Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-SS Seismology

[S-SS25] Strong Ground Motion and Earthquake Disaster

Tue. May 24, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

Convener:*Seiji Tsuno(Railway Technical Research Institute)

5:15 PM - 6:30 PM

[SSS25-P06] Study on spectral decay characteristics in high frequency range using parameter κ - For crustal earthquakes -

*Masato Tsurugi1, Takao Kagawa2, Kojiro Irikura3 (1.Geo-Research Institute, 2.Tottori University, 3.Aichi Institute of Technology)

Keywords:Spectral decay characteristics, Kappa, fmax filter, Crustal earthquakes

Spectral decay parameters κ and fE due to crustal earthquakes are estimated in this study. In high frequency range spectra of S-wave accelerations are generally characterized by a trend of exponential decay, e-πfκ (f>fE), while they are modeled with fmax filter in Japanese applications.
The κ’s of the three large earthquakes are estimated in the range 0.0142 and 0.0277 and fE’s are estimated in the range 2Hz and 5Hz for the mainshocks of the 2003 Miyagi-ken Hokubu earthquake, the 2005 Fukuoka-Ken Seiho-oki earthquake, and the 2008 Iwate Miyagi Nairiku earthquake. The relationship between κ and the power coefficient of fmax filter, s, and the relationship between fE and fmax are evaluated from the results. Moreover, hypocentral distance dependency of κ is confirmed as demonstrated by previous studies.