<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Modelling fluid-induced seismicity rates associated with fluid injections: examples related to fracture stimulations in geothermal areas"^^ . "In this paper, we present a model for describing relationships between fluid-induced seismic-\r\nity and operational parameters of fluid injections. Considering seismic sequences occurring\r\nduring sustained fluid injections, we present a novel covariate approach in which a probability\r\ndistribution is defined as a basic template function for modelling the interevent times (i.e.\r\nthe time intervals between consecutive events), and the possible dependencies on operational\r\nparameters are modelled writing the parameters of the probabilistic model in terms of deter-\r\nministic functions of explanatory covariates that are selected from the operational data. The\r\nimplemented model is tested using data from two cases of reservoir stimulations in geother-\r\nmal systems (The Geysers, US and Cooper Basin, Australia). We have found that a template\r\nexponential distribution of interevent times, with a linear function relating the logarithm of\r\nthe distribution’s\r\nμ\r\nparameter and the logarithm of the injection rate, is the model that better\r\ndescribes the observations in all the analysed cases. This result suggests that the\r\nμ\r\nparameter\r\nand the injection rate have a power-law relationship. The value of the power-law exponent,\r\nα\r\n1\r\n,\r\nis an indicator of the relative change in the seismicity rate associated with a relative change\r\nin the injection rate, and it results particularly important for understanding the behaviour of\r\nseismicity at high injection rates.\r\nα\r\n1\r\n=−\r\n1 indicates the special case of a linear relationship\r\nbetween seismicity rate and injection rate (which usually is the model assumed in the litera-\r\nture); conversely,\r\nα\r\n1\r\n>\r\n−\r\n1(\r\nα\r\n1\r\n<\r\n−\r\n1) indicates that the relative change in the seismicity rate\r\nassociated with a relative change in the injection rate is lower (higher) than the relative change\r\nexpected by assuming a linear relationship between these two parameters. Regarding the cases\r\nanalysed in this paper, the exponent of the power law varies between\r\n−\r\n1.04 and\r\n−\r\n0.78 in The\r\nGeysers, and between\r\n−\r\n1.22 and\r\n−\r\n0.73 in Cooper Basin. While no clear temporal trends are\r\nobservable in the\r\nα\r\n1\r\nvalues obtained for The Geysers, in Cooper Basin\r\nα\r\n1\r\nincreased as the\r\nstimulation tests proceeded (from an initial value of\r\nα\r\n1\r\n=−\r\n1.22 calculated for the first fracture\r\ninitiation test to\r\nα\r\n1\r\n=−\r\n0.73 associated with the third fracture initiation test). This behaviour\r\ncan be a consequence of the so-called Kaiser effect indicating that, to trigger events, the pore\r\npressure during new injections must exceed the values already reached in previous injection\r\noperations. Finally, we also studied the gradual decline of seismicity rates in the post-injection\r\nphases in Cooper Basin using the modified Omori law. We explored this data set for looking,\r\nin particular, if there exists a pattern between the parameters controlling the post-injection\r\nseismicity decay rate and the characteristics of the precedent fluid injection."^^ . "2018" . . "215" . "1" . . "Oxford University Press"^^ . . . "Geophysical Journal International"^^ . . . "0956540X" . . . . . "Alexander"^^ . "Garcia-Aristizabal"^^ . "Alexander Garcia-Aristizabal"^^ . . "Istituto Nazionale di Geofisica e Vulcanologia"^^ . . . . . . "HTML Summary of #2124 \n\nModelling fluid-induced seismicity rates associated with fluid injections: examples related to fracture stimulations in geothermal areas\n\n" . "text/html" . . . "Technology-seismicity interaction" . . . "Copper Basin" . . . "Geysers" . . . "Geothermal energy production" . .