An Improved Method to Compute the High-Frequency Seismograms for Near-Surface Sources, Application to the 2017 Xinmo Landslide

Session: Environmental and Near Surface Seismology: From Glaciers and Rivers to Engineered Structures and Beyond [Poster]
Type: Poster
Date: 4/29/2020
Time: 08:00 AM
Room: Ballroom
Description: 

Landslides generally induce strong ground motions and may cause huge casualties and property damage. High-frequency seismic signals generated by landslides provide an excellent opportunity to obtain the time-dependent observations on their detailed source processes. However, traditional methods based on wavenumber integration converge very slowly with sources and receivers at close or the same depths. We applied the peak-trough averaging method (PTAM) to overcome the difficulty for near-surface sources. Our method is based on the generalized reflection and transmission method (GRTM), which has the advantage of remaining stable in high frequency calculations. Our improved method provides a powerful tool to synthesize broadband seismograms in a layered half-space media for near-surface sources. We compared our method with the frequency-wavenumber (FK) method to show ours' accuracy and practicability. Finally, we applied our improved method to simulate the high-frequency seismograms of the 2017 Xinmo Landslide.

Presenting Author: Yunyi Qian

Authors