Tidal Variation in Non Volcanic Seismic Tremor Activity at the Chile Triple Junction

Details Tidal Variation in Non Volcanic Seismic Tremor Activity at the Chile Triple Junction Tidal Variation in Non Volcanic Seismic Tremor Activity at the Chile Triple Junction

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.t21a0358g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #T21A-0358

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8111 Continental Tectonics: Strike-Slip And Transform, 8118 Dynamics And Mechanics Of Faulting (8004)

Scientific paper

We present evidence that non volcanic seismic tremor detected at Chile Ridge Subduction Project (CRSP) seismic network correlates with the semidiurnal (M2) tidal amplitude variation, enhanced by the lunar monthly (Mm) orbital cycle. Tremors were detected at 14 broadband seismic stations in the Los Chonos Archipelago and Taitao Peninsula by two methods: simple visual inspection of correlated tremor on seismograms at CRSP stations, and an automated search of the tremor frequency band (5-10 Hz). The two methods yield similar results. Analysis of two years of data (2005-2006) reveals a positive correlation (R = 0.76) between daily tremor duration and daily tidal variations, with a lag of 2.5 days between maximum tidal amplitude difference and tremor activity. The 28 day tidal cycle is produced by conjunction (New Moon), generating the highest and lowest tide amplitudes of the orbital cycle. Gravitational traction due to tidal acceleration is maximum near the latitude of the study region, and is enhanced by the ocean loading. At least two hypotheses could explain the correlation: stress cycling on the subducted Taitao and Darwin transform faults due to solid earth tide and ocean loading, leading to tremor generation; or enhanced hydrothermal activity during fluid release in the subducted Chile ridge structure.

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