Resolving Temporal Variations in Subsurface Velocity and Attenuation Structure Across the Taklimakan Desert Using Road Traffic Seismic Signals
Description:
Monitoring temporal changes in subsurface structure is crucial for interpreting how the Earth's media interacts with factors such as temperature, fluids, and stress. In this study, we resolve the temporal variation of velocity and attenuation in the Taklimakan Desert using traffic-induced ground motions recorded by three broadband seismographs located near highways. We first compute the H/V spectral ratios of the 3-component data and track the swings of the peaks and valleys to estimate the velocity changes. To characterize Q-values, we then model the vertical spectra of ballistic waves generated by massive road traffic events. The results reveal temporal variations in the sand subsurface, with velocity changing by up to 4% and Q-value by up to 10% in the frequency band of 10-45 Hz. These changes show a positive correlation with seasonal temperature fluctuations but are negatively modulated by local precipitation with negligible lags. This suggests that changes in the cohesion of the shallow sand layer are primarily induced by thermoelastic strain and fluid effects.
Session: ESC-SSA Joint Session: Climate Change and Environmental Seismology [Poster Session]
Type: Poster
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Lulu
Student Presenter: Yes
Invited Presentation:
Authors
Lulu Zhao Presenting Author zhaolulu3jlu@163.com Chinese Academy of Science |
Haoran Meng menghr@sustech.edu.cn Southern University of Science and Technology |
Xiaofeng Liang Corresponding Author liangxf@mail.iggcas.ac.cn Chinese Academy of Science |
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Resolving Temporal Variations in Subsurface Velocity and Attenuation Structure Across the Taklimakan Desert Using Road Traffic Seismic Signals
Category
ESC-SSA Joint Session: Climate Change and Environmental Seismology