Study of Volcanic Sources at Long Valley Caldera, California, Using Gravity Data and a Genetic Algorithm Inversion Technique

2004 ◽  
Vol 161 (7) ◽  
pp. 1399-1413 ◽  
Author(s):  
M. Charco ◽  
J. Fern�ndez ◽  
K. Tiampo ◽  
M. Battaglia ◽  
L. Kellogg ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Gravity Data ◽  
Long Valley Caldera ◽  
Inversion Technique ◽  
Long Valley

scholarly journals A New Analysis of Caldera Unrest through the Integration of Geophysical Data and FEM Modeling: The Long Valley Caldera Case Study

2021 ◽  
Vol 13 (20) ◽  
pp. 4054
Author(s):  
Fabio Pulvirenti ◽  
Francesca Silverii ◽  
Maurizio Battaglia
Keyword(s):  
Sierra Nevada ◽  
Volume Fraction ◽  
Gravity Data ◽  
Deformation Source ◽  
Hydrothermal Fluids ◽  
Gravity Potential ◽  
Baseline Length ◽  
Fem Modeling ◽  
Long Valley Caldera ◽  
Long Valley

The Long Valley Caldera, located at the eastern edge of the Sierra Nevada range in California, has been in a state of unrest since the late 1970s. Seismic, gravity and geodetic data strongly suggest that the source of unrest is an intrusion beneath the caldera resurgent dome. However, it is not clear yet if the main contribution to the deformation comes from pulses of ascending high-pressure hydrothermal fluids or low viscosity magmatic melts. To characterize the nature of the intrusion, we developed a 3D finite element model which includes topography and crust heterogeneities. We first performed joint numerical inversions of uplift and Electronic Distance Measurement baseline length change data, collected during the period 1985–1999, to infer the deformation-source size, position, and overpressure. Successively, we used this information to refine the source overpressure estimation, compute the gravity potential and infer the intrusion density from the inversion of deformation and gravity data collected in 1982–1998. The deformation source is located beneath the resurgent dome, at a depth of 7.5 ± 0.5 km and a volume change of 0.21 ± 0.04 km3. We assumed a rhyolite compressibility of 0.026 ± 0.0011 GPa−1 (volume fraction of water between 0% and 30%) and estimated a reservoir compressibility of 0.147 ± 0.037 GPa−1. We obtained a density of 1856 ± 72 kg/m3. This density is consistent with a rhyolite melt, with 20% to 30% of dissolved hydrothermal fluids.

scholarly journals Joint interpretation of displacement and gravity data in volcanic areas. A test example: Long Valley Caldera, California

2001 ◽  
Vol 28 (6) ◽  
pp. 1063-1066 ◽  
Author(s):  
J. Fernández ◽  
M. Charco ◽  
K. F. Tiampo ◽  
G. Jentzsch ◽  
J. B. Rundle
Keyword(s):  
Gravity Data ◽  
Long Valley Caldera ◽  
Long Valley ◽  
Joint Interpretation

Bibliography of literature pertaining to Long Valley Caldera and associated volcanic fields

2005 ◽  
Author(s):  
John W. Ewert ◽  
Christopher J. Harpel ◽  
Suzanna K. Brooks
Keyword(s):  
Long Valley Caldera ◽  
Long Valley ◽  
Volcanic Fields

NEW AIRBORNE LIDAR IMAGERY OF THE INYO DOMES AND INYO CRATERS, LONG VALLEY CALDERA, CALIFORNIA

2017 ◽  
Author(s):  
Graham D.M. Andrews ◽  
◽  
Abigail E. Martens ◽  
William Krugh ◽  
Sarah R. Brown
Keyword(s):  
Airborne Lidar ◽  
Long Valley Caldera ◽  
Long Valley

Multi-hazard perceptions at Long Valley Caldera, California, USA

2020 ◽  
pp. 101955
Author(s):  
Justin B. Peers ◽  
Michael K. Lindell ◽  
Christopher E. Gregg ◽  
Ashleigh K. Reeves ◽  
Andrew T. Joyner ◽  
...  
Keyword(s):  
Long Valley Caldera ◽  
Long Valley
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