Ocean noise triggering of rhythmic long period events at Deception Island volcano

Details Ocean noise triggering of rhythmic long period events at Deception Island volcano Ocean noise triggering of rhythmic long period events at Deception Island volcano

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3822307s&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 22, CiteID L22307

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Seismology: Volcano Seismology (4302, 8419)

Scientific paper

We report on swarms of repeating long-period (LP) events with remarkably periodic occurrence at Deception Island volcano, Antarctica. The LP events show dominant frequencies near 2 Hz and characteristic inter-event times that range from ˜10 s to ˜20 s for individual swarms. We observe that LP inter-event times are approximate integer multiples of the dominant periods of the oceanic microseism, indicating a synchronization of LP activity with the phase of ocean noise. We attribute LP periodicity to the coincidence of sustained LP activity in an unstable hydrothermal system and external forcing by ocean noise that introduces periodic pressure variations in volcano fluids. We estimate the volumetric strain change generated by the oceanic microseism at the source location and conclude that strain of order 10-7 is sufficient to introduce clear periodicity in the LP sequences, and that periodicity increases with increasing strain.

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