Monitoring Temporal Velocity Variations of Shallow Subsurface and Engineering Structures Using 6c Single-Station Measurement
Description:
Monitoring seismic velocity variations offers valuable insights into near-surface processes like soil compaction and groundwater changes, aiding environmental studies. In engineering, these variations can indicate structural damage in buildings, bridges, dams, and tunnels. Continuous monitoring helps identify potential risks, enabling preventive maintenance and ensuring safety and resilience of structures. In this study, we propose a six-component (6C) single-station measurement. The proposed method relies on the joint analysis of translational and rotational ground motion recordings obtained from a collocated seismometer and rotational sensor. This innovative approach merges the capabilities of a small-scale seismic array with the cost-efficiency of single-station surface measurements. It enables the extraction of seismic velocities from both active and passive seismic sources. Unlike cross-correlation-based seismic interferometry methods, such as ambient noise tomography, the proposed measurement does not rely on the theoretical assumption of the equipartition of noise sources, which is normally not satisfied in practice. More significantly, the used amplitude-ratio-based algorithm for proposed measurement will suppress the influence of seismic sources and mitigate the wave propagation effects, making the method more sensitive to near-receiver subsurface structures. The proposed measurement ensures near-receiver sensitivity and repeatability, allowing for the detection of small perturbations in the subsurface and engineering structure properties even in dynamic environments with changing noise sources. As a result, the proposed measurement is well-suited for monitoring site-specific seismic velocity variations. We verified the efficacy of the proposed 6C measurement through both synthetic and real-world examples, including near-surface and engineering applications.
Session: From Earthquake Recordings to Empirical Ground-Motion Modelling [Poster Session]
Type: Poster
Date: 5/2/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Shihao
Student Presenter: No
Invited Presentation:
Authors
Shihao Yuan Presenting Author Corresponding Author syuan@mines.edu Colorado School of Mines |
Eileen Martin eileenrmartin@mines.edu Colorado School of Mines |
Felix Bernauer felix.bernauer@lmu.de Ludwig-Maximilians-Universität München |
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Monitoring Temporal Velocity Variations of Shallow Subsurface and Engineering Structures Using 6c Single-Station Measurement
Category
From Earthquake Recordings to Empirical Ground-Motion Modelling