Analysis of Digitized Seismograms from Russian Geophysical Survey Stations of Soviet Peaceful Nuclear Explosions
Throughout the 1970s and 1980s, the permanent seismic stations of the Soviet Union recorded over 100 peaceful nuclear explosions (PNEs) detonated within the Soviet Union. These records represent a large data set that has not been fully utilized. Digitization and analysis of the historic seismograms...
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| Format: | Text |
| Language: | English |
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2009
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| Online Access: | http://www.dtic.mil/docs/citations/ADA505345 http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA505345 |
| Summary: | Throughout the 1970s and 1980s, the permanent seismic stations of the Soviet Union recorded over 100 peaceful nuclear explosions (PNEs) detonated within the Soviet Union. These records represent a large data set that has not been fully utilized. Digitization and analysis of the historic seismograms has allowed the extension of long-range PNE profile data into geographic regions not previously covered. Although the resolution of the profiles is limited by the distribution of permanent seismic stations operating at the time, the first long range profiles have been constructed through the Magadan and Chukotka regions. The Magadan region profile indicates velocities slower than those found from Kimberlite-4, the closest of the old PNE profiles. Western portions of the Magadan profile associated with the Siberian Platform and western Verkhoyansk Fold Belt are elevated relative to iasp91. Beyond the platform in the tectonically active areas, velocities are reduced and closer to iasp91. The Chukotka profile shows elevated velocities relative to iasp91, which decreases at station Zyryanka on the Kolyma-Omolon Superterrane. The delayed P arrival may be an effect of the large Indigirka-Zyryanka Basin in the vicinity of the station. Continuing east through Chukotka, velocities are much closer to iasp91. The digitized historic seismograms will be useful for explosion discrimination and other studies if the data are reliable and of sufficient quality. A direct comparison relating digitized short-period photopaper records to modern digital data was conducted to establish the range of useful frequency content and quality of data. For this study, digitized short period (Russian SKM seismometer) photopaper seismograms recorded at Yuzhno Sakhalinsk from September 2008 were compared to seismograms from the IRIS GSN station at Yuzhno Sakhalinsk (YSS). Seismograms show nearly identical waveforms and amplitude content in the 1-5 Hz range for all three components. Presented at 2009 Monitoring Research Review - Ground-Based Nuclear Explosion Monitoring Technologies held in Tucson, AZ on 21-23 Sep 2009. Published in the Proceedings of 2009 Monitoring Research Review - Ground-Based Nuclear Explosion Monitoring Technologies, v1 p121-130, 2009. The original document contains color images. All DTIC reproductions will be in black and white. |
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