On the validation of seismic imaging methods: Finite frequency or ray theory?
We investigate the merits of the more recently developed finite-frequency approach to tomography against the more traditional and approximate ray theoretical approach for state of the art seismic models developed for western North America. To this end, we employ the spectral element method to assess the agreement between observations on real data and measurements made on synthetic seismograms predicted by the models under consideration. We check for phase delay agreement as well as waveform cross-correlation values. Based on statistical analyses on S wave phase delay measurements, finite frequency shows an improvement over ray theory. Random sampling using cross-correlation values identifies regions where synthetic seismograms computed with ray theory and finite-frequency models differ the most. Our study suggests that finite-frequency approaches to seismic imaging exhibit measurable improvement for pronounced low-velocity anomalies such as mantle plumes.
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Earth and Environmental Sciences Division.
- University of Southern California, Los Angeles, CA (United States). Department of Earth Sciences; Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science.
- Univ. of California, Berkeley, CA (United States). Dept. of Earth and Planetary Science.
- Publication Date:
- Grant/Contract Number:
- AC52-06NA25396; AC52-06NA25396/LA12-SignalPropagation-NDD2Ab; 116467
- Published Article
- Journal Name:
- Geophysical Research Letters
- Additional Journal Information:
- Journal Volume: 42; Journal Issue: 2; Journal ID: ISSN 0094-8276
- American Geophysical Union
- Research Org:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org:
- Country of Publication:
- United States
- 58 GEOSCIENCES
- OSTI Identifier:
- Alternate Identifier(s):
- OSTI ID: 1212465; OSTI ID: 1240468