ML24292A154
| ML24292A154 | |
| Person / Time | |
|---|---|
| Issue date: | 10/21/2024 |
| From: | Vladimir Graizer, Scott Stovall NRC/RES/DE |
| To: | |
| Thomas Weaver 301-415-2383 | |
| Shared Package | |
| ML24292A135 | List: |
| References | |
| Download: ML24292A154 (1) | |
Text
Global GS24 Ground Motion Models for the Active Crustal Regions based on Non-Traditional Modeling Approach
Vladimir Graizer and Scott Stovall
U.S. Nuclear Regulatory Commission
Vladimir.Graizer@nrc.gov
Abstract
Ground motion models (GMMs) also called ground motion prediction equations (GMPEs), and attenuation relations, use datasets of recorded ground motion parameters at multiple seismic stations during different earthquakes and in various source regions to generate equations that are later used to estimate site-specific ground motions that may occur at a site if an earthquake of a certain magnitude occurs at a nearby location. These models describe the distribution of ground motion in terms of a median and a logarithmic standard deviation and are crucial in assessing seismic hazard, thereby providing estimates of the loading that a structure may undergo during a future earthquake. An expanded Pacific Earthquake Engineering Research (PEER) Center Next Generation Attenuation Phase 2 (NGA -West2) ground motion database developed from shallow crustal earthquakes in active crustal regions (ACR) is used to develop GS24b and GS24 ground motion models (GMM) for the average (RotD50) horizontal components of peak ground acceleration (), peak ground velocity ( ) and 5% damped elastic pseudo-absolute acceleration response spectral ordinates ( ) at 21 oscillator periods (T) ranging from 0.01 to 10 s. NGA-West2 dataset was expanded with recordings from the three 2023 Turkish earthquakes with moment magnitudes of 6.3, 7.5 and 7.8 (Buckreis et al., 2023a).
We developed the backbone GS24b model that uses the closed form approximation of the spectral acceleration as a multiplication of the and spectral shape (normalized spectral acceleration spectrum) functions and the global GS24 model representing the backbone GS24b GMM adjusted for residuals from multiple ACR regions. The new GS24b and GS24 models are developed using non-traditional approach to ground motion modeling developed by Graizer and Kalkan (2007 and 2009). Models are applicable to earthquakes with 4.0 8.5, at rupture distances of 0 400 km, at sites having time-a veraged shear wave velocity in the upper 30 meters of the profile 30 in the range from 150 m/sec to 1500 m/sec, and for periods ( T) ranging from 0.01 to 10 sec. As compared to the GK17 (Graizer, 2018) the new model includes sediment thickness 2. 5 depth (basin effect) correction and calculations.