Separation of source and propagation effects at regional distances

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:98628

Goldstein, P; Jarpe, S; Mayeda, K ^[1]

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1. Lawrence Livermore National Lab., CA (United States); and others

Improved estimates of the contributions of source and propagation effects to regional seismic signals are needed to explain the performance of existing discriminants and to help develop more robust methods for identifying underground explosions. In this paper, we use close-in, local, and regional estimates of explosion source time functions to remove source effects from regional recordings of the Non-Proliferation Experiment (NPE), a one kiloton chemical explosion in N-tunnel at Rainier Mesa on the Nevada Test Site, and nearby nuclear explosions and earthquakes. Using source corrected regional waveforms, we find that regional Pg and Lg spectra of shallow explosions have significant low frequency ({approximately}1Hz) enhancements when compared to normal depth earthquakes. Data and simulations suggest that such enhancements are most sensitive to source depth, but may also be a function of mechanism, source receiver distance, and regional structure.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• OSTI ID: 98628
• Report Number(s): CONF-9404100--; ON: DE95011413
• Country of Publication: United States
• Language: English

Related Subjects

35 ARMS CONTROL
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
AMMONIUM NITRATES
AMPLITUDES
CHEMICAL EXPLOSIONS
COMPARATIVE EVALUATIONS
DETONATIONS
FUEL OILS
GROUND MOTION
NEVADA TEST SITE
NON-PROLIFERATION TREATY
NUCLEAR EXPLOSION DETECTION
NUCLEAR EXPLOSIONS
SEISMIC DETECTION
SEISMIC WAVES
SPECTRA
UNDERGROUND EXPLOSIONS
VERIFICATION
WAVE FORMS
WAVE PROPAGATION