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An interpretation of tsunami earthquake based on a simple dynamic model : Failure of shallow megathrust earthquake

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Title: An interpretation of tsunami earthquake based on a simple dynamic model : Failure of shallow megathrust earthquake
Authors: Mitsui, Yuta Browse this author →KAKEN DB
Yagi, Yuji Browse this author
Keywords: The 2011 Tohoku earthquake
Tsunami earthquake
Megathrust earthquake
Dynamic rupture simulation
Thermal pressurization
Numerical experiment
Issue Date: 28-Apr-2013
Publisher: Wiley-Blackwell
Journal Title: Geophysical Research Letters
Volume: 40
Issue: 8
Start Page: 1523
End Page: 1527
Publisher DOI: 10.1002/grl.50266
Abstract: The 2011 Tohoku earthquake demonstrated that extremely large seismic slip can occur at shallow plate interfaces in subduction zones. The large slip area for the Tohoku earthquake included the source region of a tsunami earthquake. We performed dynamic rupture simulations using simplified fault models and the mechanism of thermal fluid pressurization. We found that small fluctuations of initial shear stress near a trench, within 1 MPa, lead to differences in seismic moment release greater than two orders of magnitude. In addition, we performed another experiment varying rupture nucleation sizes and obtained similar acute sensitivities of parameters. Moderate slip events with trapezoidal (flat‒topped) source time functions appear to occupy a transition position, between shallow megathrust earthquakes with surface rupture and smaller ordinary earthquakes without surface rupture. We interpret this result as representing the differences in interplate slip between shallow megathrust earthquakes, tsunami (moderate) earthquakes, and non‒tsunami (ordinary) earthquakes, on the basis of seismic observations.
Rights: Copyright 2013 American Geophysical Union
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 三井 雄太

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