Publication Date:
2023-07-11
Description:
To estimate a potential source fault after an earthquake is important for seismic hazard assessment (e.g., FinDer). Using pre-calculated ground motion time histories will be useful for earthquake evaluation to grasp which scenario earthquakes are similar to each other within a few hours to half a day when an earthquake occurs. We develop a method to compare observed ground motions by NIED K-NET/KiK-net with simulated ground velocities from the NIED J-SHIS database that for the Scenario Seismic Hazard Maps in the National Seismic Hazard Maps 2020, targeting active faults in Japan. Based on the comparison of velocity ground motion time histories with a 0.1-1 Hz band-pass filter, cross-correlation coefficients with/without amplitude normalization were obtained, and scenario fault candidates were ranked. We applied this method to the 2016 Kumamoto earthquake sequence. The fault selection for the foreshock worked well, supporting the proposed method. However, the mainshock did not select the ruptured fault identified by the ground truth. One of the reasons is the different dominant frequency between the observation and pre-calculated ground velocities, indicating the necessity of further adjustment.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
