Overview of Pre- and Post-Processing of Ambient-Noise Correlations

doi:10.1017/9781108264808.007

Cited by 5 publications

(1 citation statement)

References 57 publications

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“…After the clock correction, for continuous seismic records extracted from OBS stations, tilt and compliance noise are removed from vertical component using transfer functions constructed from the horizontal component and pressure gauge (e.g., Bell et al, 2014;Janiszewski et al, 2019;Tian & Ritzwoller, 2017). Then I apply routine two station ambient noise interferometry process (noise correlation) to both land and OBS data by following the procedures described by Bensen et al (2007) and Ritzwoller and Feng (2019). The Rayleigh wave is retrieved from the vertical-vertical (ZZ) component of the noise correlations.…”

Section: Datamentioning

confidence: 99%

Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography

Feng

2021

Geochem Geophys Geosyst

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The Alaska-Aleutian subduction zone along the southern margin of Alaska is a tectonically active region with on-going underthrusting of Pacific plate and collisional orogeny produced by the Yakutat microplate (e.g., Eberhart-Phillips et al., 2006). It is a region where North America's largest megathrust earthquakes and powerful volcanic eruptions occur. The subduction zone exhibits remarkable along-strike variations in seismicity and slip deficit; and the physical link between plate fabric, hydration, and earthquake nucleation is still a relatively open question (e.g.,

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Section: Datamentioning

confidence: 99%

Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography

Feng

2021

Geochem Geophys Geosyst

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High‐Resolution Crustal and Uppermost Mantle Structure Beneath Central Mongolia From Rayleigh Waves and Receiver Functions

Feng

2021

JGR Solid Earth

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In this study, I present a high‐resolution 3‐D Vs model of the crust and uppermost mantle beneath central Mongolia, based on seismic data recorded at the Central Mongolia Seismic Experiment array and some other networks. The model is constructed by a Bayesian Monte Carlo inversion that jointly interprets Rayleigh wave phase speeds and receiver functions. The Rayleigh wave dispersion measurements are derived from both ambient noise and teleseismic earthquake data. To improve ambient noise data coverage, a recently developed three‐station interferometry (Zhang et al., 2020, https://doi.org/10.1093/gji/ggaa046) technique is applied to produce high‐quality three‐station interferograms that augment the ambient noise data base. There are several prominent geological and tectonic features captured by the model, including (1) the Khövsgöl rift system is imaged as a high‐speed anomaly in the upper crust, whose southern edge follows the Bulnay fault. (2) The estimated crustal thickness map identifies relatively thick crust beneath the Khövsgöl rift system, the Hangay Dome, and the Gobi‐Altai Mountains. (3) A crustal high‐velocity anomaly is imaged beneath the Taryatu‐Chulutu volcanic field, which is interpreted as a solidified intrusive magma body. (4) Dispersed low‐velocity anomalies in the mantle identify locations with possible partial melting. The melting zones could be related to small‐scale asthenospheric upwelling and convective removal of lithosphere, which produces uplift of the Hangay Dome.

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Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip

et al. 2021

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Shearing along subduction zones, laboratory experiments on analogue faults, and sliding along glacier beds are all associated with aseismic and co-seismic slip. In this study, an ocean-bottom seismometer is deployed near the terminus of a Greenlandic tidewater glacier, effectively insulating the signal from the extremely noisy surface seismic wavefield. Continuous, tide-modulated tremor related to ice speed is recorded at the bed of the glacier. When noise interference (for example, due to strong winds) is low, the tremor is also confirmed via analysis of seismic waveforms from surface stations. The signal resembles the tectonic tremor commonly observed during slow-earthquake events in subduction zones. We propose that the glacier sliding velocity can be retrieved from the observed seismic noise. Our approach may open new opportunities for monitoring calving-front processes in one of the most difficult-to-access cryospheric environments.

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Overview of Pre- and Post-Processing of Ambient-Noise Correlations

Cited by 5 publications

References 57 publications

Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography

Amphibious Shear Wave Structure Beneath the Alaska‐Aleutian Subduction Zone From Ambient Noise Tomography

High‐Resolution Crustal and Uppermost Mantle Structure Beneath Central Mongolia From Rayleigh Waves and Receiver Functions

Ocean-bottom and surface seismometers reveal continuous glacial tremor and slip

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