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Hydrogeochemical changes before and during the 2016 Amatrice-Norcia seismic sequence (central Italy)

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      Abstract

      Seismic precursors are an as yet unattained frontier in earthquake studies. With the aim of making a step towards this frontier, we present a hydrogeochemical dataset associated with the 2016 Amatrice-Norcia seismic sequence (central Apennines, Italy), developed from August 24th, with an Mw 6.0 event, and culminating on October 30th, with an Mw 6.5 mainshock. The seismic sequence occurred during a seasonal depletion of hydrostructures, and the four strongest earthquakes (Mw ≥ 5.5) generated an abrupt uplift of the water level, recorded up to 100 km away from the mainshock area. Monitoring a set of selected springs in the central Apennines, a few hydrogeochemical anomalies were observed months before the onset of the seismic swarm, including a variation of pH values and an increase of As, V, and Fe concentrations. Cr concentrations increased immediately after the onset of the seismic sequence. On November 2016, these elements recovered to their usual low concentrations. We interpret these geochemical anomalies as reliable seismic precursors for a dilational tectonic setting.

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            Author and article information

            Affiliations
            [1 ]GRID grid.7841.a, Dipartimento di Scienze della Terra, Sapienza University of Rome, ; Rome, Italy
            [2 ]ISNI 0000 0001 1940 4177, GRID grid.5326.2, Consiglio Nazionale delle Ricerche, IGAG, ; Rome, Italy
            [3 ]ISNI 0000 0001 2300 5064, GRID grid.410348.a, Istituto Nazionale di Geofisica e Vulcanologia, ; Rome, Italy
            Contributors
            andrea.billi@cnr.it
            Journal
            Sci Rep
            Sci Rep
            Scientific Reports
            Nature Publishing Group UK (London )
            2045-2322
            15 September 2017
            15 September 2017
            2017
            : 7
            28916778
            5601465
            11990
            10.1038/s41598-017-11990-8
            © The Author(s) 2017

            Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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