Simulation of Regional Explosion S-Phases (SiRES) Project
Conference
·
OSTI ID:15004931
Seismic monitoring aims to locate and identify all events that generate elastic waves in the solid earth. Amplitudes and arrival-times of seismic phases are commonly exploited to accomplish these goals. For large events that produce strong body and surface waves out to 90{sup o}, events can be accurately located and the Ms/m{sub b} discriminant can be used to distinguish earthquakes from explosions. As event yield/magnitude decreases, the probability of detecting signals at distant stations diminishes, and monitoring relies heavily on regional-distance stations (between about 2{sup o} and 13{sup o}). Many regional discriminant and magnitude methods make use of S-phase amplitude measurements, which are expected to diminish for explosion sources. Despite the general success of regional monitoring methods there remain instances when explosions produce anomalously large S-phases that confound regional discriminants. The 2-year Simulation of Regional Explosion S-phases (SiRES) project explores the phenomenology of regional S-phase generation through numerical simulation. In the first year of this study we construct a 3-dimensional model of the Nevada Test Site (NTS) and the surrounding region. Extensive databases of geologic information, including existing 3-dimensional models developed under past and ongoing NTS programs, are used to construct the regional model. In addition to deterministic geologic structure and topography we introduce stochastic variability within geologic units and along boundaries. The stochastic variability provides a more realistic simulation of the regional wave field, which is known to largely consist of scattered energy. Here we introduce the project and report on the first few months of progress.
- Research Organization:
- Lawrence Livermore National Lab., CA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 15004931
- Report Number(s):
- UCRL-JC-153604
- Country of Publication:
- United States
- Language:
- English
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