Accession Number:

ADA247720

Title:

Site Description, Operational History, and Broadband Noise Characteristics of IRIS/IDA Stations AAK (Ala-Archa, Kirghizia) and TLY (Talaya, Lake Baikal Region, Russia)

Descriptive Note:

Semiannual technical rept. 1 Jul-31 Dec 1991,

Corporate Author:

SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA INST OF GEOPHYSICS AND PLANETARY PHYSICS

Personal Author(s):

Report Date:

1992-01-15

Pagination or Media Count:

21.0

Abstract:

Averaged ambient ground noise power spectra are calculated for two broadband IRISIDA seismic stations deployed at Talaya TLY near Lake Baikal in Russia and Ala-Archa AAK near Bishkek in Kirghizia, central Asia. Site descriptions are provided for these stations, as well as major episodes up to mid-1991 in their operational history that are relevant to potential data users. Findings can be summarized as follows AAK shows among the lowest average absolute nighttime noise levels above 1 Hz documented to date for IRISIDA stations in the former USSR its night-averaged noise levels above 1 Hz are very similar to those observed at GAR. Ground noise increases during the day at AAK, with the maximum increase 7-9 dB occurring between 2-3 Hz. Below .7 Hz, day and night noise at AAK is the same. TLY average nighttime noise level are about 6-10 dB higher than AAK levels above 1 Hz its night-average noise above 1 Hz is very similar to that observed at IRISIDA station KIV. Below .6 Hz, nighttime levels at AAK and TLY are comparable, except that TLY has lower horizontal noise levels 4-5 dB at periods longer than 25 s. Almost no difference between night and day noise was observed at TLY in this sense it is unique among IRISIDA stations in the USSR.

Descriptors:

Subject Categories:

  • Nuclear Warfare
  • Nuclear Weapons
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE


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