Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake

Abstract

Stressed Out Large seismic events such as the 2011 magnitude 9.0 Tohoku-Oki earthquake can have profound effects not just on the severity of ground motion and tsunami generation, but also on the overall state of the crust in the surrounding regions. Lin et al. (p. 687 ) analyzed the stress 1 year after the Tohoku-Oki earthquake and compared it with the estimated stress state before the earthquake. In situ resistivity images were analyzed from three boreholes drilled into the crust across the plate interface where the earthquake occurred. Stress values indicate a nearly complete drop in stress following the earthquake such that the type of faulting above the plate boundary has changed substantially. These findings are consistent with observations that the sea floor moved nearly 50 meters during the earthquake.

Autoren

Weiren Lin
Marianne Conin
J Casey Moore
Frederick M Chester
Yasuyuki Nakamura
James J Mori
Louise Anderson
Emily E Brodsky
Nobuhisa Eguchi
Becky Cook
Tamara Jeppson
Monica Wolfson-Schwehr
Yoshinori Sanada
Saneatsu Saito
Yukari Kido
Takehiro Hirose
Jan H Behrmann
Matt Ikari
Kohtaro Ujiie
Christie Rowe
James Kirkpatrick
Santanu Bose
Christine Regalla
Francesca Remitti
Virginia Toy
Patrick Fulton
Toshiaki Mishima
Tao Yang
Tianhaozhe Sun
Tsuyoshi Ishikawa
James Sample
Ken Takai
Jun Kameda
Sean Toczko
Lena Maeda
Shuichi Kodaira
Ryota Hino
Demian Saffer

DOI

10.1126/science.1229379

eISSN

1095-9203

ISSN

0036-8075

Ausgabe der Veröffentlichung

6120

Zeitschrift

Science

Sprache

en

Paginierung

687 - 690

Datum der Veröffentlichung

2013

Status

Published

Herausgeber

American Association for the Advancement of Science (AAAS)

Herausgeber URL

http://dx.doi.org/10.1126/science.1229379

Datum der Datenerfassung

2024

Titel

Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake

Ausgabe der Zeitschrift

339

Datenquelle: Crossref

Abstract

The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic slip of more than 50 meters near the Japan trench, which could result in a completely reduced stress state in the region. We tested this hypothesis by determining the in situ stress state of the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately 1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of the horizontal stress orientations and magnitudes estimated from borehole breakouts and the increase in coseismic displacement during propagation of the rupture to the trench axis, in situ horizontal stress decreased during the earthquake. The stress change suggests an active slip of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly total stress drop.

Addresses

Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Nankoku, Japan. lin@jamstec.go.jp

Autoren

Weiren Lin
Marianne Conin
J Casey Moore
Frederick M Chester
Yasuyuki Nakamura
James J Mori
Louise Anderson
Emily E Brodsky
Nobuhisa Eguchi
Expedition 343 Scientists

DOI

10.1126/science.1229379

eISSN

1095-9203

Externe Identifier

PubMed Identifier: 23393262

Funding acknowledgements

Natural Environment Research Council: NE/K00123X/1

Open access

false

ISSN

0036-8075

Ausgabe der Veröffentlichung

6120

Zeitschrift

Science (New York, N.Y.)

Schlüsselwörter

Expedition 343 Scientists

Sprache

eng

Medium

Print

Paginierung

687 - 690

Datum der Veröffentlichung

2013

Status

Published

Datum der Datenerfassung

2013

Titel

Stress state in the largest displacement area of the 2011 Tohoku-Oki earthquake.

Sub types

Research Support, Non-U.S. Gov't
Journal Article

Ausgabe der Zeitschrift

339

Datenquelle: Europe PubMed Central

Abstract

The 2011 moment magnitude 9.0 Tohoku-Oki earthquake produced a maximum coseismic slip of more than 50 meters near the Japan trench, which could result in a completely reduced stress state in the region. We tested this hypothesis by determining the in situ stress state of the frontal prism from boreholes drilled by the Integrated Ocean Drilling Program approximately 1 year after the earthquake and by inferring the pre-earthquake stress state. On the basis of the horizontal stress orientations and magnitudes estimated from borehole breakouts and the increase in coseismic displacement during propagation of the rupture to the trench axis, in situ horizontal stress decreased during the earthquake. The stress change suggests an active slip of the frontal plate interface, which is consistent with coseismic fault weakening and a nearly total stress drop.

Autoren

Weiren Lin
Marianne Conin
J Casey Moore
Frederick M Chester
Yasuyuki Nakamura
James J Mori
Louise Anderson
Emily E Brodsky
Nobuhisa Eguchi
Expedition 343 Scientists

Autoren-URL

https://www.ncbi.nlm.nih.gov/pubmed/23393262

DOI

10.1126/science.1229379

eISSN

1095-9203

Ausgabe der Veröffentlichung

6120

Zeitschrift

Science

Sprache

eng

Country

United States

Paginierung

687 - 690

PII

339/6120/687

Datum der Veröffentlichung

2013

Status

Published

Datum, an dem der Datensatz öffentlich gemacht wurde

2013

Titel

Stress state in the largest displacement area of the 2011 Tohoku-Oki earthquake.

Sub types

Journal Article
Research Support, Non-U.S. Gov't

Ausgabe der Zeitschrift

339

Datenquelle: PubMed

Stress State in the Largest Displacement Area of the 2011 Tohoku-Oki Earthquake

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