|
|||||
|
|
Finite Difference Simulations of Seismic Wave Propagation for the 2007 Mw 6.6 Niigata-ken Chuetsu-Oki Earthquake: Validity of Models and Reliable Input Ground Motion in the Near-Field |
|
| Authors: | Hideo Aochi Ariane Ducellier Fabrice Dupros Mickael Delatre Thomas Ulrich Florent de Martin Masayuki Yoshimi |
| Institution: | 1. Natural Risks and CO2 Storage Safety Division, Bureau de Recherches Géologiques et Minières, Orléans, France 2. Digital Information Services, Bureau de Recherches Géologiques et Minières, Orléans, France 3. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan |
| Abstract: | Finite difference simulations of seismic wave propagation are performed in the Niigata area, Japan, for the 2007 Mw 6.6 Niigata-ken Chuetsu-Oki earthquake at low frequencies. We test three 3D structural models built independently in various studies. First aftershock simulations are carried out. The model based on 3D tomography yields correct body waves in the near field, but later phases are imperfectly reproduced due to the lack of shallow sediment layers; other models based on various 1D/2D profiles and geological interpretation provide good site responses but generate seismic phases that may be shifted from those actually observed. Next, for the mainshock simulations, we adopt two different finite source models that differ in the near-field ground motion, especially above the fault plane (but under the sea) and then along the coastline. Each model is found to be calibrated differently for the given stations. For engineering purposes, the variations observed in simulated ground motion are significant, but for seismological purposes, additional parameter calibrations would be possible for such a complex 3D case. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |