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. 2020 Oct 5;10:16487. doi: 10.1038/s41598-020-73102-3

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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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Spatial interpolation of the percent noise variation (PNV) for the case of W₁, W₂, W₃ and W₄. In each panel triangles mark the position of the 78 seismic stations, each colour coded according to its corresponding PNV and to the selected palette shown on the right side of the figure. White colour refers to a percent variation between − 10% and 10% that we consider a null change to encompass the error bars. Figure created using Matplotlib Basemap Toolkit⁴¹.