• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to project page

2017 Fiscal Year Final Research Report

Comprehensive study on waveform analysis, model, and simulations for understanding the mechanism of anomalously large intensity caused by deep earthquakes

Research Project

  • PDF
Project/Area Number 26400444
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Solid earth and planetary physics
Research InstitutionThe University of Tokyo

Principal Investigator

Furumura Takashi  東京大学, 地震研究所, 教授 (80241404)

Project Period (FY) 2014-04-01 – 2018-03-31
Keywords地震 / 深発地震 / 異常震域 / MOW / 地震波伝播シミュレーション
Outline of Final Research Achievements

We examined the broadband waveform of deep-focus earthquakes occurring beneath Sea of Japan and find that the S waveforms suddenly change to show low-frequency precursor as the source depth increase over 400 km. Since it is anticipated to be occur due to the effect of wedge-shaped low-wavespeed MOW, we conducted finite-difference method simulation of seismic wave for the deep Vladivostok earthquake (578 km, Mw6.8) of 12 Feb. 2010. The result of simulation demonstrateed that the effect of low-wavespeed anomaly of MOW for guiding seismic wave in frequency between 2 to 4 Hz towards upward along the slab. Due to this, the slab-waveguide effect becomes 3 times larger than that without MOW.

Free Research Field

地震学

URL: 

Published: 2019-03-29  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi