Accession Number:

AD0774027

Title:

Compressional Wave Power Spectrum from Seismic Sources

Descriptive Note:

Rept. for 30 Jun 1972-29 Jun 1973

Corporate Author:

HELSINKI UNIV (FINLAND) INST OF SEISMOLOGY

Personal Author(s):

• Noponen, Ilkka

Report Date:

1973-10-31

Pagination or Media Count:

79.0

Abstract:

The power spectra of P wave signals are studied. Data from the 22 long period LP and short period SP sensors of the NORSAR array in Norway is used. For each type of sensor, the signals from all sensors are combined in an optimum way to produce average LP and SP spectra. Bias due to noise power is removed, the instrument responses are corrected for and the LP and SP spectra merged together. About 150 events are treated, of these the LP signals are analyzed for about 20 events. The earthquake and explosion spectra agree well with the predictions of analytical source models.

Descriptors:

• *SEISMIC DETECTION
• FINLAND
• LOW FREQUENCY
• NORWAY
• POWER SPECTRA
• SEISMIC WAVES

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE