Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >
An interpretation of tsunami earthquake based on a simple dynamic model : Failure of shallow megathrust earthquake
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 |
URI: | http://hdl.handle.net/2115/53503 |
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
|