<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Using the velocity of seismic waves estimated from ambient seismic noise\r\nto assess the results of hydro-fracturing and the exploitation of shale-rock\r\nformations"^^ . "Wysin-2-H is a well drilled in the so-called shale gas region of Pomerania, northern Poland. A seismic network\r\nwas constructed around the well to study the seismic effects of activating of shale gas deposits by hydro-fracturing.\r\nThe network was also used for the measurements of seismic noise, although the net was not specifically designed\r\nfor this purpose.\r\nThe seismic noise directivity strongly influences the structure of correlograms. Therefore, this issue was re-\r\nsearched intensively. It is presented that arrival times of strong signals in the time intervals greater than 1 month\r\nin frequency range 0,1 – 0,4 Hz are not disturbed by movement of source of seismic noise.\r\nDue to presence of strong reflector in geological structure of Wysin region, the coda waves are reflected downward\r\nand cannot be recorded by the network. It is shown that the only waves recorded in longer time lags, which have\r\nsignals visible on the correlograms, are horizontal waves recorded in one station. Using these waves, accuracy of\r\nestimation of the relative velocity changes in geological strata is approximately 0,05 %.\r\nDespite the depth of the shale gas deposits estimated for about 4000 m, it was assumed that correlograms\r\ncalculated for the seismic data before hydro-fracturing and correlograms for the data after activation of shale gas\r\ndeposits, with high gas production rate, should vary significantly and provide useful information about velocity\r\nchanges.\r\nDue to complicated structure of shale gas deposits there was no meaningful gas output from the Wysin well.\r\nHence, the measurements of seismic noise have not indicate the changes of the velocity distribution before and\r\nafter hydro-fracturing."^^ . "2017-04" . . . . . . . . . . . . "Janusz"^^ . "Mirek"^^ . "Janusz Mirek"^^ . . "Mateusz"^^ . "Lasak"^^ . "Mateusz Lasak"^^ . . "Henryk"^^ . "Marcak"^^ . "Henryk Marcak"^^ . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland"^^ . . . . . "EGU General Assembly 2017"^^ . . . . . "Vienna, Austria"^^ . . . . . . "Using the velocity of seismic waves estimated from ambient seismic noise\r\nto assess the results of hydro-fracturing and the exploitation of shale-rock\r\nformations (Slideshow)"^^ . . . . "Marcak_et_al_2017_Using_the_velocity_of_seismic_waves_estimated_from_ambient_seismic_noise_Presentation.ppt"^^ . . "HTML Summary of #1985 \n\nUsing the velocity of seismic waves estimated from ambient seismic noise \nto assess the results of hydro-fracturing and the exploitation of shale-rock \nformations\n\n" . "text/html" . . . "Wysin" . . . "Unconventional hydrocarbon extraction" . . . "Method and procesing" . .