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• W2473369834 abstract "The NW Bohemia/Vogtland region is characterized by currently ongoing geodynamic processeswithin the intracontinental lithospheric mantle. Among others, this activity results in the occurrence of mid-crustal earthquake swarms and CO2 degassing zones called mofettes. These two natural phenomenaare related to each other since it is considered that fluid flow and fluid-induced effective stress cantrigger earthquake swarms. At the Earth’s surface, they appear spatially separated, but their connection could be explained by the existence of pathways within the crust that allow efficient and permanent fluid transport. However, neither the structure nor the position of such pathways has been imaged yet.With this background, we used a matched field processing analysis within the NW Bohemia/Vogtlandregion to locate mofettes and investigate their characteristics. Considering the CO2 degassing process as the high-frequency noise source, we chose two different test sites: the Dolni Castkov Borehole, which is an artificial mofette that we used to validate the method, and the South Hartousov mofette field, a natural CO2 degassing area. On both sites, we measured seismic noise in continuous mode over several hours (7 hours to 9 hours) with a sampling frequency of 250 samples/second in multiple campaigns using an array of about 60 x 60 m2 with approximately 30 randomly distributed stations.For the matched field processing computation, the phase velocity c(w) of the study area is required, which we obtained from active seismic experiments with hammer blows as the source. The phase velocity varies between 200 m/s and 420 m/s for Dolni Castkov and between 100 m/s and 280 m/s for South Hartousov, both in a frequency interval of 7 Hz–60 Hz.With the matched field processing analysis at the artificial mofette in Dolni Castkov, we couldrelocate the noise source successfully. In the South Hartousov mofette field, we detected one dominantvertically extended noise source, probably a fluid pathway, as well as small matched field processingmaxima at the surface that can be related to a dry mofette." @default.
• W2473369834 created "2016-07-22" @default.
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• W2473369834 date "2016-03-01" @default.
• W2473369834 modified "2023-09-26" @default.
• W2473369834 title "Locating mofettes using seismic noise records from small dense arrays and matched field processing analysis in the NW Bohemia/Vogtland Region, Czech Republic" @default.
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• W2473369834 doi "https://doi.org/10.3997/1873-0604.2016024" @default.
• W2473369834 hasPublicationYear "2016" @default.
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