Hydrophone investigations of earthquake and explosion generated high-frequency seismic phases. Final report, October 1983-September 1985

Technical Report · Wed Apr 30 00:00:00 EDT 1986

OSTI ID:6907853

Walker, D A

Data from the Wake Island Hydrophone Array was used in studies related to the detection and discrimination of underground nuclear explosions. These include: (1) comparative studies of explosion phases from sites at comparable epicentral distances in the highly efficient propagational distance range of 60 to 90/sup 0/; (2) some preliminary estimates of detection level thresholds; (3) estimates of deep ocean noise levels and comparisons to quiet continental sites; (4) determinations of the stability of yield estimates; and (5) the location of significant earthquakes unreported by both the NEIS and ISC, but well-recorded at great distances by elements of the Wake array, in the interior and along the subducting margins of the Western Pacific Basin. The unreported earthquakes in the southwest Pacific have led, in part, to the discovery of a new subduction zone - the Micronesian Trench. Unreported earthquakes in the interior of the basin and along its subducting margins may also have associated gravitational effects of Air Force relevance. Finally, data from the Wake array has been useful in a partial resolution of the reported mystery cloud of 9 April 1984 and in the analysis of T-phases from underground explosions in the Tuamotus.

• Research Organization: Hawaii Univ., Honolulu (USA). Hawaii Inst. of Geophysics
• OSTI ID: 6907853
• Report Number(s): AD-A-172543/1/XAB
• Resource Relation: Other Information: Original contains color plates: All DTIC and NTIS reproductions will be in black and white
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
NUCLEAR EXPLOSION DETECTION
SEISMIC ARRAYS
UNDERGROUND EXPLOSIONS
EARTH MANTLE
EARTHQUAKES
EPICENTERS
GRAVITATIONAL FIELDS
MICRONESIA
OCEANIC CRUST
PACIFIC OCEAN
SUBDUCTION ZONES
DETECTION
EARTH CRUST
EXPLOSIONS
ISLANDS
MEASURING INSTRUMENTS
OCEANIA
SEAS
SEISMIC EVENTS
SURFACE WATERS
450300* - Military Technology
Weaponry
& National Defense- Nuclear Explosion Detection