A Comparison of the Location Refinement Techniques in the SDAC/LASA event Processor

Abstract

The two location refinement techniques, beampacking and cross- correlation, which are programmed into the SDAC/LASA automated Event Processor, are shown to produce equivalent array beam traces for LASA short period data. The crosscorrelation method requires an operational signal-to-noise threshold significantly above the SDAC/LASA detection threshold of 10 db. In addition, the method yields unreliable locations for events with low coherence, such as events with low signal-to-noise ratios, mixed events, or events at short epicentral distances from the array. On the other hand the beampacking method is independent of signal-to-noise ratio. Moreover, beampacking uses 15 to 20 percent less computer time than crosscorrelation and obtains locations with smaller location errors when compared to World-wide Network locations.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Oct 09, 1973
Accession Number
AD0774457

Entities

People

  • R. O. Ahner

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Accuracy
  • Algorithms
  • Central Processing Units
  • Computers
  • Contracts
  • Cross Correlation
  • Data Analysis
  • Databases
  • Detection
  • Digital Data
  • Earth Models
  • Mediterranean Sea
  • Models
  • Security
  • Travel Time
  • Virginia
  • Waveforms

Readers

  • Computational Modeling and Simulation
  • Seismology