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

An extraordinary episode of Yellowstone caldera uplift, 2004-2010, from GPS and InSAR observations
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DOI:
10.1029/2010gl045451
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发表时间:
2010-12-03
影响因子:
5.2
通讯作者:
Puskas, Christine M.
Puskas, Christine M.
中科院分区:
地球科学1区
文献类型:
--
作者:
Chang, Wu-Lung;Smith, Robert B.;Puskas, Christine M.

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从2006年到2010年6月,黄石公园地面变形的大地测量显示,黄石火山口最近的隆起在2004年开始的前所未有的隆起时期之后减速。2006-2008年,北方和西南破火山口的抬升速率分别从7厘米/年降至5厘米/年和4厘米/年降至2厘米/年,2009年,同一地区的抬升速率进一步降至2厘米/年和0.5厘米/年。变形数据的弹性位错模型有力地表明,在地震成像结晶岩浆储层顶部附近7-10 km深度处有一个膨胀的岩床,2006年至2009年间体积膨胀率下降了60%。从东北破火山口下方的热液-火山补给减少和2008年和2010年大地震群的地震矩释放是减缓破火山口隆起的合理机制,并可能影响了近期破火山口运动从隆起到沉降的变化。引文:Chang,W.- L.,R. B。Smith、J. Farrell和C. M. Puskas(2010年),黄石火山口隆起的一个特殊事件,2004-2010年,来自GPS和干涉合成孔径雷达观测,地球物理学。保留信函:37,L23302,doi:10.1029/2010GL045451。
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.