Steady downslope movement on the western flank of Arenal volcano, Costa Rica
Steady downslope movement on the western flank of Arenal volcano, Costa Rica
复制标题
哥斯达黎加阿雷纳尔火山西侧的稳定下坡运动
DOI：
10.1029/2010gc003263
复制
发表时间：
2010
期刊：
影响因子：
3.7
通讯作者：
F. Amelung
中科院分区：
文献类型：
--
作者：
S. Ebmeier;Juliet Biggs;T. Mather;G. Wadge;F. Amelung
火山的形成是一种独特的变形环境，不仅取决于活火山过程，还取决于其成分、结构和形态。我们利用2005年至2009年期间根据ALOS和RadarSat数据绘制的干涉图测量了哥斯达黎加Volcán阿纳尔的变形。火山的西翼以低于水平面0.55 °的角度向下倾斜，并以至少0.77厘米/年的速度持续移动。我们使用的模式，速度和运动方向来测试其起源的几个假设。我们倾向的解释是，它沿着一个浅的滑动面蠕动，很可能是1968年侧向爆炸喷发后的沉积物与下面较老的熔岩和古土壤之间的界面。我们对斜坡运动的测量增加了一小部分对火山重力驱动变形的速率测量，并且在其相对较高的速率和浅起源方面都很独特。观测阿纳尔的变形有助于评估阿纳尔周围的特殊危险，更普遍地说，有助于研究年轻的成层火山的稳定性。
The edifice of a volcano is a unique deformational environment, dependent not just on active volcanic processes but also on its composition, structure, and morphology. We measured the deformation of Volcán Arenal, Costa Rica, using interferograms constructed from both ALOS and RadarSat data between 2005 and 2009. The volcano's western flanks are moving downslope at an angle of ∼55° below the horizontal plane and a consistent rate of at least ∼7 cm/yr. We use the pattern, rate, and direction of motion to test several hypotheses for its origin. Our favored explanation is creep along a shallow sliding plane, most likely the interface between deposits postdating the 1968 lateral blast eruption and the older lavas and paleosoils beneath. Our measurement of slope movement adds to a small set of rate measurements for gravity‐driven deformation at volcanoes and is distinctive in both its relatively high rate and shallow origin. Observation of deformation at Arenal contributes both to the assessment of particular hazards around Arenal itself and, more generally, to the study of the stability of young stratovolcanoes.