Renewed inflation of Long Valley Caldera, California (2011 to 2014)

Geophysical Research Letters
By: , and 

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Abstract

Slow inflation began at Long Valley Caldera in late 2011, coinciding with renewed swarm seismicity. Ongoing deformation is concentrated within the caldera. We analyze this deformation using a combination of GPS and InSAR (TerraSAR-X) data processed with a persistent scatterer technique. The extension rate of the dome-crossing baseline during this episode (CA99 to KRAC) is 1 cm/yr, similar to past inflation episodes (1990–1995 and 2002–2003), and about a tenth of the peak rate observed during the 1997 unrest. The current deformation is well modeled by the inflation of a prolate spheroidal magma reservoir ∼7 km beneath the resurgent dome, with a volume change of ∼6 × 106 m3/yr from 2011.7 through the end of 2014. The current data cannot resolve a second source, which was required to model the 1997 episode. This source appears to be in the same region as previous inflation episodes, suggesting a persistent reservoir.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Renewed inflation of Long Valley Caldera, California (2011 to 2014)
Series title Geophysical Research Letters
DOI 10.1002/2015GL064338
Volume 42
Issue 13
Year Published 2015
Language English
Publisher American Geophysical Union
Publisher location Washington, DC
Contributing office(s) Volcano Science Center
Description 8 p.
First page 5250
Last page 5257
Country United States
State California
Other Geospatial Long Valley Caldera
Online Only (Y/N) N
Additional Online Files (Y/N) N