Coordinated National Seismic Hazard Assessments for Tajikistan, Kyrgyzstan and Kazakhstan
Description:
Probabilistic seismic hazard assessments (PSHA) were undertaken in Tajikistan, Kyrgyzstan and Kazakhstan by local agencies with the coordination and support of the Lawrence Livermore National Laboratory. The study included a regional bulletin unification effort that collected and digitized all paper-based seismic bulletins in the countries’ archives as well as compiling all available digital data in a single database. The earthquake catalogue resulting from this effort was further processed for PSHA purposes including improvements in earthquake magnitudes and locations, removal of 72,000 non-tectonic events, magnitude harmonization and determination of completeness intervals. Two versions of the PSHA-ready catalogue were generated, one with declustering and one without. In addition, an inventory of known active faults was compiled along with their estimated slip rates. Source characterization utilized both these datasets. For the ground motion characterization, all recorded strong motion data from past events in the region was collected from various agencies, some of which also had to be digitized. Contemporary ground motion models (GMMs) from US, Japan, Europe and Middle East were tested against the recorded data, which allowed determination of the GMMs to use along with their logic-tree weights. Each country worked on their national models, and these were harmonized at the borders. In addition to each individual country’s models, a regional model was developed as an alternate model, and used in a logic-tree fashion with 50%-50% weights. The results presented here are currently being considered by the engineering community in these countries for use in the building code modernization that is much needed in the region.
Session: Advances in Probabilistic Seismic Hazard Analysis and Applications [Poster]
Type: Poster
Date: 4/20/2023
Presentation Time: 08:00 AM (local time)
Presenting Author: Tuna Onur
Student Presenter: No
Invited Presentation:
Authors
Tuna Onur Presenting Author Corresponding Author tuna@onurseemann.com Onur Seemann Consulting, Inc. |
Rengin Gok gok1@llnl.gov Lawrence Livermore National Laboratory |
Anna Berezina annaberezina8@gmail.com Institute of Seismology NAS KR |
Anatoly Ischuk anatoly.ischuk@gmail.com Institute of Geology, Earthquake Engineering and Seismology, NAS RT |
Natalya Silacheva silacheva_nat@mail.ru Institute of Seismology, NAS RK |
Carlos Herrera carlos@onurseemann.com Onur Seemann Consulting, Inc. |
Kanatbek Abrakhmatov kanab53@yandex.ru Institute of Seismology, NAS KR |
Natalya Mikhailova mikhailova@kndc.kz Institute of Geophysical Research, NNC RK |
Andrea Chiang chiang4@llnl.gov Lawrence Livermore National Laboratory |
Coordinated National Seismic Hazard Assessments for Tajikistan, Kyrgyzstan and Kazakhstan
Category
Advances in Probabilistic Seismic Hazard Analysis and Applications