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. 2017 Aug 14;7:8099. doi: 10.1038/s41598-017-08192-7

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© 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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Time-dependent seismicity during the 1984 unrest. The symbols are the same used for Fig. 4. An isoline corresponding to $Q_{s}^{- 1} = 0.03$ is plotted on all maps between January and May and depicts the 4–4.5 deep high-attenuation anomaly. Panel (a) shows how the microseismicity progressively crosses the location of the last eruption, mainly following La Starza marine terrace. Panel b depicts the microearthquakes recorded on April 1: in this case, black (orange) circles are earthquakes recorded above (below) the maximum depth of the caprock¹⁴. The white ellipsoidal contour on the map and BB’ vertical section shows the area of densest microseismicity. In panel c, this same area becomes aseismic for 2 months. Almost no maximum likelihood hypocentres is located in the ellipsoid (left and right plots) while the PDF show a clear gap under Pozzuoli (central plot). Panel d depicts the end of the seismic unrest, with earthquakes repeatedly crossing the are of Mount Nuovo below the caprock (orange dots, see also the PDF) and following a NNW-SSE striking fault offshore^{21, 31}. The figure wa created using the same softwares and data described in Fig. 4 (ESRI ArcGIS 10.0^©, https://www.esri.com/training/catalog/5763042b851d31e02a43ed4d/using-arcmap-in-arcgis-desktop-10/; Voxler 3.0^©, http://www.goldensoftware.com/products/voxler; Photoshop CS^©, https://helpx.adobe.com/uk/x-productkb/policy-pricing/cs6-product-downloads.html; SeismicityViewer, http://alomax.free.fr/nlloc/.