气候变化领域集成服务门户(CCPortal): Deep Investigations of Outer-Rise Tsunami Characteristics Using Well-Mapped Normal Faults Along the Japan Trench

CCPortal

DOI	10.1029/2020JB020060
	Deep Investigations of Outer-Rise Tsunami Characteristics Using Well-Mapped Normal Faults Along the Japan Trench
	Baba T.; Chikasada N.; Nakamura Y.; Fujie G.; Obana K.; Miura S.; Kodaira S.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	To assess the risk of tsunamis from outer-rise earthquakes, we carried out tsunami simulations using 33 simple rectangular fault models with 60° dip angles based on marine seismic observations and surveys of the Japan Trench. The largest tsunami resulting from these models, produced by a Mw 8.7 normal-faulting event on a fault 332 km long, had a maximum height of 27.0 m. We tested variations of the predictions due to the uncertainties in the assumed parameters. Because the actual dip angles of the Japan Trench outer-rise faults range from 45° to 75°, we calculated tsunamis from earthquakes on fault models with 45°, 60°, and 75° dip angles. We also tested a compound fault model with 75° dip in the upper half and 45° dip in the lower half. Rake angles were varied by ±15°. We also tested models consisting of small subfaults with dimensions of about 60 km, models using other earthquake scaling laws, models with heterogeneous slips, and models incorporating dispersive tsunami effects. Predicted tsunami heights changed by 10–15% for heterogeneous slips, up to 10% for varying dip angles, about 5–10% from considering tsunami dispersion, about 2% from varying rake angles, and about 1% from using the model with small subfaults. The use of different earthquake scaling laws changed predicted tsunami heights by about 50% on average for the 33 fault models. We emphasize that the earthquake scaling law used in tsunami predictions for outer-rise earthquakes should be chosen with great care. ©2020. The Authors.
英文关键词	earthquake scaling law; japan trench; numerical simulation; outer-rise earthquake; sensitivity test; tsunami
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187584
作者单位	Graduate School of Science and Technology, Tokushima University, Tokushima, Japan; National Research Institute for Earth Science and Disaster Resilience, Ibaraki, Japan; Research and Development Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology, Yokohama, Japan
推荐引用方式 GB/T 7714	Baba T.,Chikasada N.,Nakamura Y.,et al. Deep Investigations of Outer-Rise Tsunami Characteristics Using Well-Mapped Normal Faults Along the Japan Trench[J],2020,125(10).
APA	Baba T..,Chikasada N..,Nakamura Y..,Fujie G..,Obana K..,...&Kodaira S..(2020).Deep Investigations of Outer-Rise Tsunami Characteristics Using Well-Mapped Normal Faults Along the Japan Trench.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Baba T.,et al."Deep Investigations of Outer-Rise Tsunami Characteristics Using Well-Mapped Normal Faults Along the Japan Trench".Journal of Geophysical Research: Solid Earth 125.10(2020).