Teleseismic Waveform Modeling Incorporating the Effects of Known Three-Dimensional Structure Beneath the Nevada Test Site.
Abstract
Seismograms were synthesized by the Gaussian beam method and ray trajectories were plotted for a plane wave incident on a 3-D structure obtained from block inversion of teleseismic travel times observed at a local array in central California. The amplitude variations for the given profile are smaller than the order of magnitude variations typically observed. Since amplitudes are sensitive to smaller scale velocity features than travel times, this may indicate that a single scale block model may have difficulty in satisfying both travel time and amplitude. The synthesis of teleseismic body waves by either the Gaussian beam, Maslov, or Kirchhoff techniques entails the integration of dynamic and kinematic ray tracing equations over parts of the model having 3-D as well as 1-D velocity variations. The longest integration intervals are over the 1-D or radially symmetric part of the model. A procedure consisting of the multiplication of propagator matrices can be used to smoothly patch analytic solutions of the dynamic equations obtained over the 1-D or radially symmetric part of the model into numerical solutions obtained over the parts of the model having 3-D velocity variations. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 22, 1985
- Accession Number
- ADA166443
Entities
People
- Vernon F. Cormier
Organizations
- Massachusetts Institute of Technology