Systematic along-axis tidal triggering of microearthquakes observed at 9°50′N East Pacific Rise

Details Systematic along-axis tidal triggering of microearthquakes observed at 9°50′N East Pacific Rise Systematic along-axis tidal triggering of microearthquakes observed at 9°50′N East Pacific Rise

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3618302s&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 18, CiteID L18302

Physics

Geophysics

5

Marine Geology And Geophysics: Hydrothermal Systems (0450, 1034, 3616, 4832, 8135, 8424), Seismology: Mid-Ocean Ridges, Seismology: Earthquake Source Observations (1240), Hydrology: Rocks: Physical Properties

Scientific paper

Hydrothermal fluid circulation at mid-ocean ridges facilitates the exchange of heat and chemicals between the oceans and the solid Earth, and supports chemosynthetic microbial and macro-faunal communities. The structure and evolution of newly formed oceanic crust plays a dominant role in controlling the character and longevity of hydrothermal systems; however, direct measurements of subsurface processes remain technologically challenging to obtain. Previous studies have shown that tidally-induced stresses within the subseafloor modulate both fluid flow and microearthquake origin times. In this study, we observe systematic along-axis variations between peak microearthquake activity and maximum predicted tidal extension beneath the hydrothermal vent site at 9°50′N East Pacific Rise. We interpret this systematic triggering to result from pore-pressure perturbations propagating laterally through the hydrothermal system. Based on our observations and a one-dimensional pore pressure perturbation model, we estimate bulk permeability at ˜10-13 to 10-12 m2 within layer 2B over a calculated diffusive lengthscale of 2.0 km.

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