High-frequency Rayleigh-wave tomography using traffic noise from Long Beach, California

Chang, Jason P.; Ridder, Sjoerd A. L. de; Biondi, Biondo

doi:10.1190/geo-2015-0415.1

Cited by 11 publications

(7 citation statements)

References 35 publications

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“…The tomographic model shows velocity variations that are, in general, consistent with the surface wave results of Lin et al (). As expected, the most prominent feature within our model is the Newport‐Inglewood fault zone, which shows up as a high velocity anomaly (probably as a result of strain focusing; e.g., Papaleo et al, ) that emerges at depths of around 500 m. Although the average velocity structure of this feature has been imaged in previous tomography studies (e.g., Chang et al, ; Lin et al, ), the resolution that is now achieved with high‐frequency body waves allow us to illuminate some of its geometric variations. Figure shows a comparison between different cross‐sections of our velocity model cut perpendicular to the main fault trend.…”

Section: Resultssupporting

confidence: 58%

Using a Time‐Based Subarray Method to Extract and Invert Noise‐Derived Body Waves at Long Beach, California

2020

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The reconstruction of body waves from the cross‐correlation of random wavefields has recently emerged as a promising approach to probe the fine‐scale structure of the Earth. However, because of the nature of the ambient noise field, the retrieval of body waves from seismic noise recordings is highly challenging and has only been successful in a few cases. Here, we use seismic noise data from a 5,200‐node oil‐company survey to reconstruct body waves and determine the velocity structure beneath Long Beach, California. To isolate the body wave energy from the ambient noise field, we divide the entire survey into small‐aperture subarrays and apply a modified double‐beamforming scheme to enhance coherent arrivals within the cross‐correlated waveforms. The resulting beamed traces allow us to identify clear refracted P waves traveling between different subarray pairs, which we then use to construct a high‐resolution 3D velocity model of the region. The inverted velocity model reveals velocity variations of the order of 3% and strong lateral discontinuities caused by the presence of sharp geologic structures such as the Newport‐Inglewood fault (NIF). Additionally, we show that the resolution that is achieved through the use of high‐frequency body waves allows us to illuminate small geometric variations of the NIF that were previously unresolved with traditional passive imaging methods.

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Section: Resultssupporting

confidence: 58%

Using a Time‐Based Subarray Method to Extract and Invert Noise‐Derived Body Waves at Long Beach, California

2020

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“…Different studies have analyzed the seismic noise generated by railway traffic and proposed models to predict the induced vibrations 16 – 21 . Seismic sensors have also been used to monitor the vibrations generated by subway trains circulating close to historical buildings, as the Cologne Cathedral in Germany or the Bell Tower in Xi’an (China) 22 , 23 .…”

Section: Discussion On the Origin Of The Observed Seismic Signalsmentioning

confidence: 99%

Urban Seismology: on the origin of earth vibrations within a city

Díaz

Ruiz

Sánchez‐Pastor

et al. 2017

Sci Rep

111

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Urban seismology has become an active research field in the recent years, both with seismological objectives, as obtaining better microzonation maps in highly populated areas, and with engineering objectives, as the monitoring of traffic or the surveying of historical buildings. We analyze here the seismic records obtained by a broad-band seismic station installed in the ICTJA-CSIC institute, located near the center of Barcelona city. Although this station was installed to introduce visitors to earth science during science fairs and other dissemination events, the analysis of the data has allowed to infer results of interest for the scientific community. The main results include the evidence that urban seismometers can be used as a easy-to-use, robust monitoring tool for road traffic and subway activity inside the city. Seismic signals generated by different cultural activities, including rock concerts, fireworks or football games, can be detected and discriminated from its seismic properties. Beside the interest to understand the propagation of seismic waves generated by those rather particular sources, those earth shaking records provide a powerful tool to gain visibility in the mass media and hence have the opportunity to present earth sciences to a wider audience.

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“…In application to the passive data, the inherent lack of control over the location and strength of the passive sources often also results in a non-uniform illumination pattern (e.g. Walter et al 2015;Chang et al 2016). Dissipation of energy and/or deviation from a uniform illumination pattern degrade the accuracy of the retrieved Green's functions and may result in erroneous estimates of phase velocity (e.g.…”

Section: Si By Cross-correlationmentioning

confidence: 99%

Towards monitoring the englacial fracture state using virtual-reflector seismology

Lindner

Weemstra

Walter

et al. 2018

Geophysical Journal International

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High-frequency Rayleigh-wave tomography using traffic noise from Long Beach, California

Cited by 11 publications

References 35 publications

Using a Time‐Based Subarray Method to Extract and Invert Noise‐Derived Body Waves at Long Beach, California

Using a Time‐Based Subarray Method to Extract and Invert Noise‐Derived Body Waves at Long Beach, California

Urban Seismology: on the origin of earth vibrations within a city

Towards monitoring the englacial fracture state using virtual-reflector seismology

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