Detection of Depth Phases Using Computer Graphics

Abstract

From a dataset of 116 earthquakes, all available SRO (Special Research Observatory) and PSWF (Preliminary Signal Waveform File) waveforms were presented on an interactive computer graphics screen and then examined for presence of depth phases pP, sP and PcP. Using the results, a focal depth for 66% of the total was postulated. About half of these, or 37%, agreed with depths published by NEP (Network Event Processor) or PDE (Preliminary Determination of Epicenter) bulletins. Earthquakes of magnitude m sub b > 5 are likely to produce clear depth phases. Rapid routine processing of a large number of events by the aligned-on-P method can be achieved with interactive computer graphics.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Dec 05, 1978
Accession Number
ADA091158

Entities

People

  • Brian W. Barker
  • John H. Goncz

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Computer Graphics
  • Computer Programs
  • Computers
  • Data Sets
  • Databases
  • Detection
  • Earthquakes
  • Explosions
  • Explosives Detection
  • Graphics
  • Hard Copy
  • National Security
  • Nuclear Explosions
  • Plastic Explosives
  • Security
  • Waveforms

Readers

  • Computational Modeling and Simulation
  • Human-Computer Interaction (HCI).
  • Seismology