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In a report published in Advances in Space Research, Nenovski et\udal. (2015) analyse ionospheric TEC (total electron content) data from GPS\udmeasurements around the time of the 6 April 2009 Mw 6. 1 L'Aquila\ud(Italy) earthquake. According to the authors, TEC difference (DTEC)\udcalculated from two GPS (Global Positioning\udSystem) receivers\udin central Italy shows a hump-like shape (an increase followed by a decrease)\udduring the hours just before and shortly after the main shock. They maintain\udthat the hump-like shape is anomalous and may be\udrelated to the earthquake. We show that the DTEC increase in the\udhours before the shock, as well as its subsequent slow decrease, does not have\udany characteristic that might support a possible relationship with the\udearthquake. We have also conducted our own independent analysis using the\udsame GPS data analysed by Nenovski et al. (2015). We have found a diurnal\udvariation in DTEC time series that shows hump-like shapes like that reported\udby Nenovski et al. (2015) throughout the investigated period. This\uddemonstrates that the hump-like shape in DTEC close to the time of the\ud6 April earthquake is not anomalous and cannot be considered a possible\udearthquake-related effect

On a reported effect in ionospheric TEC around the time of the 6 April 2009 L'Aquila earthquake