Relative Lg and P-coda magnitude analysis of the largest Shagan River explosions. Final report, 2 April-30 October 1984

Technical Report · Fri Dec 28 00:00:00 EST 1984

OSTI ID:5560808

Baumgardt, D R

Characteristics of P-coda and Lg measurements at the NORSAR (Norwegian Seismic Array) and Graefenburg (West Germany) arrays were studied for presumed underground nuclear explosions in the Semipalatinsk region of the Soviet Union. The main objectives were to investigate the effects of the propagation paths in western Russia on the narrowband and broadband recordings of Lg at teleseismic distances and to study the relative P-coda and Lg amplitudes recorded at these two arrays for the largest (m sub b > or = 6.0) Shagan River explosions. Comparison of broadband recordings of teleseismic Lg at Graefenburg (Delta = 42 deg) with narrowband NORSAR (Delta = 38 deg) and filtered Graefenburg recordings of LG from Shagan River events reveals that Lg is more obvious, relative to the preceding P-coda, on broadband seismograms than on high-frequency seismograms. Broadband recordings of Lg at Graefenburg are about 0.5 log units stronger in the 0.2 - 1.0 Hz band than in the 0.6 - 3.0 Hz range although noise is also correspondingly higher. The early P-coda at NORSAR is stronger, relative to Lg, than that at Graefenburg. Also, the coda-envelope shapes are quite different for the two arrays.

• Research Organization: ENSCO, Inc., Springfield, VA (USA). Signal Analysis Systems Div.
• OSTI ID: 5560808
• Report Number(s): AD-A-151091/6/XAB
• Country of Publication: United States
• Language: English

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