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

Geophysical Research Letters
By: , and 



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.

Study Area

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