NETSIM: A Computer Program for Simulating Detection and Location Capability of Regional Seismic Networks
Annual technical rept. no 1, 1 Jan 1989-1 Jan 1990
SCIENCE APPLICATIONS INTERNATIONAL CORP SAN DIEGO CA
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This report describes a computer program called NetSim that calculates simulations of detection and location capability of seismic networks that include regional stations and arrays. These simulations are used to assess seismic network capability to monitor existing and proposed nuclear explosion test limitation treaties. The main advantage of NetSim compared to similar computer programs e.g., NETWORTH and SNAPD is the incorporation of frequency dependence in the source model, noise estimates for both primarily and secondary phases, attenuation estimates, and array gain estimates. This is important for simulating the monitoring capability of regional networks, since the dominant signal frequency of regional phases often varies substantially with epicentral distance. The report provides functional descriptions of the NetSim detection and location modules and sample runs for frequency-independent and frequency-dependent input parameters. The accuracy of location uncertainties computed using two methods that attempt to account for the effect of undetected phases is also investigated. These are the probability-weighted approach used in SNAPD and a Monte Carlo approach that mimics the way location uncertainties vary in practice. Keywords Computer programs ModulesElectronics Input Output data Computer program verification Seismic data.
- Computer Programming and Software