Ambient noise Love wave attenuation tomography for the LASSIE array across the Los Angeles basin

Abstract

The Los Angeles basin is located within the North America–Pacific plate boundary and contains multiple earthquake faults that threaten greater Los Angeles. Seismic attenuation tomography has the potential to provide important constraints on wave propagation in the basin and to provide supplementary information on structure in the form of the distribution of anelastic properties. On the basis of the amplitude information from seismic interferometry from the linear LASSIE array in the Los Angeles basin, we apply station-triplet attenuation tomography to obtain a 2D depth profile for the attenuation structure of the uppermost 0.6 km. The array crosses four Quaternary faults, three of which are blind. The attenuation tomography resolves strong attenuation (shear attenuation Qs ~ 20) for the fault zones and is consistent with sharp boundaries across them.

Fault Zone Imaging With Distributed Acoustic Sensing: Surface‐To‐Surface Wave Scattering

“…Earthquake locations and focal mechanisms shed light on fault locations and structural complexities (Ross et al., 2017; Wang & Zhan, 2020). Seismic tomography can produce images of seismic velocity and attenuation near a fault zone (e.g., Allam et al., 2014; Liu et al., 2021; Wang et al., 2019). Fault zone trapped waves recorded by the sensors within the fault zones can be used to model fault zone geometries and properties in detail (e.g., Lewis et al., 2007; Li & Malin, 2008; Li et al., 2004).…”

Fault Zone Imaging with Distributed Acoustic Sensing: Surface-to-Surface Wave Scattering

“…Earthquake locations and focal mechanisms shed light on fault locations and structural complexities (Ross et al, 2017;Wang & Zhan, 2020). Seismic tomography can produce images of seismic velocity and attenuation near a fault zone (e.g., Allam et al, 2014;Liu et al, 2021;. Fault zone trapped waves recorded by the sensors within the fault zones can be used to model fault zone geometries and properties in detail (e.g., Lewis et al, 2007;Li et al, 2004;Li & Malin, 2008).…”

Ambient Noise Attenuation Tomography Reveals an Asymmetric Damage Zone Across San Jacinto Fault Near Anza, California

“…The uncertainties for Rayleigh and Love wave attenuation are shown in Figure S3 of Supporting Information S1 following the steps in X. Liu et al, 2021.…”

“…For the causal part of noise cross-correlation functions, the noise sources in the western Fresnel zone interfere constructively and we take the amplitude ratio of station pairs 1-3 and 1-2 (X. Liu et al, 2021),…”

“…In this paper, we combine the ambient noise attenuation inversion technique using linear triplets of stations (X. Liu et al, 2015;Allmark et al, 2018;X. Liu et al, 2021) with imaging of shear velocity cross sections to delineate the damage zone structure across the Clark Fault strand beneath the RR array.…”