Uplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements
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Abstract
The Long Valley caldera (California) formed ~760,000 yr ago following the massive eruption of the Bishop Tuff. Postcaldera volcanism in the Long Valley volcanic field includes lava domes as young as 650 yr. The recent geological unrest is characterized by uplift of the resurgent dome in the central section of the caldera (75 cm in the past 33 yr) and earthquake activity followed by periods of relative quiescence. Since the spring of 1998, the caldera has been in a state of low activity. The cause of unrest is still debated, and hypotheses range from hybrid sources (e.g., magma with a high percentage of volatiles) to hydrothermal fluid intrusion. Here, we present observations of surface deformation in the Long Valley region based on differential synthetic aperture radar interferometry (InSAR), leveling, global positioning system (GPS), two-color electronic distance meter (EDM), and microgravity data. Thanks to the joint application of InSAR and microgravity data, we are able to unambiguously determine that magma is the cause of unrest.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Uplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements |
| Series title | Geology |
| DOI | 10.1130/G25318A.1 |
| Volume | 37 |
| Issue | 1 |
| Year Published | 2009 |
| Language | English |
| Publisher | Geological Society of America |
| Contributing office(s) | Volcano Hazards Program |
| Description | 4 p. |
| First page | 63 |
| Last page | 66 |
| Country | United States |
| State | California |
| Other Geospatial | Long Valley caldera |
| Datum | North American Datum of 1927 |
| Projection | Universal Transverse Mercator |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |