You can also find my articles/abstracts at Google Scholar.
Published in Journal of Geophysical Research: Solid Earth [Under Review], 2020
Using a downhole vertical DAS array, we detect natural and induced earthquakes with a magnitude completeness better by M = 1 compared to a dense surface seismometer array.
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Published in Geophysical Research Letters [Under Review], 2020
We measure the effect of COVID-19 on vehicle usage using DAS recordings near Stanford.
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Published in Geophysics [Accepted], 2020
DAS can record high-frequency guided waves excited by perforation shots and propagating in a low velocity shale reservoir. Using a cross-well setup, we can infer stimulation-induced horizontal fracture growth by its effect on guided waves.
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Published in The Leading Edge [Accepted], 2020
Using DAS recording of the ambient seismic field generated by cars and earthquakes, we estimate the S-wave velocity profile and Poisson ratio along the array.
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Published in Seismological Research Letters [Accepted], 2020
A downhole vertical DAS array is compared with a set of standard geophones in analyzing microseismic events generated during stimulation of the DoE FORGE geothermal project.
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Published in Optics Letters, 2020
Training a DAS classifier using synthetic data generated geophysical seismic modeling.
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Published in Bulletion of the Seismological Society of America, 2019
Using a vertical DAS array, we demonstrate the usefeulness of a velocity-based earthquake detection algorithm.
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Published in The Leading Edge, 2019
Perforation shots conducted in unconventional reservoirs excite guided waves that propagate through the low-velocity shale formation. These waves are recorded by a downhole DAS array and have a wide frequency content. In a cross-well acquisition, guided S-waves are disturbed when propagating through previously stimulated areas.
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Published in Journal of Geophysical Research: Solid Earth, 2019
Optical fiber recording (DAS) of earthquakes in a downhole array allows the building of high-resolution P and S velocity models, unveiling local geology and in agreement with a conventional geophone survey
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Published in Geophysics, 2019
Subsurface sources of known location can be used for velocity model calibration. We show how to conduct this procedure without the need for picking by using moveout corrected gathers.
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Published in Geophysics, 2018
We utilize a physical objective function for Q-factor inversion. Assuming correct velocity and attenuation models, back-propagation of recorded data should have the same spectral content at the source location. This property is used in a global optimization scheme, allowing for high-resolution Q-model recovery.
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Published in Geophysics, 2018
We utilize the time-reversal principle for seismic velocity inversion. Recorded data are computationally back-propagated through various velocity models. When the model is correct, energy will be focused at the true source location and origin time.
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Published in Geophysics, 2017
We show the advantages of using a pure SH-waves cross-hole acquisition for diffraction imaging. After implementing an automatic model-based direct-waves muting, we migrate diffracted events to a depth imaging offset domain. In it, gathers will be flat only if estimated diffractor location and velocity model are correct.
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Published in Near Surface Geophysics, 2016
In this paper, we explore using multi-parameter common image gathers (MPCIGs) as a tool for event location. When both estimated event location and used velocity model are correct, the MPCIGs will have no residual moveout. We explore the usage of such gathers for a one-way migration, with unknown source location and origin time.
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