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The Prospect of Using Three-Dimensional Earth Models to Improve Nuclear Explosion Monitoring and Ground-motion Hazard Assessment

The first 20% of the full text of this article appears below.

	INTRODUCTION

 
The past 10 years have brought rapid growth in the development and use of three-dimensional (3D) seismic models of Earth structure at crustal, regional, and global scales. In order to explore the potential for 3D seismic models to contribute to important societal applications, Lawrence Livermore National Laboratory (LLNL) hosted a Workshop on Multi-Resolution 3D Earth Models to Predict Key Observables in Seismic Monitoring and Related Fields on 6–7 June 2007, in Berkeley, California. The workshop brought together academic, government, and industry leaders in research programs developing 3D seismic models and methods for nuclear explosion monitoring and seismic ground-motion hazard assessment. The workshop was designed to assess the current state of 3D seismology and to discuss a path forward for 3D Earth models and techniques— how can they be used to achieve measurable increases in our capabilities for monitoring underground nuclear explosions and characterizing seismic ground-motion hazards? This paper highlights some of the presentations, issues, and discussions at the workshop and proposes two specific paths by which to begin quantifying the potential contribution of progressively refined 3D seismic models in critical applied arenas.

Seismic monitoring agencies are tasked with detection, location, and characterization of seismic activity in near real time. In the case of nuclear explosion monitoring or seismic hazard, decisions to further investigate a suspect event or to launch disaster relief efforts may rely heavily on real-time analysis and results. Because these are weighty decisions, monitoring agencies are regularly called upon to meticulously document and justify every aspect of their monitoring system. To meet this level of scrutiny and maintain operational robustness, only mature technologies are considered for operational monitoring systems, so operational technology necessarily lags contemporary research.

Current monitoring practice is to use relatively simple Earth models that generally afford analytical prediction of seismic observables (see "Examples of Current . . . [Full Text of this Article]

Lawrence Livermore National Laboratory
7000 East Avenue
Livermore, California 94550 U.S.A.
(W.R.W., A.J.R., M.E.P, S.C.M., D.H. and T.A.)
zucca2@llnl.gov
(J.J.Z.)
Lamont-Doherty Earth Observatory of Columbia University
Route 9W
Palisades, New York 10964 U.S.A.
(P.R.)
University of California, Santa Cruz
Department of Earth and Planetary Sciences
Santa Cruz, California 95064 U.S.A.
(T.L.)