Tidal modulation of seismic noise and volcanic tremor

Details Tidal modulation of seismic noise and volcanic tremor Tidal modulation of seismic noise and volcanic tremor

Aug 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30sde10c&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 15, pp. SDE 10-1, CiteID 1816, DOI 10.1029/2003GL016991

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3

Geodesy And Gravity: Tides-Earth, Seismology: Volcano Seismology (8419), Volcanology: Eruption Monitoring (7280), Volcanology: Hydrothermal Systems (8135)

Scientific paper

We present seismic data from Fogo Volcano (Cape Verde Republic) that document a tidal control on the amplitude of seismic noise and volcanic tremor. The effect is detectable in the raw data by simple eye inspection. We identified the main periodicity in the noise modulation, which coincides with the tidal component M2. The signal duration of 40 days, together with a sampling rate of 1440 samples per day (seismic r.m.s. time series) allowed the resolution of M2 from the neighbor solar frequencies that are often related to environmental effects. Spectral analysis shows that the modulation affects selectively the frequency range 2.0 Hz-3.0 Hz, which we interpret as volcanic tremor. White noise from 1.5 Hz to 7 Hz is also modulated. Comparison with meteorological data reinforces the conclusion that the effect is not due to environmental parameters.

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