Evidence for Long-period (14-30 Days) and Against Short-period (12-24 Hours) Tidal Modulation of Volcanic Tremor at Arenal Volcano, Costa Rica

Details Evidence for Long-period (14-30 Days) and Against Short-period (12-24 Hours) Tidal Modulation of Volcanic Tremor at Arenal Volcano, Costa Rica Evidence for Long-period (14-30 Days) and Against Short-period (12-24 Hours) Tidal Modulation of Volcanic Tremor at Arenal Volcano, Costa Rica

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.s41c1849h&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #S41C-1849

Other

7280 Volcano Seismology (8419), 8408 Volcano/Climate Interactions (1605, 3309), 8419 Volcano Monitoring (7280), 8428 Explosive Volcanism

Scientific paper

Many studies have sought a correlation between the occurrence of earthquakes or volcanic activity and various Earth tide components, which would provide evidence for external tidal modulation of these geophysical phenomena. Several studies of short duration seismic experiments at Arenal Volcano in Costa Rica have found evidence of diurnal and semi-diurnal tidal periodicities in the seismic record. However, studies at other volcanoes, using longer time series, with improved spectral resolution, do not find tidal peaks in the seismic spectrum, but rather solar peaks (at exactly 12 and/or 24 hours), suggesting that the modulation is caused not by tidal stresses, but by weather related parameters - temperature, barometric pressure, rainfall. In contrast, recent studies of nonvolcanic tremor in the subduction zones of Japan and Cascadia do find evidence for tidal modulation of tremor activity with a period of 12.4 hours. Thus, the questions of whether or not earthquakes and volcanoes are triggered by external forces, and if so, whether these forces are related to elastic tides or to weather, are still highly relevant. We examine a continuous, 302-day long recording of ground motion at Arenal Volcano, Costa Rica, for potential solar and lunar periodicities in the volcanic seismicity. No evidence is found for significant energy in the semidiurnal (near 12 hr) or diurnal (near 24 hr) frequency bands, in contrast to previous, lower- resolution studies at Arenal. However, analysis with multi-taper method (MTM) and singular spectrum analysis (SSA) reveals significant low-frequency (f < .005 cycles/hr) energy in the tremor and explosivity series, including 14 and 30-day quasi-periodic components, relative to a red noise hypothesis. We attempt to fit the data to long-period tidal frequencies in order to verify potential tidal modulation of the long-period seismic energy at Arenal.

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