Ground Gravity Survey At Long Valley Caldera Geothermal Area (Laney, 2005)

GEOTHERMAL ENERGY

=====

Exploration Activity: Ground Gravity Survey At Long Valley Caldera Geothermal Area (Laney, 2005)

Exploration Activity Details
Location	Long Valley Caldera Geothermal Area
Exploration Technique	Ground Gravity Survey
Activity Date	- 2004
Usefulness	not indicated
DOE-funding	Unknown

Exploration Basis

The Long Valley information appears to be a very small subsection of this larger report.

Notes

"Localized Strain as a Discriminator of Hidden Geothermal Systems, Vasco and Foxall, 2005. Recent work has focused on (1) collaborating with Alessandro Ferretti to use Permanent Scatterer (PS) InSAR data to infer strain at depth, (2) working with Lane Johnson to develop a dynamic faulting model, and (3) acquiring InSAR data for the region surrounding the Dixie Valley fault zone in collaboration with Dr. William Foxall of LLNL. The InSAR data have been processed and an initial interpretation of the results is ongoing. In particular, we have InSAR stacks for over twenty pairs of scenes. The use of PS data and the development of data processing techniques, such as stacking, is critical for imaging slowly varying regional strains over many years. Dr. Ferretti has developed an effective processing technique to identify permanent scatterers and observe their motion with sub-centimeter accuracy. (4) Studying the role that faults play in controlling flow in hydrothermal/magmatic systems I have completed a study of fault-fluid interaction at the Yellowstone caldera. I have also been working on leveling, GPS, EDM, and gravity data from Long Valley, California. The inversion of the deformation data has allowed us to show those faults which appear to be controlling flow at depth."

References

• Patrick Laney (2005) Federal Geothermal Research Program Update - Fiscal Year 2004