Many islands of the Aegean Sea show strong geothermal activity due to volcanism in the area. In this paper, Robust Satellite Techniques (RST) are used to isolate, from other known possible sources, those thermal anomalies possibly related to geothermal activity in the Miocene volcanic field of Lesvos Island (Northern Aegean). For this purpose, 12 years (2003–2014) of daily Night-time Land Surface Temperature (LST) products, from Moderate Resolution Imaging Spectroradiometer (MODIS) acquisitions were analyzed. The final dataset contained 770 thermal anomalies whose spatial correlation with geological and structural data of Lesvos - such as caldera rims, ring faults, major tectonic lineaments and hydrothermal alterations mapped by processing SENTINEL-2 MSI satellite images – has been particularly investigated. In the approximately 20 ma geothermal field of Lesvos, geothermal activity seems to be also associated with the extensional regime of the broader area that leads to lithosphere thinning and consequent heat transfer in the multi-fractured terrain of Lesvos through volcanic and tectonic faults. Achieved results seem to confirm the possibility to use RST-based thermal anomalies to identify temporal variations in the geothermal activity probably due to the uplifting and circulation of the hydrothermal waters.

由于该地区的火山活动，爱琴海的许多岛屿都表现出强烈的地热活动。在本文中，使用了稳健卫星技术（RST）从其他已知的可能来源中分离了与莱斯沃斯岛（北爱琴海）中新世火山场中的地热活动有关的热异常。为此，分析了从中等分辨率成像光谱仪（MODIS）获得的12年（2003-2014年）每日夜间陆地温度（LST）产品。最终的数据集包含770个热异常，特别研究了其与Lesvos地质和结构数据的空间相关性，例如火山口边缘，环形断层，主要构造线和通过处理SENTINEL-2 MSI卫星图像绘制的热液蚀变。在Lesvos约20 ma的地热田中，地热活动似乎也与更广泛区域的扩张状态有关，导致岩石圈变薄，并因此在Lesvos的多裂隙地形中通过火山和构造断层传热。取得的成果似乎证实了使用基于RST的热异常来确定地热活动的时间变化的可能性，这可能是由于热液水的隆升和循环造成的。