速度・状態依存摩擦則を用いた地震サイクル計算に おける dip angle および動的応力伝播の効果
著者 三井 雄太
雑誌名 静岡大学地球科学研究報告
巻 41
ページ 1‑6
発行年 2014‑07
出版者 静岡大学地球科学教室
URL http://doi.org/10.14945/00007893
速度・状態依存摩擦則を用いた地震サイクル計算における dip angleおよび動的応力伝播の効果
三井雄太
1
Effects of dip angle and dynamic stress transfer in long-term fault slip simulation using the rate and state friction
Yuta M
ITSUI 1
Abstract Numerical model of long-term fault slip (earthquake cycle) simulation had been initially developed with a 90-degree dip angle to the free surface, neglecting dynamic stress transfer. At pres- ent we can implement either effect of lower dip angle or the dynamic stress transfer into the model, but mounting both effects is still difficult. Here we perform numerical experiments of the earthquake cycle model to compare the dip-angle effect with the dynamic effect. Qualitatively, both prolong earth- quake recurrence interval by enlarging event magnitude. We find that the effect of the low dip angle can be greater than the dynamic stress transfer when the dip angle is as small as actual subduction plate interface. This tendency is stronger as seismic area is shallower.
Keywords: rate and state friction, earthquake cycle, dynamic stress transfer, dip angle, free surface
1
静岡大学理学研究科地球科学教室,〒422–8529 静岡市駿河区大谷836
1