Model P Wave Multipathing at Regional Distances in Southeast Asia

Abstract

This report describes our analysis of seismograms recorded by the medium aperture array in Chiang Mai, Thailand (CMAR). There are two main topics covered in the report. One relates to array analysis of noise recorded over a ten year period. We document the directional characteristics of the noise as well as the seasonal variation in its amplitude. Most of this work is described in the appendix. The second topic involves array analysis of regional distance P coda waves from seismic events occurring in South Asia. Using a sliding window technique we identify coherent later arriving phases associated with the 410 km discontinuity and speculate on how their properties relate to Earth structure in the region. We also describe how the amount of near-source scattering affects coda wave amplitudes at various distances.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Jun 09, 2008
Accession Number
ADA493820

Entities

People

  • Ali Fatehi
  • Keith D. Koper

Organizations

  • Saint Louis University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Algorithms
  • Ambient Noise
  • Amplitude
  • Asia
  • Data Sets
  • Discontinuities
  • Eurasia
  • Frequency Bands
  • Geography
  • Nuclear Explosions
  • Scattering
  • South Asia
  • Southeast Asia
  • Thailand
  • Wave Propagation

Readers

  • Library and Information Science/ Studies, Southeast Asia Studies, Bibliography of Vietnam and Lao Studies.
  • Seismology
  • Theoretical Analysis.