Recording of ocean-bottom seismic noise and of a strong earthquake in the Himalayas by broadband digital OBS installed on the Mid-Atlantic Ridge

Details Recording of ocean-bottom seismic noise and of a strong earthquake in the Himalayas by broadband digital OBS installed on the Mid-Atlantic Ridge Recording of ocean-bottom seismic noise and of a strong earthquake in the Himalayas by broadband digital OBS installed on the Mid-Atlantic Ridge

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pepi...84..305l&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 84, Issue 1-4, p. 305-320.

Physics

2

Scientific paper

A broadband digital-analog ocean-bottom seismograph (OBS) with frequency pass band 0.003-30 Hz was installed in October 1991 on the Mid-Atlantic Ridge in the area of the Azores, where it operated for 3 days in programmed mode. The general structure of long-period ocean bottom seismic noise previously observed in several sea-floor experiments was confirmed, i.e. storm microseisms lie in the range 0.15-0.30 Hz and minimum noise is observed in the range 0.04-0.12 Hz (the band most appropriate for registering remote earthquakes). For still lower frequencies the level of noise increases. The level of background ocean-bottom seismic oscillations is time dependent. Strong `storms' of microseisms were observed. In addition, a strong (M = 7.2) earthquake occurred in the Himalayas on 19 October 1991 and was recorded in its entirety during one of the 2 h operational periods. The dispersive Love wave train was the most interesting one on the record, and dispersion curves of group velocity for two harmonics of the wave were derived. The dispersion curves are characteristic of a medium which is intermediate between transitional (from continental to oceanic) and continental models.

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