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Horizontal component of ED gradient corresponding to the bottom layer of voxels, the height of which ranges between 110 and 790 km and representing pierce points at mid-height of 450 km, (b) during day 2015-09-16: 16.5 min after EQ main shock, and (a) 1 day before the EQ at a similar time (2015-09-15, 23:11:00), computed with TOMION from the CSN and IGN networks of ground GNSS receivers.
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