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WITHDRAWN Single-Station Microtremor HVSR Curve Inversion and Ambient Noise Tomography of the Three-Component Seismic Data From a Nodal Array in Downtown Reno, Nevada

Description: 

WITHDRAWN An accurate quantitative representation of subsurface features and velocity structure at the basin scale is essential in successfully predicting strong ground motions and assessing site amplification responses in sedimentary basins. This improved understanding is advantageous to better address earthquake hazard mitigation in urban centers such as the Reno basin. Single station microtremor horizontal to vertical spectral ratio (HVSR) inversion is a helpful technique for producing one-dimensional (1D) velocity structures using a single three-component seismic node recording ambient acoustic emissions due to natural and anthropogenic sources. The usefulness of the single-station HVSR inversion technique particularly holds in urban centers, where deploying a linear nodal array, as in the refraction microtremor technique, may be logistically challenging. Furthermore, the first and second peak amplitude and frequency of the HVSR curve provide relevant information on site fundamental frequency, impedance contrasts, and depth to bedrock.
To better understand the capabilities of the single-station microtremor HVSR curve inversion technique and improve current understanding of the subsurface Reno basin structure, a large-scale ambient noise data gathering effort was undertaken with several three-component nodes scattered across the city of Reno, Nevada. The ambient noise recording was conducted over two weeks. The extracted ambient noise data was used to generate HVSR curves for each station separately to provide several 1D velocity profiles of the subsurface structure. The generated 1D velocity profiles are interpolated to provide a three-dimensional rendering of the subsurface velocity variations. An ambient noise tomography using dispersion curve inversion of surface waves is also performed and compared to the HVSR curve inversion.

Session: Single-station Passive Exploration Methods: Status and Perspectives

Type: Oral

Date: 4/18/2023

Presentation Time: 04:45 PM (local time)

Presenting Author: Majid Mirzanejad

Student Presenter: No

Invited Presentation: 

Authors