Gravitational potential energy and active deformation in the Apennines
Gravitational potential energy and active deformation in the Apennines
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DOI：
10.1016/j.epsl.2014.04.013
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发表时间：
2014-07-01
影响因子：
5.3
通讯作者：
Selvaggi, G.
中科院分区：
文献类型：
--
作者：
D'Agostino, N.;England, P.;Selvaggi, G.
我们使用的速度测量从一个网络的连续GPS站点跨越亚平宁半岛的意大利来测试的假设，该地区的主动变形解释的岩石圈的重力势能的变化。山脉的简单几何形状允许我们把变形当作二维的，忽略了沿着山脉走向的速度梯度。在这个假设下，岩石圈每单位面积的重力势能（GPE）在垂直于链的方向上的积分通过一个简单的表达式与相同方向上的速度相关联。我们发现，所观察到的速度匹配此表达式的RMS失配为0.5毫米/年。这一协议表明，亚平宁山脉的变形反映了平衡，在山脉本身，横向变化之间的GPE和变形岩石圈所需的应力。皮带外部过程产生的力不需要解释观察结果。(c)© 2014 Elsevier B. V.保留所有权利。
We use velocity measurements from a network of continuous GPS sites spanning the Apennines of peninsular Italy to test the hypothesis that the active deformation of the region is explained by variations in gravitational potential energy of the lithosphere. The simple geometry of the mountain chain allows us to treat the deformation as two-dimensional, neglecting gradients of velocity along the strike of the chain. Under this assumption, the integral of gravitational potential energy per unit area of the lithosphere (GPE) in the direction perpendicular to the chain is related by a simple expression to the velocity in the same direction. We show that the observed velocities match this expression with an RMS misfit of 0.5 mm/yr. This agreement suggests that deformation of the Apennines reflects a balance, within the mountain chain itself, between lateral variations in GPE and the stresses required to deform the lithosphere. Forces arising from processes external to the belt are not required to explain the observations. (c) 2014 Elsevier B.V. All rights reserved.