| 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. |
