Ground Gravity Survey At Long Valley Caldera Geothermal Area (Battaglia, Et Al., 2003)
Exploration Activity: Ground Gravity Survey At Long Valley Caldera Geothermal Area (Battaglia, Et Al., 2003)
|Exploration Activity Details|
|Location||Long Valley Caldera Geothermal Area|
|Exploration Technique||Ground Gravity Survey|
|Activity Date||- 2003|
Integrated modeling of deformation, microgravity, and seismic data was conducted in 2003 to investigate the cause of recent uplift of the resurgent dome.
Modeling of deformation and microgravity data suggests that there are two sources of subsurface inflation beneath the caldera, one between 7-10 km depth below the resurgent dome and a deeper source ~15 km below the caldera's south moat (Battaglia et al., 2003a,b). Data suggest that the shallower source is of intermediate density between magma and aqueous fluid, and so uplift of the resurgent dome may relate to pressure buildup associated with magmatic brine or gas sourced from deep beneath the caldera's south moat (Langbein, 2003; Hill et al., 2003). These ascending fluids would pool at or below the transition between brittle and ductile deformation conditions, inferred to occur at 6-7 km depth below the resurgent dome based on the depth of the apparent bottom of the seismogenic zone (Hill, 1992).
- M. Battaglia, P. Segall, J. Murray, P. Cervelli, J. Langbein (2003) The Mechanics of Unrest at Long Valley Caldera, California: 1. Modeling the Geometry of the Source Using Gps, Leveling and Two-Color EDM Data
- M. Battaglia, P. Segall, C. Roberts (2003) The Mechanics of Unrest at Long Valley Caldera, California. 2. Constraining the Nature of the Source Using Geodetic and Micro-Gravity Data
- John O. Langbein (2003) Deformation of the Long Valley Caldera, California: Inferences from Measurements from 1988 to 2001
- David P. Hill, John O. Langbein, Stephanie Prejean (2003) Relations Between Seismicity and Deformation During Unrest in Long Valley Caldera, California, from 1995 Through 1999
- David P. Hill (1992) Temperatures at the Base of the Seismogenic Crust Beneath Long Valley Caldera, California, and the Phlegrean Fields Caldera, Italy. In- Volcanic Seismology
- Christopher D. Farrar, Michael L. Sorey, Evelyn Roeloffs, Devin L. Galloway, James F. Howle, Ronald Jacobson (2003) Inferences On The Hydrothermal System Beneath The Resurgent Dome In Long Valley Caldera, East-Central California, USA, From Recent Pumping Tests And Geochemical Sampling