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A list of all the posts and pages found on the site. For you robots out there is an XML version available for digesting as well.
Pages
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Posts
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portfolio
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publications
Usage of directional common image gathers for shallow seismic source localization
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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Shallow diffraction imaging in an SH-wave crosshole configuration
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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Seismic velocity estimation using time-reversal focusing
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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Q-factor inversion using reconstructed source spectral consistency
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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Velocity analysis and subsurface source location improvement using moveout-corrected gathers
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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Seismic velocity estimation using passive downhole distributed acoustic sensing records–examples from the San Andreas Fault Observatory at Depth
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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DAS observations and modeling of perforation-induced guided waves in a shale reservoir
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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Velocity-Based Earthquake Detection Using Downhole Distributed Acoustic Sensing—Examples from the San Andreas Fault Observatory at Depth
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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Fiber-optic distributed seismic sensing data generator and its application for training classification nets
Published in Optics Letters, 2020
Training a DAS classifier using synthetic data generated geophysical seismic modeling.
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Comparison between Distributed Acoustic Sensing and Geophones: Downhole Microseismic Monitoring of the FORGE Geothermal Experiment
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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Near-surface Characterization Using a Roadside Distributed Acoustic Sensing Array
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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Fracture properties estimation using distributed acoustic sensing recording of guided waves in unconventional reservoirs
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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City-scale dark fiber DAS measurements of infrastructure use during the COVID-19 pandemic
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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Low-magnitude Seismicity with a Downhole Distributed Acoustic Sensing Array – examples from the FORGE Geothermal Experiment
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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talks
Shallow Seismic Source Localization
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Seismic velocity estimation and earthquake detection using downhole DAS - examples from SAFOD
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Seismic velocity estimation and earthquake detection using downhole DAS - examples from SAFOD
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A moveout-based method for the detection of weak seismic events using downhole DAS arrays
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Downhole seismic sensing using fibers (DAS)
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Downhole DAS Observation of Guided Wavesin a Shale Reservoir Generated by Perforation Shots
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teaching
Introduction to Continuum Mechanics - Solids, Lecturer
3rd Year Undergraduate, Tel Aviv University, 2014
Introduction to Continuum Mechanics - Solids, Lecturer
3rd Year Undergraduate, Tel Aviv University, 2015
Introduction to Continuum Mechanics - Solids, Lecturer
2nd Year Undergraduate, Tel Aviv University, 2016
Introduction to Continuum Mechanics - Solids, Lecturer
2nd Year Undergraduate, Tel Aviv University, 2017