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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Soil gases and SAR measurements reveal hidden faults on the sliding flank of Mt. Etna (Italy)
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Soil gases and SAR measurements reveal hidden faults on the sliding flank of Mt. Etna (Italy)

机译：土壤气体和SAR测量结果揭示了Mt滑动面的隐伏断层。埃特纳火山（意大利）

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摘要

From October 2008 to November 2009, soil CO_2, radon and structural field surveys were performed on Mt. Etna, in order to acquire insights into active tectonic structures in a densely populated sector of the south-eastern flank of the volcano, which is involved in the flank dynamics, as highlighted by satellite data (InSAR). The studied area extends about 150 km~2, in a sector of the volcano where InSAR results detected several lineaments that were not well-defined from previous geological surveys. In order to validate and better constrain these features with ground data evidences, soil CO_2 and soil radon measurements were performed along transects roughly orthogonal to the newly detected faults, with measurement points spaced about 100 m. In each transect, the highest CO_2 values were found very close to the lineaments evidenced by InSAR observations. Anomalous soil CO_2 and radon values were also measured at old eruptive fractures. In some portions of the investigated area soil gas anomalies were rather broad over transects, probably suggesting a complex structural framework consisting of several parallel volcano-tectonic structures, instead of a single one. Soil gas measurements proved particularly useful in areas at higher altitude on Mt. Etna (i.e. above 900 m asl), where InSAR results are not very informative/ are fairly limited, and allowed recognizing the prolongation of some tectonic lineaments towards the summit of the volcano. At a lower altitude on the volcanic edifice, soil gas anomalies define the active structures indicated by InSAR results prominently, down to almost the coastline and through the northern periphery of the city of Catania. Coupling InSAR with soil gas prospecting methods has thus proved to be a powerful tool in detecting hidden active structures that do not show significant field evidences.
机译：从2008年10月到2009年11月，在Mt. Mt进行了土壤CO_2，ra和结构野外调查。埃特纳火山（Etna），以获取有关火山东南翼密集区域扇形活动构造结构的见解，这与卫星动力学有关，卫星数据（InSAR）强调了这一点。被研究的区域在火山的一个区域中延伸了大约150 km〜2，在InSAR结果中发现了一些先前地质调查未明确界定的地貌。为了用地面数据证据验证和更好地限制这些特征，沿着大致正交于新发现的断层的样条进行了土壤CO_2和土壤ra测量，测量点间隔约100 m。在每个样带中，发现最高的CO_2值非常接近InSAR观测所证明的谱系。在旧的爆发性裂缝处也测量了异常的土壤CO_2和ra值。在被调查区域的某些部分，样气在样带上的异常范围很广，这可能表明它是一个复杂的结构框架，由几个平行的火山-构造结构组成，而不是一个。事实证明，土壤气体测量在山上海拔较高的地区特别有用。埃特纳火山（即高于900 m asl），InSAR的结果不是十分有用/相当有限，并且可以识别一些构造构造向火山顶的延伸。在火山大厦较低的高度，土壤气体异常明显地定义了InSAR结果所指示的活动结构，直至几乎海岸线，一直延伸到卡塔尼亚市的北部边缘。因此，InSAR与土壤气体勘探方法的耦合已被证明是检测隐藏的活动结构的有效工具，这些活动结构未显示重要的现场证据。

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