Tidal triggering of microearthquakes on the Juan de Fuca Ridge | Zendy

Wilcock William S. D. | Zendy

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Tidal triggering of microearthquakes on the Juan de Fuca Ridge

Author(s) -

Wilcock William S. D.

Publication year - 2001

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2001gl013370

Subject(s) - geology , ridge , seismology , extensional definition , oceanography , tectonics , paleontology

Tidal stresses beneath the oceans can be up to an order of magnitude higher than those found in the continents because of the effects of loading by ocean tides. I have analyzed 1899 microearthquakes recorded during a 55‐day experiment on the Endeavour segment of the Juan de Fuca Ridge for tidal triggering. The tidal phase of the full data set and of a declustered subset comprising 987 events appears non‐random to a high level of confidence. Earthquakes occur more frequently near low tides, especially the lowest spring tides, when the extensional stresses are a maximum in all directions.

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