TOKACHI-OKI EQ 2003

Earthquake Research Institute, The University of Tokyo Special Event Page - 2003/09/26 Tokachi-Oki Earthquake -

[Japanese]

Overview

A strong earthquake (maximum JMA intensity is 6-, Mj 8.0) occured on 04:50, September 26, 2003(JT) at Kushiro-Oki (southeast offshore of Hokkaido). Tsunami was also observed. JMA named this earthquake "The Tokachi-Oki Earthquake in 2003".
Around the focal area, an earthquake of Mj 8.2 occured on March 4, 1952, and an earthquake of Mj 7.9 occured on May 16, 1968 at south of this area.

( From EIC Seismological Note No. 139 )

Mainshock and largest aftershock Redetermined by the ERI [Sakai] [2003/09/30 16:00]

Aftershock distribution 2003/09/26 04:50 - 14:00 (JT) [Sakai & Hagiwara] [2003/09/30 16:00]

Aftershocks and asperity [Yamanaka, Kikuchi, Sakai, & Hagiwara] [2003/10/01 22:00]

[Update 2004/03/29]

News

Coseismic and post seismic slip distribution estimated from GEONET data(in Japanese) [Kato] was released. [2003/10/14]
Links were arranged. [2003/10/09]
The statoscope data related to Tokachi-Oki Earthquake in 2003(in Japanese) [Watada] was released. [2003/10/09]
A collection of local newspaper's articles on Tsunami(in Japanese) [Tsuji] was released. [2003/10/09]
*A link to tsunami survey report of the tsunami survey group (in Japanese) was added. [2003/10/09]
*A link to the result of numerical analysis about tsunami by Tohoku University et al. was added. [2003/10/09]
Tsunami records at offshore Ofunato, iwate, observed by GPS tsunami detection system [Kato] was released. [2003/10/01]
Mainshock and largest aftershock [Sakai] and Aftershock distribution [Sakai & Hagiwara] were updated. [Original on 2003/09/29, Revised on 09/30 16:00]
Aftershocks and asperity [Yamanaka, Kikuchi, Sakai, & Hagiwara] was appeared. [2003/09/30 16:00]
Links were revised. [2003/09/30 16:00]
Tokachi-Oki earthquake in 2003 -source process, strong motion, and damages- (in Japanese) [Koketsu] was revised. [2003/09/30]
Earthquake Research Committee released Evaluation of the Tokachi-Oki Earthquake in 2003 (in Japanese). [Original on 2003/09/26, revised on 09/29]: See the site of the Headquaters for Earthquake Research Promotion.
JMA named the earthquake on 04:50, September 26 "the Tokachi-Oki Earthquake in 2003". [2003/09/26 19:00]
Tsunami hight and Tsunami magnitude[Abe] was released. [2003/09/26]
EIC Seismological Note No. 139 [Yamanaka & Kikuchi] was released. [2003/09/26]

Source Information

EIC Seismological Note No. 139: the Tokachi-Oki Earthquake in 2003 [Yamanaka & Kikuchi] [2003/09/26]

Strong motion analysis and damages

Tokachi-Oki Earthquake in 2003 -source process, strong motion, and damages- (in Japanese) [Koketsu] [Released on 2003/09/29, Revised on 2003/09/30]

Tsunami Information

Tsunami Height and Tsunami Magnitude [Abe] [2003/09/26 16:00]
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A collection of local newspaper's article on Tsunami (in Japanese) [Tsuji] [2003/10/09]

Reports of field surveys on Tsunami

*JMA released field investigation of the Tsunami (in Japanese, PDF document). [2003/09/30]
*A tsunami survey report of the tsunami survey group that consist of 13 organizations, such as Hokkaido University. (in Japanese) [2003/10/09]

Numerical analysis on Tsunami

*Disaster Control Research Center, Tohoku University [2003/10/09]
*Modeling a tsunami generated by the Tokachi-Oki Earthquake by Dr. Shun'ichi Koshimura, Disaster Reduction and Human Renovation Institute [2003/09/30]

Tsunami record observed by GPS Tsunami detection system

Tsunami record of Tokachi-Oki Earthquake in 2003 observed by GPS Tsunami detection system at offshore Ofunato city, northeastern Japan. [Kato] [2003/10/01]

Crustal Deformation Analysis

Coseismic and postseismic slip distribution estimated from GEONET data (in Japanese) [Miyazaki & Kato] [2003/10/14]

Statoscope Record

The records of statoscope related to Tokachi-Oki Earthquake in 2003 (in Japanese) [Watada] [2003/10/09]

Other Reports and Special pages

*The Headquarters for Earthquake Research Promotion :Evaluation of Off-shore Tokachi Earthquake on September 26, 2003
*Japan Meteorological Agency :"Data and Materials about Tokachi-Oki Earthquake in 2003" (in Japanese)
*National Research Institute for Earth Science and Disaster Prevention :"Special page for Tokachi-Oki Earthquake in 2003" (in Japanese)
*Geographical Survey Institute :"Crusral deformation ralated to Tokachi-Oki Earthquake in 2003" (in Japanese)
*Hydrographic and Oceanographic Department, Japan Coast Guard :"Ocean bottom topography map around the hypocenter"
*Japan Marine Science and Technology Center :"Ocean bottom seismograph observation at the next to hypocenter" (in Japanese)

*International Institute of Seismology and Earthquake Engineering, Building Research Institute :"Special page of Tokachi-Oki Earthquake of September 26, 2003"
*United States Geological Survey (USGS) :Preliminary Earthquake Report
*European Mediterranean Seismological Centre :"Page on the Japanese Earthquake September 25th, 2003"

[Earthquake Research Institute]