1969 Aleutian Islands Experiment. Project MILROW
TEXAS INSTRUMENTS INC DALLAS SERVICES GROUP
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The VELA Seismological Center, upon request from the Advanced Research Projects Agency of the Department of Defense, participated in Project MILROW, an underground nuclear explosion triggered 2 October 1969 at 2206Z on Amchitka Island in the Aleutian Chain. Texas Instruments was selected to install, operate, and analyze data from a network of Ocean-Bottom Seismograph units deployed in waters surrounding Amchitka Island for a 3-week period. The objectives of this program were to observe aftershock activity and to improve epicenter locations of such seismic activity within a 50-km radius of the MILROW site. The major tasks involved in completing the experiment included equipment preparation, field operations, and data analysis. This report describes the experiments, analytical goals, and the results obtained. Evaluation of the OBS equipment and recommendations for improving equipment reliability are also included. A crustal model was developed to permit hypocenter calculations for events in the vicinity of Amchitka Island 250 associated events which correlated with USC and GS data were found. Hypocenter-location refinement was attempted on 140 of these events 81 events yielded satisfactory hypocenter location, and 27 of the events occurred in the vicinity of ground zero.
- Seismic Detection and Detectors