Accession Number:

AD0735765

Title:

Long-Period Seismological Research Program.

Descriptive Note:

Semi-annual rept.,

Corporate Author:

LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES N Y

Personal Author(s):

• Sykes,Lynn R.
• Savino,John M.

Report Date:

1971-10-25

Pagination or Media Count:

18.0

Abstract:

The most significant finding of the data analysis pertinent to the earthquake-explosion discrimination problem is one based on results from the seismic detection and earth noise studies. Visual examination of high-gain seismograms from CTA, FBK, and the station at Ogdensburg, NJ OGD, for approximately 1,000 events in the magnitude range from m sub b 3.3 to about 6.5 indicates that surface waves with periods as long as 30 to 40 seconds are observable after most events, in particular the smallest magnitude events studied e.g. m sub b 3.6 recorded at FBK at epicentral distances of 5 to 10 degrees. Author

Descriptors:

• NOISE
• DETECTION
• POWER SPECTRA
• EARTHQUAKES
• EPICENTERS
• SITE SELECTION
• MICROSEISMS
• SAMPLING
• ANALOG SYSTEMS
• DIGITAL SYSTEMS
• DATA PROCESSING EQUIPMENT

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE