WITHDRAWN 2020 National Seismic Hazard Model of Norway
Description:
WITHDRAWN The purpose of a national seismic hazard model is to provide an estimate of the likelihood and strength of earthquake ground shaking that might occur at any given site in Norway. To provide this information about how different parts of the country might behave in the event of larger magnitude earthquakes, the database and the computational methods applied should be continuously updated. In Norway, this was not the case, where the last national seismic hazard model was developed in 1998, based on limited data and outdated methodology. Other following studies were only conducted on the European-scale level, and the details of Norwegian earthquake catalogues were never integrated sufficiently. Therefore, NORSAR developed in 2020 a new national seismic hazard model based on 20 more years of data, including for the first time the arctic region of Svalbard, and using new state-of-the-art methodology.
The Probabilistic Seismic Hazard Analysis applied the CRISIS software package and combined in a logic-tree approach three different zonation models that are based on seismicity patterns, and extent and presence of active and passive faults. In addition, one zonation-free approach was incorporated, where earthquake activity rates were extracted on a regular grid. Earthquake recurrence parameters for each zone were obtained from direct magnitude-frequency analysis using an earthquake catalogue homogenized to Mw estimates (from 1497 to 2018). Four suitable Ground Motion Prediction Equations (GMPEs) have been used and all results are evaluated at relevant Norwegian bedrock conditions using a reference shear wave velocity equal to 1200 m/s. The results are provided in terms of Peak Ground Acceleration (PGA) and several Spectral Acceleration (SA) periods for 475, 2475 and 10.000 years for Norway mainland and Svalbard. These results are particularly useful to the engineering community and as basis for design constructions in accordance with Eurocode 8 standards.
Session: Advances in Probabilistic Seismic Hazard Analysis and Applications
Type: Oral
Date: 4/19/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Volker Oye
Student Presenter: Yes
Invited Presentation:
Authors
Federica Ghione Corresponding Author federica@norsar.no Norwegian Seismic Array |
Volker Oye Presenting Author volker@norsar.no Norwegian Seismic Array |
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WITHDRAWN 2020 National Seismic Hazard Model of Norway
Category
Advances in Probabilistic Seismic Hazard Analysis and Applications