<> "The repository administrator has not yet configured an RDF license."^^ . <> . . . "Magnitude distribution complexity and variation at The Geysers geothermal field"^^ . "Earthquake magnitude (size) distribution is a major component required for seismic hazard\r\nassessment and therefore, the accurate determination of its functional shape and variation\r\nis a task of utmost importance. Although often considered as stationary, the magnitude distribution at particular sites may significantly vary over time and space. In this study, the\r\nwell-known Gutenberg–Richter (GR) law, which is widely assumed to describe earthquake\r\nmagnitude distribution, is tested for a case study of seismicity induced by fluid injection at\r\nThe Geysers (CA, USA) geothermal field. Statistical tests are developed and applied in order\r\nto characterize the magnitude distribution of a high quality catalogue comprising seismicity\r\ndirectly associated with two injection wells, at the north western part of The Geysers. The\r\nevents size distribution variation is investigated with respect to spatial, temporal, fluid injection\r\nand magnitude cut-off criteria. A thorough spatio-temporal analysis is performed for defining\r\nseismicity Clusters demonstrating characteristic magnitude distributions which significantly\r\ndiffer from the ones of the nearby Clusters. The magnitude distributions of the entire seismic\r\npopulation as well as of the individual Clusters are tested for their complexity in terms of\r\nexponentiality, multimodal and multibump structure. Then, the Clusters identified are further\r\nprocessed and their characteristics are determined in connection to injection rate fluctuations.\r\nThe results of the analysis clearly indicate that the entire magnitude distribution is definitely\r\ncomplex and non-exponential, whereas subsequent periods demonstrating significantly diverse\r\nmagnitude distributions are identified. The regional seismicity population is divided into three\r\nmajor families, for one of which exponentiality of magnitude distribution is clearly rejected,\r\nwhereas for the other two the GR law b-value is directly proportional to fluid injection. In\r\naddition, the b-values of these Families seem to be significantly magnitude dependent, a fact\r\nthat is of major importance for seismic hazard assessment implementations. To conclude, it\r\nis strongly suggested that magnitude exponentiality must be tested before proceeding to any\r\nb-value calculations, particularly in anthropogenic seismicity cases where complex and time\r\nchangeable processes take place."^^ . "2020-05-01" . . "222" . "2" . . "Oxford University Press"^^ . . . "Geophysical Journal International"^^ . . . "0956540X" . . . . . "Konstantinos Michail"^^ . "Leptokaropoulos"^^ . "Konstantinos Michail Leptokaropoulos"^^ . . "Institute of Geophysics, Polish Academy of Sciences, Warsaw, Poland"^^ . . . . . . "HTML Summary of #2261 \n\nMagnitude distribution complexity and variation at The Geysers geothermal field\n\n" . "text/html" . . . "Collective properties of seismicity" . . . "Geysers" . . . "Geothermal energy production" . .