| Abstract |
Investigations at Newberry Volcano, Oregon, have resulted in a satisfactory account of the shallow hydrothermal system, but have not indicated the nature of a possible geothermal reservoir. Hot springs in the caldera probably represent the return of circulation meteoric water, warmed at shallow depths by high conductive heat flow and by steam rising from greater depths. Groundwater recharge to the hydrothermal system is at most 250 liters per second, of which about 20 liters per second reappears in the hot springs. Analysis of temperature anomalies in a Geological Survey drill hole indicates that groundwater flow totaling about 125 liters per second could be moving laterally at depths of less that 650m at the drill site. A small fraction of the total recharge may infiltrate to a deeper high temperature reservoir whose existence has not yet been confirmed. |