Browsing Fakultet for informasjonsteknologi og elektroteknikk (IE) by Journals "Geophysical Journal International"
Now showing items 1-6 of 6
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Characterizing the acoustic properties of the cavity cloud generated close to an air-gun array as a time-dependent effective medium
(Journal article, 2018)A ghost cavity cloud consists of many small vapour cavities and appears above and around the air-guns in the source array a few milliseconds after the source is fired. Since there are dissolved gases and stable microbubbles ... -
Diving-wave time-lapse delay for CO2 thin layer detection
(Peer reviewed; Journal article, 2024)We have derived an analytical approximate expression to estimate the delay in diving seismic waves due to thin layers of CO2. The expression is valid for high frequencies and can be used to estimate the delay in diving ... -
Frequency-depth-dependent spherical reflection response from the sea surface - a transmission experiment
(Journal article; Peer reviewed, 2018)In academia and the industry, there is an increasing interest in generating and recording low seismic frequencies, which lead to better data quality, deeper signal penetration and can be important for full-waveform inversion. ... -
Higher-order Hamilton–Jacobi perturbation theory for anisotropic heterogeneous media: transformation between Cartesian and ray-centred coordinates
(Peer reviewed; Journal article, 2021)Dynamic ray tracing is a robust and efficient method for computation of amplitude and phase attributes of the high-frequency Green’s function. A formulation of dynamic ray tracing in Cartesian coordinates was recently ... -
Structural properties of the Southern San Andreas fault zone in northern Coachella Valley from magnetotelluric imaging
(Peer reviewed; Journal article, 2022)The Southern San Andreas fault (SSAF) poses one of the largest seismic risks in California. Yet, there is much ambiguity regarding its deeper structural properties around Coachella Valley, in large part due to the relative ... -
Wavefield reconstruction for velocity–stress elastodynamic full-waveform inversion
(Peer reviewed; Journal article, 2020)Gradient computations in full-waveform inversion (FWI) require calculating zero-lag cross-correlations of two wavefields propagating in opposite temporal directions. Lossless media permit accurate and efficient reconstruction ...