Hydrological response to a seafloor spreading episode on the Juan de Fuca ridge View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2004-07

AUTHORS

Earl Davis, Keir Becker, Robert Dziak, John Cassidy, Kelin Wang, Marvin Lilley

ABSTRACT

Seafloor hydrothermal systems are known to respond to seismic and magmatic activity along mid-ocean ridges, often resulting in locally positive changes in hydrothermal discharge rate, temperature and microbial activity, and shifts in composition occurring at the time of earthquake swarms and axial crustal dike injections1,2,3,4,5,6,7,8,9,10. Corresponding regional effects have also been observed11. Here we present observations of a hydrological response to seafloor spreading activity, which resulted in a negative formation-fluid pressure transient during and after an earthquake swarm in the sediment-sealed igneous crust of the Middle Valley rift of the northernmost Juan de Fuca ridge. The observations were made with a borehole seal and hydrologic observatory originally established in 1991 to study the steady-state pressure and temperature conditions in this hydrothermally active area12,13. The magnitude of the co-seismic response is consistent with the elastic strain that would be expected from the associated earthquakes, but the prolonged negative pressure transient after the swarm is surprising and suggests net co-seismic dilatation of the upper, permeable igneous crust. The rift valley was visited four weeks after the onset of the seismic activity, but no signature of increased hydrothermal activity was detected in the water column. It appears that water, not magma, filled the void left by this spreading episode. More... »

PAGES

335-338

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/nature02755

DOI

http://dx.doi.org/10.1038/nature02755

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1018746525

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15254534


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