Seismic transmission imaging
- Lawrence Livermore National Lab., CA (United States)
- Geological Survey, Menlo Park, CA (United States)
- California Univ., Santa Cruz, CA (United States). Inst. of Tectonics
The goals of this project are to develop enhanced resolution seismic transmission imaging (or reconstruction) methods and apply them to the study of complex structures and geological processes in the Earth`s lithosphere. Our immediate objectives are to improve existing traveltime tomography algorithms by including new traveltime calculation codes and feasibility constraints, test new reconstruction techniques (including nonlinear optimization) with synthetic and existing data sets, and conduct preliminary field experiments to test new algorithms and approaches. Enhanced images are not the only objectives; we also emphasize interpretation of the images to improve our understanding of geological processes in the continental lithosphere. The emphasis in this project is on seismic transmission imaging (STI) as opposed to seismic reflection imaging. STI uses direct (or diving) waves to ``illuminate`` a target volume. Occasionally wide-angle reflections are utilized for STI, but only in the sense that the reflecting horizon is used to ``backlight`` the target zone and is not imaged directly. Our purpose is to investigate enhancements to imaging methods to achieve higher resolution and apply them to regions of complex crustal structure such as magmatic and volcanic areas where the reflection technique often works poorly. In this presentation, we concentrate on describing our efforts in improving traveltime tomography and our initial work on utilizing the full waveform for seismic imaging. 17 refs.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10148215
- Report Number(s):
- UCRL-JC-106760; CONF-9104199-2; ON: DE92014714
- Resource Relation:
- Conference: Review of underground imaging by USDOE OBES/Geosciences conference,Berkeley, CA (United States),16-17 Apr 1991; Other Information: PBD: Mar 1991
- Country of Publication:
- United States
- Language:
- English
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