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Title: Geophysical Model Applications for Monitoring

Abstract

Geophysical models constitute an important component of calibration for nuclear explosion monitoring. We will focus on four major topics and their applications: (1) surface wave models, (2) receiver function profiles, (3) regional tomography models, and (4) stochastic geophysical models. First, we continue to improve upon our surface wave model by adding more paths. This has allowed us to expand the region to all of Eurasia and into Africa, increase the resolution of our model, and extend results to even shorter periods (7 sec). High-resolution models exist for the Middle East and the YSKP region. The surface wave results can be inverted either alone, or in conjunction with other data, to derive models of the crust and upper mantle structure. One application of the group velocities is to construct phase-matched filters in combination with regional surface-wave magnitude formulas to improve the mb:Ms discriminant and extend it to smaller magnitude events. Next, we are using receiver functions, in joint inversions with the surface waves, to produce profiles directly under seismic stations throughout the region. In the past year, we have been focusing on deployments throughout the Middle East, including the Arabian Peninsula and Turkey. By assembling the results from many stations, wemore » can see how regional seismic phases are affected by complicated upper mantle structure, including lithospheric thickness and anisotropy. The next geophysical model item, regional tomography models, can be used to predict regional travel times such as Pn and Sn. The times derived by the models can be used as a background model for empirical measurements or, where these don't exist, simply used as is. Finally, we have been exploring methodologies such as Markov Chain Monte Carlo (MCMC) to generate data-driven stochastic models. We have applied this technique to the YSKP region using surface wave dispersion data, body wave travel time data, receiver functions, and gravity data. The models can be used to predict a number of geophysical measurements, including waveforms that can be generating using techniques such as finite difference and spectral element modeling.« less

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
877902
Report Number(s):
UCRL-PROC-213667
TRN: US200608%%635
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: 27th Seismic Research Review, Palm Springs, CA, United States, Sep 20 - Sep 22, 2005
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; 58 GEOSCIENCES; AFRICA; ANISOTROPY; CALIBRATION; CHAINS; FOCUSING; MIDDLE EAST; MONITORING; NUCLEAR EXPLOSIONS; RESOLUTION; SIMULATION; THICKNESS; TOMOGRAPHY; TURKEY; WAVE FORMS

Citation Formats

Pasyanos, M, Walter, W, Tkalcic, H, Franz, G, Gok, R, and Rodgers, A. Geophysical Model Applications for Monitoring. United States: N. p., 2005. Web.
Pasyanos, M, Walter, W, Tkalcic, H, Franz, G, Gok, R, & Rodgers, A. Geophysical Model Applications for Monitoring. United States.
Pasyanos, M, Walter, W, Tkalcic, H, Franz, G, Gok, R, and Rodgers, A. 2005. "Geophysical Model Applications for Monitoring". United States. https://www.osti.gov/servlets/purl/877902.
@article{osti_877902,
title = {Geophysical Model Applications for Monitoring},
author = {Pasyanos, M and Walter, W and Tkalcic, H and Franz, G and Gok, R and Rodgers, A},
abstractNote = {Geophysical models constitute an important component of calibration for nuclear explosion monitoring. We will focus on four major topics and their applications: (1) surface wave models, (2) receiver function profiles, (3) regional tomography models, and (4) stochastic geophysical models. First, we continue to improve upon our surface wave model by adding more paths. This has allowed us to expand the region to all of Eurasia and into Africa, increase the resolution of our model, and extend results to even shorter periods (7 sec). High-resolution models exist for the Middle East and the YSKP region. The surface wave results can be inverted either alone, or in conjunction with other data, to derive models of the crust and upper mantle structure. One application of the group velocities is to construct phase-matched filters in combination with regional surface-wave magnitude formulas to improve the mb:Ms discriminant and extend it to smaller magnitude events. Next, we are using receiver functions, in joint inversions with the surface waves, to produce profiles directly under seismic stations throughout the region. In the past year, we have been focusing on deployments throughout the Middle East, including the Arabian Peninsula and Turkey. By assembling the results from many stations, we can see how regional seismic phases are affected by complicated upper mantle structure, including lithospheric thickness and anisotropy. The next geophysical model item, regional tomography models, can be used to predict regional travel times such as Pn and Sn. The times derived by the models can be used as a background model for empirical measurements or, where these don't exist, simply used as is. Finally, we have been exploring methodologies such as Markov Chain Monte Carlo (MCMC) to generate data-driven stochastic models. We have applied this technique to the YSKP region using surface wave dispersion data, body wave travel time data, receiver functions, and gravity data. The models can be used to predict a number of geophysical measurements, including waveforms that can be generating using techniques such as finite difference and spectral element modeling.},
doi = {},
url = {https://www.osti.gov/biblio/877902}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2005},
month = {7}
}

Conference:
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