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Title: Validation of Western North America Models based on finite-frequency and ray theory imaging methods

Abstract

We validate seismic models developed for western North America with a focus on effect of imaging methods on data fit. We use the DNA09 models for which our collaborators provide models built with both the body-­wave FF approach and the RT approach, when the data selection, processing and reference models are the same.

Authors:
 [1];  [1];  [2];  [1];  [1];  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Southern California, Los Angeles, CA (United States)
  3. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1169158
Report Number(s):
LA-UR-15-20681
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Planetary Sciences; Spectral Element Method; statistical inferences; Finite-; Ray Theory

Citation Formats

Larmat, Carene, Maceira, Monica, Porritt, Robert W., Higdon, David Mitchell, Rowe, Charlotte Anne, and Allen, Richard M.. Validation of Western North America Models based on finite-frequency and ray theory imaging methods. United States: N. p., 2015. Web. doi:10.2172/1169158.
Larmat, Carene, Maceira, Monica, Porritt, Robert W., Higdon, David Mitchell, Rowe, Charlotte Anne, & Allen, Richard M.. Validation of Western North America Models based on finite-frequency and ray theory imaging methods. United States. doi:10.2172/1169158.
Larmat, Carene, Maceira, Monica, Porritt, Robert W., Higdon, David Mitchell, Rowe, Charlotte Anne, and Allen, Richard M.. Mon . "Validation of Western North America Models based on finite-frequency and ray theory imaging methods". United States. doi:10.2172/1169158. https://www.osti.gov/servlets/purl/1169158.
@article{osti_1169158,
title = {Validation of Western North America Models based on finite-frequency and ray theory imaging methods},
author = {Larmat, Carene and Maceira, Monica and Porritt, Robert W. and Higdon, David Mitchell and Rowe, Charlotte Anne and Allen, Richard M.},
abstractNote = {We validate seismic models developed for western North America with a focus on effect of imaging methods on data fit. We use the DNA09 models for which our collaborators provide models built with both the body-­wave FF approach and the RT approach, when the data selection, processing and reference models are the same.},
doi = {10.2172/1169158},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Feb 02 00:00:00 EST 2015},
month = {Mon Feb 02 00:00:00 EST 2015}
}

Technical Report:

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  • 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 identifiesmore » 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.« less
  • 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 identifiesmore » 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.« less
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