Hydraulic pressure variations of groundwater in the gran sasso underground laboratory during the amatrice earthquake of August 24, 2016

Abstract

Since May 2015, hydraulic pressure, temperature and electrical conductivity of groundwater have been continuously monitored in the 200 m-long horizontal S13 borehole placed close to the deep underground INFN laboratory (Gran Sasso aquifer, Central Italy). A high sampling rate of the physical quantities up to 50 Hz was achieved with a 3-channel 24-bit ADC. From May 2015 to September 2016 (17 months) we registered hydraulic pressure signals from 12 earthquakes at different surface distances (from 12000 to 30 km) and different magnitudes (from 8.3 to 4.3 Mw). We present the first results obtained for the Amatrice mainshock, comparing the hydroseismograph recorded by the S13 hydraulic pressure device to the time history recorded at the GIGS station, both located in the deep core of the Gran Sasso carbonate aquifer.