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. 2020 Jun 24;10:10296. doi: 10.1038/s41598-020-67220-1

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© The Author(s) 2020

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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Signals of the SVO strainmeter recorded before the July 3 and August 28, 2019 paroxysms. The magnified signal relating to the July 3 (top of the plot) is compared with the precursory effusive phase recorded by the cameras. (a) is the beginning of a strain increase (13:30:00 UTC); (b) marks the first minor lava overflows (13:46:00); (c) indicates a small vent opening at the base of NE crater, feeding a thin lava flow (14:00:30); (d) minimum strain (14:34:32); (e) automatic trigger (14:35:44); (f) small intra-crater lava flow (14:43:10); (g) paroxysmal explosion beginning (14:45:40). The INGV camera images at the top of the figure indicate the moments relative to the corresponding letters. b and c are camera images from the SQT camera (view from NE of the NE crater flank) and f camera image is from the SPT camera (view from South of the whole crater terrace). SQT and SPT are Q and P in Fig. 1, respectively. The software used to create the figure is Python 2.7 (https://www.python.org/).