JpGU-AGU Joint Meeting 2020

Presentation information

[E] Poster

S (Solid Earth Sciences ) » S-CG Complex & General

[S-CG61] The Japan Trench: Learning from the 2011 M=9 Tohoku-Oki earthquake, a decade later

convener:Takeshi Iinuma(National Research and Development Agency Japan Agency for Marine-Earth Science and Technology), Asuka Yamaguchi(Atomosphere and Ocean Research Institute, The University of Tokyo), Aitaro Kato(Earthquake Research Institute, the University of Tokyo), Tianhaozhe Sun(Pacific Geoscience Centre, Geological Survey of Canada)

[SCG61-P04] Modelling of spontaneous and periodic slow slip in the northern part of the Japan Trench

*Ryoko Nakata1,2, Takane Hori1, Ryota Hino2 (1.Japan Agency for Marine-Earth Science and Technology, 2.Graduate School of Science, Tohoku University)

In our previous studies, we focused the afterslip of the 2011 Tohoku-Oki earthquake, and conducted numerical simulation of earthquake generation cycles along the Japan Trench. We reflected trench-parallel remarkable difference of fault structure between the central and southern part based on marine survey and observations to spatial distribution of friction parameters of M~9 coseismic and postseismic areas. As a result, we could explain longer duration of postseismic slip in the southern part of the Japan Trench. However, we did not modeled slips in the northern part of the Japan Trench, where large coseismic slip of the Tohoku-Oki earthquake did not propagated, and slow-slips and tsunami earthquakes occur. Here, we modeled spontaneous and periodic slow slip in the northern part of the Japan Trench by using the same method. We will discuss roles of these slow slip during interseismic periods of a massive earthquake to understand physical conditions for generating a massive earthquake.