Time-Domain Seismic Response Retrieval from Ambient Noise Recorded by the Existing Seismometer of Dams Based on Interferometric Processing
Description:
The seismometers installed at dams in Japan have recorded numerous seismic events, including significant earthquakes. These records are invaluable for analyzing the response of dams during seismic activities, providing insights into their behavior and allowing for the derivation of indices reflecting the dynamic properties of the structures. Applying the principles of seismic interferometry, we employed its methods to the seismic records of dams, estimating both the properties of seismic wave propagation and the dynamic characteristics of the structures.
In this presentation, we assess the applicability of seismic interferometry to the seismic records of dams, specifically its use with small vibration records obtained from existing dam seismometers. These records encompass data from minor earthquakes, where the maximum acceleration is less than 1 cm/s², as well as ambient noise expected to include waveforms of latent micro-tremors. Through waveform analysis spanning over 10 hours, we demonstrate the capability to extract time-domain response waveforms from the records of small vibrations resembling those obtained from seismic records of significant earthquakes (maximum acceleration exceeding 2 cm/s²). Importantly, these results highlight the potential for interferometric processing to be consistently applied, not only to seismic events but also to seemingly trivial records, such as ambient noise. This aspect has traditionally been overlooked by the existing seismometers of dams are primarily designed to measure seismic waves with strong amplitudes. We will also present a case study involving recent significant earthquake events.
Session: Assessing Seismic Hazard for Critical Facilities and Infrastructure – Insights and Challenges [Poster Session]
Type: Poster
Date: 5/3/2024
Presentation Time: 08:00 AM (local time)
Presenting Author: Seiichiro
Student Presenter: No
Invited Presentation:
Authors
Seiichiro Kuroda Presenting Author Corresponding Author skuroda@affrc.go.jp National Agriculture and Food Research Organization |
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Time-Domain Seismic Response Retrieval from Ambient Noise Recorded by the Existing Seismometer of Dams Based on Interferometric Processing
Category
Assessing Seismic Hazard for Critical Facilities and Infrastructure – Insights and Challenges