Imaging of seismic discontinuities using an adjoint method
Geophysical Journal International
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Abstract
For imaging of seismic discontinuities at depth, reverse time migration (RTM) is a powerful method to apply to recordings of seismic events. It is especially powerful when an extensive receiver array, numerous seismic sources, or both, permit adequate reconstruction of incident and scattered wavefields at depth. Reconstructing either the incident or scattered wavefield at depth becomes less accurate when relatively few recordings of seismic events are available. Here we explore an inverse scattering approach to imaging discontinuities based on an adjoint method, employing sensitivity kernels (Frechet derivatives) that represent jumps in material properties across seismic-discontinuity surfaces. When combined with ray-based requirements on scattering geometry, it constitutes a powerful approach to determining the locations and amplitudes of the discontinuities, recovering only those properties that can be resolved by a spatially limited source and/or receiver distribution. This is illustrated by synthetic examples with local sources followed by a field example in a subduction zone setting
Suggested Citation
Pollitz, F., and Langer, L., 2024, Imaging of seismic discontinuities using an adjoint method: Geophysical Journal International, v. 240, no. 1, p. 96-116, https://doi.org/10.1093/gji/ggae377.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Imaging of seismic discontinuities using an adjoint method |
| Series title | Geophysical Journal International |
| DOI | 10.1093/gji/ggae377 |
| Volume | 240 |
| Issue | 1 |
| Publication Date | October 26, 2024 |
| Year Published | 2024 |
| Language | English |
| Publisher | Oxford Academic |
| Contributing office(s) | Earthquake Science Center |
| Description | 21 p. |
| First page | 96 |
| Last page | 116 |
| Country | United States |
| State | Washington |
| Other Geospatial | Olympic Peninsula |