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. 2017 Nov 10;7:15296. doi: 10.1038/s41598-017-15499-y

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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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Seismic record during the “Encores” part of the Bruce Springsteen rock concert at FCB stadium (14/05/2016). (a) North-South component of the horizontal seismic acceleration Trace has been band-pass filtered between 1 and 10 Hz. (b) Corresponding spectrogram. Each song has a specific frequency content showing a fundamental frequency and harmonics. Titles of the songs are included for reference. (c) Particle motion of the horizontal components rotated to N50E/N140E during one of the Encores songs (marked by an arrow in the spectrogram). Each frame corresponds to 4 s. Some seconds after the beginning of the signal the phase shift between the fundamental and 1^st harmonic mode results in a PPM following a Lissajous curve.