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Development of an empirical ground-motion model for postmining induced seismicity near Gardanne, France

Gehl Pierre, Dominique Pascal, Aochi Hideo, Delatre Mickael, Kinscher Jannes, Contrucci Isabelle

Journal of Sustainable Mining

2024

Vol. 23, iss. 2

98--117

Since the closure of mining activities in 2003, the coal basin of Gardanne in South-East France has experienced thousands of small-magnitude earthquake events, mostly triggered by the flooding of mine workings. Some of these events have been powerful enough to be strongly felt by the population, generating nuisance and concern about potential damage to buildings. The aim of this study is to improve the characterisation of the level of ground motion at the surface, by developing a ground-motion model for post-mining induced seismicity, based on several years of recorded data. A Bayesian-based method is applied to the data in order to account for uncertainties in the estimation of moment magnitude. Station-to-station ground-motion site terms are also quantified for the nine recording stations in the area, thus providing additional information on the local site conditions. The developed model is compared to existing prediction equations for seismicity induced by other types of anthropic activities, confirming the need for a specific model in the case of post-mining induced seismicity. Finally, the Gardanne ground-motion model is also integrated with a shake-map procedure, showing how this predictive model may be merged with recorded data in order to generate rapid estimates of shaking levels in the area.

European feedback on post-mining seismicity

Contrucci Isabelle, Namjesnik Dalija, Niemz Peter, Primo Paloma, Kotyrba Andrzej, Mutke Grzegorz, Konicek Petr, Dominique Pascal, Rudolph Tobias, Möllerherm Stefan, Kinscher Jannes, Klein Emmanuelle, Cesca Simone

Journal of Sustainable Mining

2023

Vol. 22. iss. 3

195--218

Following the Paris Agreement adopted in 2015, Europe has committed to reducing its greenhouse gas emissions. In this context, the abandonment of coal as an energy source, both in terms of consumption and production, will lead to the closure of many mines in the years to come. Mine closure guidelines to manage residual mining risks already exist in European countries. However, they do not include post-mining seismic risk management due to a lack of sufﬁcient studies and knowledge on this subject. After mining closure, the ﬂooding of the mining works leads to hydromechanical loading of the underground and, in the longer term, to diffusion and an increase in the pore pressure. These conditions can lead, in certain situations, to the reactivation of tectonic faults, which may cause seismic events strong enough to be felt on the surface or even produce damage. Events of lower magnitudes, usually attributed to the remobilization of old mining works, are referred to as post-mining seismic hazards. The European RFCS PostMinQuake project, which started in 2020, aims to study this hazard at ﬁve mining basins located in France, Germany, Poland and the Czech Republic, known to have experienced signiﬁcant seismicity during their operation. This analysis, based on the feedback of the partners of the project, aims to frame an inventory of the ﬁve studied mining basins, which all encounter post-mining seismicity problem today. Three basins out of ﬁve show events with local magnitudes of the order of 3-3.5, which took place between nine and thirteen years after the closure of the mines. Even though the magnitudes of these earthquakes are small to moderate, they are felt on the surface as they occur at shallow depths. In all of the considered countries, a national seismological network exists, however, none of them is fully dedicated to post-mining seismic monitoring. These networks generally consist of a sparse mesh of stations, which does not allow the detection of events of magnitude less than 1 and the location of events have high spatial uncertainties. France is not an exception, but it relies on microseismic monitoring to detect early signs of instability at the level of mining structures and to anticipate the possible appearance of surface disorders. Out of the ﬁve basins that are studied, the Gardanne basin, which has been monitored since 2008, is the most documented case study of post-mining seismicity. This article also shows the difﬁculty in identifying the key conditions and factors that can lead to the remobilization of faults.