Ground penetrating radar images of unexposed climbing dune-forms in the Ubehebe hydrovolcanic field (Death Valley, California)
Ground penetrating radar images of unexposed climbing dune-forms in the Ubehebe hydrovolcanic field (Death Valley, California)
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DOI：
10.1016/s0377-0273(01)00196-2
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发表时间：
2001-09-15
影响因子：
2.9
通讯作者：
Ulrych, TJ
中科院分区：
文献类型：
--
作者：
Cagnoli, B;Ulrych, TJ
在Ubehebe水火山区（加州的死亡谷）使用900兆赫天线进行了探地雷达勘测，从而获得了地下的高分辨率图像。这些测量旨在研究底潮沉积物中地下层序的横向相变化，并沿乌贝赫比火山口径向的流动方向沿着进行。探地雷达成像的沉积物，否则将难以研究，因为他们是在一个地区与很少露头。特别地，雷达轮廓示出了从相对近端到中间位置的波状反射的存在，其在远端位置中变得越来越不波状并且更加平面平行。波浪状的反射被解释为地表穿透雷达图像的地下列车攀登沙丘的形式，其大小减少下流。一个暴露在沟槽内的沙丘形态与波浪反射的波峰相对应，证实了这一解释。这些结果表明，地质雷达可以有效地整合传统的地质领域的研究。(C)2001 Elsevier Science Ltd保留所有权利。
Ground penetrating radar surveys were conducted in the Ubehebe hydrovolcanic field (Death Valley, California) using 900 MHz antennae, which allowed high-resolution images of the subsurface. The surveys were intended to study the lateral facies variation of subsurface sequences in base surge deposits and were run along a flow direction radial to the Ubehebe Crater. The ground penetrating radar imaged deposits that would otherwise be difficult to study because they are in an area with very few outcrops. In particular, the radar profiles show the presence of wavy reflections from relatively proximal to intermediate positions which become increasingly less wavy and more plane-parallel in distal locations. The wavy reflections have been interpreted as ground penetrating radar images of subsurface trains of climbing dune-forms, whose size decreases downflow. A climbing dune-form exposed inside a trench in correspondence to a crest of wavy reflections, confirms this interpretation. These results show that ground penetrating radar can usefully integrate traditional geologic field studies. (C) 2001 Elsevier Science Ltd All rights reserved.