<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland)"^^ . "Previous analysis to assess the monitoring performance of a dedicated seismic network are always useful to deter-\r\nmine its capability of detecting, locating and characterizing target seismicity. This work focuses on a hydrofracking\r\nexperiment in Poland, which is monitored in the framework of the SHEER (SHale gas Exploration and Exploita-\r\ntion induced Risks) EU project. The seismic installation is located near Wysin (Poland), in the central-western part\r\nof the Peribaltic synclise at Pomerania. The network setup includes a distributed network of six broadband stations,\r\nthree shallow borehole stations and three small-scale arrays. We assess the monitoring performance prior opera-\r\ntions, using synthetic seismograms. Realistic full waveform are generated and combined with real noise before\r\nfracking operations, to produce either event based or continuous synthetic waveforms. Background seismicity is\r\nmodelled by double couple (DC) focal mechanisms. Non-DC sources resemble induced tensile fractures opening in\r\nthe direction of the minimal compressive stress and closing in the same direction after the injection. Microseismic\r\nsources are combined with a realistic crustal model, distribution of hypocenters, magnitudes and source durations.\r\nThe network detection performance is then assessed in terms of Magnitude of Completeness (Mc) through two\r\ndifferent techniques: i) using an amplitude threshold approach, taking into account a station dependent noise level\r\nand different values of signal-to-noise ratio (SNR) and ii) through the application of an automatic detection al-\r\ngorithm to the continuous synthetic dataset. In the first case, we compare the maximal amplitude of noise free\r\nsynthetic waveforms with the different noise levels. Imposing the simultaneous detection at e.g. 4 stations for a\r\nrobust detection, the Mc is assessed and can be adjusted by empirical relationships for different SNR values. We\r\nfind that different source mechanisms have different detection threshold. The background seismicity (DC sources)\r\nis better detectable than induced earthquakes (tensile cracks mechanisms). Assuming a SNR of 2, we estimate a Mc\r\n∼ 0.55 around the fracking wells, with an increase of 0.05 during day hours. The value of Mc can be decreased to\r\n∼ 0.45 around the fracking region, taking advantage by the array installations. The second approach applies a full\r\nwaveform detection and location algorithm based on the stacking of smooth characteristic function and the identi-\r\nfication of high coherence in the signals recorded at different stations. In this case the detection can be increased\r\nat the cost of increasing also false detections, with an acceptable compromise found for Mc ∼ 0.1."^^ . "2017-04" . . . . . . . . . . . . . . . . . . . . . . . . "Stanislaw"^^ . "Lasocki"^^ . "Stanislaw Lasocki"^^ . . "Torsten"^^ . "Dahm"^^ . "Torsten Dahm"^^ . . "Janusz"^^ . "Mirek"^^ . "Janusz Mirek"^^ . . "Sebastian"^^ . "Heimann"^^ . "Sebastian Heimann"^^ . . "Marius"^^ . "Kriegerowski"^^ . "Marius Kriegerowski"^^ . . "Jose Angel"^^ . "Lopez-Comino"^^ . "Jose Angel Lopez-Comino"^^ . . "Simone"^^ . "Cesca"^^ . "Simone Cesca"^^ . . "GFZ German Research Centre for Geosciences, Section 2.1: Physics of Earthquakes and Volcanoes, Potsdam, Germany"^^ . . . "GFZ German Research Centre for Geosciences, Section 2.1: Physics of Earthquakes and Volcanoes, Potsdam, Germany"^^ . . . "GFZ German Research Centre for Geosciences, Section 2.1: Physics of Earthquakes and Volcanoes, Potsdam, Germany"^^ . . . "GFZ German Research Centre for Geosciences, Section 2.1: Physics of Earthquakes and Volcanoes, Potsdam, Germany"^^ . . . "GFZ German Research Centre for Geosciences, Section 2.1: Physics of Earthquakes and Volcanoes, Potsdam, Germany"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Krakow, Poland"^^ . . . "Institute of Geophysics, Polish Academy of Sciences, Krakow, Poland"^^ . . . . . "EGU General Assembly 2017"^^ . . . . . "Vienna, Austria"^^ . . . . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland) (Slideshow)"^^ . . . . . "Lopez_Comino_SHEER_EGU_2017.pdf"^^ . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland) (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland) (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland) (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland) (Other)"^^ . . . . . . "small.jpg"^^ . . . "Monitoring performance for hydraulic fracturing using synthetic\r\nmicroseismic catalogue at the Wysin site (Poland) (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #1984 \n\nMonitoring performance for hydraulic fracturing using synthetic \nmicroseismic catalogue at the Wysin site (Poland)\n\n" . "text/html" . . . "Source parameter estimation" . . . "Wysin" . . . "Unconventional hydrocarbon extraction" . .