Abstract. We demonstrate the capability of Distributed Acoustic Sensing (DAS) in recording volcano related dynamic strain at Etna (Italy). In summer 2019, we gathered DAS measurements from a 1.5 km long fibre in a shallow trench and seismic records from a conventional dense array comprising 26 broadband sensors deployed in Piano delle Concazze close to the summit area. The multifaceted style of Etna activity during the acquisition period gives the extraordinary opportunity to record and detect tiny strain changes (few 10⁻⁸ strain) in correspondence with volcanic events. To validate the DAS strain measures, we explored array-derived methods to estimate strain changes from the seismic signals and to compare with strain DAS signals. A general good agreement was found between array-derived strain and DAS measures along the fibre optic cable. Short wavelength discrepancies correspond with fault zones, showing the potential of DAS in mapping local perturbations of the strain field, and thus site effect, due to small-scale heterogeneities in volcanic settings.

中文翻译：

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在埃特纳火山火山（意大利）上用密集地震仪阵列进行的光纤应变测量的比较

摘要。我们展示了分布式声学传感（DAS）在记录与火山相关的动态应变在埃特纳火山（意大利）的能力。在2019年夏季，我们收集了一条1.5公里长的浅沟槽中的光纤的DAS测量数据，以及来自传统密集阵列的地震记录，该密集阵列包括26个宽带传感器，部署在靠近峰顶区的皮亚诺·德尔孔卡泽。采集期间埃特纳火山活动的多方面风格为记录和检测微小的应变变化提供了绝佳的机会（很少有10 ^-8应变）与火山事件相对应。为了验证DAS应变措施，我们探索了阵列派生的方法来估计地震信号中的应变变化并与DAS信号进行比较。在沿光纤电缆的阵列应变和DAS措施之间发现了一个总体良好的协议。短波长差异对应于断层带，显示了DAS在绘制应变场局部扰动以及潜在的现场效应方面的潜力，这归因于火山环境中的小规模异质性。