Accession Number:

ADA172543

Title:

Hydrophone Investigations of Earthquake and Explosion Generated High-Frequency Seismic Phases.

Descriptive Note:

Final rept. Oct 83-Sep 85,

Corporate Author:

HAWAII INST OF GEOPHYSICS HONOLULU

Personal Author(s):

Report Date:

1986-04-30

Pagination or Media Count:

320.0

Abstract:

Data from the Wake Island Hydrophone Array has been 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 deg to 90 deg 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. Keywords Body waves, Spectral analysis, Hydrophone recordings Nuclear explosion detection, Marine seismology, Guided phases.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE