Identifying ring geomorphic features in Lebanon using ASTER and Landsat 7 ETM+ images
Satellite images enable us to identify several geomorphologic features on the Earth's surface that could not be easily recognized on ground surface or by using conventional methods. This is mainly attributed to the optical advantages of remote sensing techniques. Thus, suspicious geomorphologic signatures can be observed on the terrain surface. These are mostly geologic-controlled. Linear aspects are given most attention in many geological studies to reflect subsurface, hidden structures. In this study, using ENVI-4.3 and ERDAS Imagine-9.1 software to analyse ASTER and Landsat 7 ETM+ images of Lebanon, we exposed a miscellany of geomorphic ring structures on different geologic formations of the Lebanese terrain. The diameter of the recognized ring structures ranges from a few hundreds of metres to several kilometres. Preliminary field surveys were carried out on some of these structures in order to identify their origin. All the recognized structures are circular and semi-rounded in their geomorphology; however, they are attributed either to subsurface crust processes or to the impact of falling meteoritic from outer space. The former were indicated through rock deformations and existence of intrusive bodies. Meteorite impact was induced from the glassy and metallic materials prevailing within the ring structure area, as well as from the interference of some rings.
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Document Type: Research Article
Affiliations: Remote Sensing Center, National Council for Scientific Research, Beirut, Lebanon
Publication date: January 1, 2009