Accession Number:

ADA135484

Title:

Wave Propagation Study of the Central Mediterranean Sea Using Ocean Bottom Seismometers,

Descriptive Note:

Corporate Author:

TEXAS UNIV AT AUSTIN INST FOR GEOPHYSICS

Personal Author(s):

Report Date:

1983-11-01

Pagination or Media Count:

80.0

Abstract:

Ocean bottom seismometers OBS were deployed in the Mediterranean for two refraction surveys shot with underwater sound signal SUS charges. The digital data were analyzed to determine 1 the attenuation features, signalnoise SN characteristics and frequency content of water waves and body waves and 2 the crustal structure of the test areas. The attenuation of water-wave signals was fairly uniform within the passband of the OBS 10-31 HZ and was greater in deep water than in shallower water, and body waves were much more strongly attenuated than water waves. The SN ratios were much larger for the SUS shots detonated at 91 m depth than for those detonated at 244 m depth. The body-wave data indicated the presence of a layer with P-wave velocity of 3.8 kmsec about 0.8 km below mean sea level in one test area. Probably this is a Miocene evaporite sequence. Author

Subject Categories:

  • Seismology
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE