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On October 18, 2021, an earthquake of magnitude Mw 3.7 occurred at 12:54:17 (UTC) 2 km East from Visso, Macerata, Italy, with geographical coordinates (lat, lon) 42.929, 13.113 and at one depth of 10 km. This earthquake had been preceded a few days by a series of electromagnetic signals coming from the seismic epicenter and its immediate vicinity.
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Cataldi et al. (2022) studied this question.
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