An extraordinary episode of Yellowstone caldera uplift, 2004-2010, from GPS and InSAR observations

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Title:	An extraordinary episode of Yellowstone caldera uplift, 2004-2010, from GPS and InSAR observations
Authors:	Chang,WL;Smith,RB;Farrell,J;Puskas,CM
Contributors:	地球科學系
Keywords:	DEFORMATION;SUBSIDENCE;MIGRATION;INTRUSION;BENEATH
Date:	2010
Issue Date:	2012-03-27 17:36:16 (UTC+8)
Publisher:	國立中央大學
Abstract:	Geodetic measurements of Yellowstone ground deformation from 2006 to June 2010 reveal deceleration of the recent uplift of the Yellowstone caldera following an unprecedented period of uplift that began in 2004. In 2006-2008 uplift rates decreased from 7 to 5 cm/yr and 4 to 2 cm/yr in the northern and southwest caldera, respectively, and in 2009 rates further reduced to 2 cm/yr and 0.5 cm/yr in the same areas. Elastic-dislocation modeling of the deformation data robustly indicates an expanding sill at similar to 7-10 km depth near the top of a seismically imaged, crystallizing magma reservoir, with a 60% decrease in the volumetric expansion rate between 2006 and 2009. Reduction of hydrothermal-volcanic recharge from beneath the northeast caldera and seismic moment release of the 2008 and 2010 large earthquake swarms are plausible mechanisms for decelerating the caldera uplift and may have influenced the change in recent caldera motion from uplift to subsidence. Citation: Chang, W.-L., R. B. Smith, J. Farrell, and C. M. Puskas (2010), An extraordinary episode of Yellowstone caldera uplift, 2004-2010, from GPS and InSAR observations, Geophys. Res. Lett., 37, L23302, doi:10.1029/2010GL045451.
Relation:	GEOPHYSICAL RESEARCH LETTERS
Appears in Collections:	[地球科學學系] 期刊論文

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