SBIR/STTR Research Award

SITE CHARACTERIZATION BY PASSIVE MONITORING OF HIGH FREQUENCY MICROSEISMS

Award identifier 70a2ea2ebe3478d999fb58048e6a6f0555cc4fd703396c3f9b2df5e7608373f0Awarding agency Department of Defense · Air Force

Award amount

$49,630

Program and phase

SBIR · Phase I

Award year

1989

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Award details

Awarding agency
Department of Defense
Branch
Air Force
Recipient company
Risk Engineering Inc.
Proposal award date
Not reported
Contract end date
Not reported
UEI
Not reported
Solicitation number
Not reported
Topic code
Not reported

Research abstract

THIS WORK WILL EXAMINE THE FEASIBILITY OF RECORDING MICROEARTHQUAKES AND MICROTREMOR NOISE AT HIGH FREQUENCIES (UP TO 50 HZ), ANALYZING THE FOURIER AND RESPONSE SPECTRUM CHARACTER AT HIGH FREQUENCIES TO DETERMINE NEAR SURFACE ROCK ATTENUATION, AND RELATING THIS TO ENGINEERING ROCK PROPERTIES. TWO SITES WILL BE INSTRUMENTED IN CALIFORNIA (A HARDAND SOFT-ROCK SITE) WHERE AVAILABLE WELL DATA INDICATE ROCK PROPERTIES TO DEPTHS OF 0.6 AND 1.8 KM, RESPECTIVELY. MICROSEISMS WILL BE RECORDED AT THESE TWO SITES AND WILL BE ANALYZED TO EVALUATE HIGH FREQUENCY CHARACTERISTICS AND TO CALCULATE INTRINSIC ATTENUATION. THE INFERRED ENGINEERING PROPERTIES OF THE ROCK WILL BE COMPARED TO BOREHOLE DATA TO EVALUATE THE FEASIBILITY OF THE METHOD AS A SCREENING TOOL FOR SITE CHARACTERIZATION.

Technology keywords

Not reported

Agency intelligence

Department of Defense

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