Improved Regional Seismic Event Locations Using 3-D Velocity Models

Abstract

The objective of this research is to develop improved methods for regional and local seismic event locations from 3-D velocity models. Improved hypocenter estimates and high resolution velocity models are critical to the successful seismic monitoring of potential nuclear tests. During Phase 1 of the study we have developed a nonlinear, multiple event location technique which uses primary and secondary phases (for P waves) and a 3-D regional velocity model to estimate event hypocenters. Travel times for the regional phases are calculated using a sophisticated eikonal finite difference scheme, and the locations are determined using an efficient grid search algorithm for 3-D media. We demonstrate its capabilities using synthetic data and a 3-D velocity model from a region of U.S. monitoring concern.

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Document Details

Document Type
Technical Report
Publication Date
Dec 15, 1999
Accession Number
ADA372451

Entities

People

  • Delaine Reiter
  • Michelle Bernard
  • Shirley Rieven
  • William Rodi

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Accuracy
  • Algorithms
  • Cartesian Coordinates
  • Computations
  • Contracts
  • Coordinate Systems
  • Earth Models
  • Earthquakes
  • Geometry
  • Grids
  • Longitude
  • Models
  • Monitoring
  • Stations
  • Three Dimensional
  • Travel Time
  • Two Dimensional

Readers

  • Computational Modeling and Simulation
  • Seismology