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Abstract

The permanent GNSS station located at the Everest Pyramid Laboratory of EvK2CNR recorded its position coordinates during the earthquakes at the Gorkha (25 April 2015) and Ghorthali zones (12 May 2015) at an interval of every 30 s. The data recorded over three days prior to and after the earthquakes were analysed and the movement indicated a shifting of the GNSS station point from its original position every 30 s. From an accurate analysis of the coordinates of the station determined using GNSS Bernese software, it is possible to detect the movements of the station during the seismic events.

The shifts in the GNSS point were summed to provide an integral function (PIF, Pyramid Integral Function) that can be computed for each of the three components. Comparing them with the displacement record of the GURALP broadband seismic station (IO-EVN) of the OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, OGS, Trieste), located at the Pyramid, it is possible to establish a correlation, particularly with the vertical and north components; the maxima of the PIF coincide with the time of occurrence of the earthquakes.

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