Accession Number:

AD0760585

Title:

Long-Period Seismological Research Program

Descriptive Note:

Annual rept.

Corporate Author:

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY

Personal Author(s):

Report Date:

1973-04-25

Pagination or Media Count:

29.0

Abstract:

Approximate detection thresholds of the VLP stations for long-period surface waves were determined. Based on a special listing of events for a one month time period, 90 of the reported shallow earthquakes down to m sub b 4.2 were detected on the basis of Rayleigh or Love waves for epicentral distances as great as 30 degrees. For as many as 10 of the events that we observed, the detections were based on the observance of Love waves only. To date our results indicate that the VLP station EIL is the most effective station for discrimination between earthquakes and presumed explosions in central Asia. Signal enhancement techniques employing the VLP digital data appear to be able to lower the thresholds based on visual analysis of the seismograms by 0.2 to 0. 3 m sub b units.

Subject Categories:

  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE