Full-wave Moment Tensor and Tomographic Inversions Based on 3D Strain Green Tensor

Abstract

We developed a unified source moment tensor and tomographic inverse method based on finite difference simulations of wave propagation at local to teleseismic distances. The new method accounts for complex wave propagation in three-dimensional (3D) earth, linearizes the inverse problem by iteratively updating the earth model, and provides an accurate way to integrate body- and surface-wave observations. The finite-difference methods developed to date make it possible to construct hierarchical FD-SGT databases efficiently and with great flexibility. The spherical finite-difference method is well suited for regional and global wave propagation, while the finite-difference method with boundary conforming grids that follow topography provides higher accuracy at local and near regional scales. The self-consistent FD-SGT databases constructed from finite-difference simulations of wave propagation in full-wave tomographic models can be used to determine the moment tensors within minutes after a seismic event, making it possible for real time monitoring using 3D models.

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Document Details

Document Type
Technical Report
Publication Date
Jan 31, 2010
Accession Number
ADA517109

Entities

People

  • Xiaoping Yang
  • Yang Shen

Organizations

  • Leidos

Tags

Communities of Interest

  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Computational Science
  • Databases
  • Differential Equations
  • Earth Models
  • Elastic Properties
  • Elastic Waves
  • Frequency Bands
  • Fresnel Zones
  • Geometry
  • Grids
  • Inverse Problems
  • Surface Waves
  • Three Dimensional
  • Wave Propagation
  • Waveforms

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Seismology
  • Wave Propagation and Nonlinear Chaotic Dynamics.