CO<sub>2</sub> Inflow and Elements Desorption Prior to a Seismic Sequence, Amatrice‐Norcia 2016, Italy

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  • T. Boschetti
    Dipartimento di Scienze Chimiche, della Vita e della Sostenibilità Ambientale University of Parma Parma Italy
  • M. Barbieri
    Dipartimento di Scienze della Terra Sapienza University of Rome Rome Italy
  • M. D. Barberio
    Dipartimento di Scienze della Terra Sapienza University of Rome Rome Italy
  • A. Billi
    Consiglio Nazionale delle Ricerche, IGAG Rome Italy
  • S. Franchini
    Dipartimento di Scienze della Terra Sapienza University of Rome Rome Italy
  • M. Petitta
    Dipartimento di Scienze della Terra Sapienza University of Rome Rome Italy

書誌事項

公開日
2019-05
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/2018gc008117
公開者
American Geophysical Union (AGU)

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説明

<jats:title>Abstract</jats:title><jats:p>The 2016 Mw ≥ 6.0 Amatrice‐Norcia earthquakes (central Apennines, Italy) and the related seismic sequence were associated with increases in arsenic and vanadium concentrations recorded in groundwater springs a few months before the earthquakes occurred. To evaluate these signals as reliable seismic precursors and effective predictive tools, we studied the geochemical processes that caused these anomalies. Using chemical and isotope models, we show that increased concentrations of arsenic and vanadium, a slight increase in boron concentrations, and a concomitant lowering of the boron isotope ratio may be due to mineral desorption (e.g., from iron oxides and/or clays). We argue that a displacing effect on the trace elements sorbed on minerals was triggered by an excess of deep CO<jats:sub>2</jats:sub> in groundwater, which occurred prior to the main seismic event as a result of preseismic crustal dilation. Our observations confirm the pivotal role of CO<jats:sub>2</jats:sub> in the release of trace elements by alteration of solid phases and provide a new understanding of earthquake‐related water chemical anomalies.</jats:p>

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