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Uplift and magma intrusion at Long Valley caldera from InSAR and gravity measurements

Geology

By:
, , , , , and
DOI: 10.1130/G25318A.1

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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.

Geospatial Extents

Additional Publication Details

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
Description:
4 p.
First page:
63
Last page:
66
Number of Pages:
4
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