On the spectra shape of seismic noise and earthquakes recorded in the ocean

Details On the spectra shape of seismic noise and earthquakes recorded in the ocean On the spectra shape of seismic noise and earthquakes recorded in the ocean

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pepi...63..234o&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 63, Issue 3-4, p. 234-242.

Physics

1

Scientific paper

The shape of the spectra of ocean bottom noise and earthquakes recorded in the course of seismological observations in the ocean is analysed.
The generalized spectra of bottom seismic noise are suggested as reference curves for comparison with new data. The comparison showed a similarity in the shape and level of the generalized spectra to the noise spectra obtained recently both on the bottom and under the bottom by seismographs placed in holes drilled by the Deep-sea Drilling Project.
The spectral analysis of the earthquakes recorded on the bottom of the North-west Pacific basin has shown clear maxima at frequencies of 7-17 Hz formed both by site effects and by absorption of seismic energy in the lithosphere. The frequency of spectral maxima decrease with increasing epicentral distance. Comparison of the earthquake spectra with generalized spectra of bottom noise revealed (probably) incidental coincidence in the frequencies of the minimum for noise spectra (10 Hz) and the average maximum of earthquake record spectra.
The sharp mechanical impacts on a bottom seismograph, usually induced by bottom displacements under the instrument, are suggested as rough analogues of the impulses for the bottom instrument system transient calibration. Test measurements have shown that in many cases this method makes it possible to distinguish spectral peaks characterising earthquakes and seismic noise wave trains from those which are caused by coupling resonances of the OBS-sediment interface.

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