The Effect of Bandpass Filters on LASA Detection Performance

Abstract

On-line testing at the SDAC of short-period automatic detection filters 0.9-1.4 Hz, 0.9-1.8 Hz, 0.8-1.8 Hz, and 0.8-2.5 Hz reveals no statistically significant differences in the number of events reaching the LASA summary bulletin. Almost all detection processor detections which do not reach the summary bulletin are due to multiple picks on regional events. Therefore, a substantial lowering of the analyst workload or a substantially lowered threshold would be possible if a reliable procedure could be developed for flagging detections due to regional events. An excellent correlation has been found between the number of events per hour which reach the summary bulletin, and the hourly noise level.

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Document Details

Document Type
Technical Report
Publication Date
Jul 31, 1975
Accession Number
ADA020315

Entities

People

  • Andre C. Chang
  • Raymond M. Seggelke

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Air Force
  • Algorithms
  • Bandpass Filters
  • Classification
  • Contractors
  • Contracts
  • Data Analysis
  • Databases
  • Detection
  • Earthquakes
  • False Alarms
  • Filters
  • Frequency
  • Security
  • Signal Processing
  • Warning Systems

Readers

  • Mathematics or Statistics
  • Seismology