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

作者：Montgomery Brown E K; Wicks C W; Cervelli P F; Langbein J O; Svarc J L; Shelly D R; Hill D P; Lisowski M

来源：Geophysical Research Letters, 2015, 42(13): 5250-5257.

DOI：10.1002/2015GL064338

<jats:title>Abstract</jats:title><jats:p>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 × 10<jats:sup>6</jats:sup> m<jats:sup>3</jats:sup>/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.</jats:p>

• 出版日期2015-7-16