Composition of Soil-Gas Efflux From the Artu Jawe Fault Zone, near Aluto volcano, Ethiopia. Data are referenced in Hutchison et al., 2016a: Causes of unrest at silicic calderas in the East African Rift: New constraints from InSAR and soil-gas chemistry at Aluto volcano, Ethiopia; https://doi.org/10.1002/2016GC006395.

The dataset contains details of field collection of soil gas samples with use of Supel Inert Foil gas sampling bags and the results of methane, ethane, carbon dioxide measurements performed within the environmental monitoring campaign in vicinity of abandoned boreholes on 2 Polish shale gas exploration sites where operations including hydraulic fracturing were conducted in 2010-2016 period.

The dataset contains details of field collection of test soil gas samples with use of Supel Inert Foil gas sampling bags and the results of methane and ethane measurements performed in order to validate a methodology of soil gas sampling and analysis. The dataset is not intended to be used for any site characterisation, sampling sites were chosen based on high probability of occurrence of measureable methane content in soil gas. Furthermore, the data will be used for formal procedure to obtain the methodology accreditation from the Polish Centre for Accreditation (PCA). The dataset might be used as a set of results of the analytical methodology in future field experimental works. However measurement data are related to particular soil types and beside validation/inter-comparison purpose are not reusable. The dataset was created within SECURe project (Subsurface Evaluation of CCS and Unconventional Risks) - https://www.securegeoenergy.eu/. This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 764531

Data contain reference measurements of methane concentration in soil gas samples for storage tests in sampling methodology evaluation and results of field measurements as well as laboratory tests of methane and carbon dioxide conducted on parallel to main set samples collected for monitoring observations on post-exploration shale gas sites in Poland for quality check and control.