Earthquake-induced changes in a hydrothermal system on the Juan de Fuca mid-ocean ridge

H. Paul Johnson, Michael Hutnak, Robert P. Dziak, Christopher G. Fox, Istvan Urcuyo, James P. Cowen, John Nabelek, Charles Fisher

Research output: Contribution to journalArticle

128 Scopus citations

Abstract

Hydrothermal vents on mid-ocean ridges of the northeast Pacific Ocean are known to respond to seismic disturbances, with observed changes in vent temperature. But these disturbances resulted from submarine volcanic activity; until now, there have been no observations of the response of a vent system to non-magmatic, tectonic events. Here we report measurements of hydrothermal vent temperature from several vents on the Juan de Fuca ridge in June 1999, before, during and after an earthquake swarm of apparent tectonic origin. Vent fluid temperatures began to rise 4-11 days after the first earthquake. Following this initial increase, the vent temperatures oscillated for about a month before settling down to higher values. We also observed a tenfold increase in fluid output from the hydrothermal system over a period of at least 80 days, extending along the entire ridge segment. Such a large, segment-wide thermal response to relatively modest tectonic activity is surprising, and raises questions about the sources of excess heat and fluid, and the possible effect on vent biological communities.

Original languageEnglish (US)
Pages (from-to)174-177
Number of pages4
JournalNature
Volume407
Issue number6801
DOIs
StatePublished - Sep 14 2000

All Science Journal Classification (ASJC) codes

  • General

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