Accession Number : AD0485028

Title :   RELATIVE TRAVEL-TIME ANOMALIES AT LASA AND THE LOCATION OF EPICENTERS USING SHIFT.

Descriptive Note : Scientific rept.,

Corporate Author : TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV

Personal Author(s) : Chiburis, Edward F.

Report Date : 07 JUN 1966

Pagination or Media Count : 64

Abstract : All array processes require a knowledge of significant traveltime discrepancies which may be associated with any of the array elements. Anomalies from 180 events were calculated for the 21 subarrays at the Large Aperture Seismic Array (LASA) in Montana. The anomalies are shown to be strongly dependent upon epicentral distance and direction. If the observed anomaly scatter within an epicentral region is due to epicenter location error, a computer program, SHIFT, can improve the epicenter locations from LASA by using observed P-wave arrival times and the measured average anomalies.

Descriptors :   (*SEISMOMETERS, EPICENTERS), PHASED ARRAYS, ALIGNMENT, RANGE(DISTANCE), TIME, ANOMALIES, CORRECTIONS, GEOLOGY, ERRORS, COMPUTER PROGRAMMING, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSIONS, DETECTION.

Subject Categories : Seismology
      Seismic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE