Hi Luciana,

I read with interest the July–August 2008 article in SRL “Seismic Raves: Tremor observations from an electronic music festival,” by David N. Green and David Bowers. The authors describe harmonic signals recorded coincident with the 2007 Glade Festival and make an excellent case that the festival generated the 2–3 Hz signals.

However, I disagree with the conclusions in that I don't think the music itself caused the primary long-lived spectral lines. I think rather that steady machinery such as the power generators were responsible. In the article's Figure 5, for example, station BNST shows a line just above...

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