Publication Date

2013-04-12

Availability

Open access

Embargo Period

2013-04-12

Degree Type

Dissertation

Degree Name

Doctor of Philosophy (PHD)

Department

Marine Geology and Geophysics (Marine)

Date of Defense

2012-06-15

First Committee Member

Keir Becker

Second Committee Member

Timothy Dixon

Third Committee Member

Guoqing Lin

Fourth Committee Member

Earl E. Davis

Abstract

Pressure data recorded by long-term subseafloor observatories (CORKs) are a useful tool for understanding the state of the crustal hydrologic system. In Middle Valley, a sedimented rift at the northern end of the Juan de Fuca Ridge, thickly sedimented basaltic crust hosts an array of hydrologic regimes that have been monitored continuously by two CORKs since 1996. This dissertation analyzes both recent trends in borehole and seafloor pressures, as well as several older datasets, in concert with local seismicity, physical properties of the crust, and hydrothermal circulation in an effort to understand the region’s ongoing dynamic eruptive cycle and hydrogeologic connectivity.

Keywords

ocean drilling; hydrothermal systems; borehole observatories; marine geophysics; crustal hydrogeology

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