 - 2006/1/1

N2 - On March 20, 2005 the West off Fukuoka Prefecture earthquake (magnitude of 7.0 on the JMA scale) occurred in southeastern Japan. The earthquake fault was a left-lateral strike-slip having a nearly vertical fault plane and a strike in the WNW-ESE direction. The largest aftershock with a magnitude of 5.8 (JMA) followed 1 month later. To gain more detailed aftershock data, several teams from different Japanese universities jointly installed a number of temporary seismic stations and positioned Ocean Bottom Seismometers (OBSs) immediately above the focal area. Double-difference tomography was used to estimate the three-dimensional (3D) (Zhang and Thurber, 2003) velocity structures in and around the focal area based on the travel time data collected during seismic observations. The high-velocity regions estimated by the inversion are located on the edge of the aftershock area and on the shallow part of asperity, as inferred from the slip distribution. Conversely, the Vp/Vs ratio is not always as high as that found at the location of the asperity. This finding suggests that the construction of the medium is not uniformly elastic but complex, with different relations between elastic constants and strength.

AB - On March 20, 2005 the West off Fukuoka Prefecture earthquake (magnitude of 7.0 on the JMA scale) occurred in southeastern Japan. The earthquake fault was a left-lateral strike-slip having a nearly vertical fault plane and a strike in the WNW-ESE direction. The largest aftershock with a magnitude of 5.8 (JMA) followed 1 month later. To gain more detailed aftershock data, several teams from different Japanese universities jointly installed a number of temporary seismic stations and positioned Ocean Bottom Seismometers (OBSs) immediately above the focal area. Double-difference tomography was used to estimate the three-dimensional (3D) (Zhang and Thurber, 2003) velocity structures in and around the focal area based on the travel time data collected during seismic observations. The high-velocity regions estimated by the inversion are located on the edge of the aftershock area and on the shallow part of asperity, as inferred from the slip distribution. Conversely, the Vp/Vs ratio is not always as high as that found at the location of the asperity. This finding suggests that the construction of the medium is not uniformly elastic but complex, with different relations between elastic constants and strength.

UR - http://www.scopus.com/inward/record.url?scp=33947540569&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33947540569&partnerID=8YFLogxK

U2 - 10.1186/BF03352672

DO - 10.1186/BF03352672

M3 - Article

AN - SCOPUS:33947540569

VL - 58

SP - 1621

EP - 1626

JO - Earth, Planets and Space

JF - Earth, Planets and Space

SN - 1343-8832

IS - 12

ER -