WITHDRAWN Magnitude Dependency of Spectral Decay Parameter (Kappa) at Rock Stations from Event Dataset that is Ristricted Only from Events that are Originated around Eastern Anatolian Fault (Eaf)
Description:
WITHDRAWN The decay of the high frequency ground motion amplitudes of Fourier spectrum, namely the spectral decay parameter, κ (kappa), is highly utilized and debated in the scientific community in the last decade due to its significant effect on earthquake hazard evaluations and results. A dataset with a good spread of magnitude variety in near site as well as far site recordings is needed to be able to check if this parameter is magnitude dependent or not. Due to paucity of data worldwide, especially hard rock sites, this dependency was not debated in full coverage, and the parameter is assumed to have the same decay tendency for high magnitude possible events with the evaluated κ values from low seismic records in the low seismic target regions. AFAD station spread around East Anatolian Fault has provided a decent dataset especially after the January 2020 Elazığ earthquake of Mw6.8, and the Mw7.7 and Mw7.6 Kahramanmaras earthquakes of February 2023. The results of these datasets are evaluated in terms of differences in different magnitude bins. Also, KOERI dataset provided a good insight on the magnitude dependency for the same region. Especially the results of AFAD Stations Stn4404 with Vs30 1380 m/s, Stn2302 and Stn2305 with Vs30 907 m/s, and Stn 2409 with Vs30 875 m/s will provide insight for low seismic, hard rock regions if only taking the low seismic data to arrive at zero epicentral spectral decay parameter, κ0 could be reasonable or not. Future investigations to account for magnitude dependency and its relations will be the next generation debate in terms of κ and hazard evaluations.
Session: Assessing Seismic Hazard for Critical Facilities and Infrastructure – Insights and Challenges [Poster Session]
Type: Poster
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Yesim
Student Presenter: No
Invited Presentation:
Authors
Yesim Biro Presenting Author Corresponding Author yesimbiro@bluewin.ch Independent consultant |
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WITHDRAWN Magnitude Dependency of Spectral Decay Parameter (Kappa) at Rock Stations from Event Dataset that is Ristricted Only from Events that are Originated around Eastern Anatolian Fault (Eaf)
Category
Assessing Seismic Hazard for Critical Facilities and Infrastructure – Insights and Challenges