The soundscape dynamics of human agglomeration
  We report a statistical analysis about people agglomeration soundscape. Specifically, we investigate the normalized sound amplitudes and intensities that emerge from people collective meetings. Our findings support the existence of nontrivial dynamics characterized by heavy tail distributions in the sound amplitudes, long-range correlations in the sound intensity and non-exponential distributions in the return interval distributions. Additionally, motivated by the time-dependent behavior present in the volatility/variance series, we compare the observational data with those obtained from a minimalist autoregressive stochastic model, a GARCH process, finding a good agreement. 
H. V. Ribeiro, R. T. de Souza, E. K. Lenzi, R. S. Mendes, L. R.   Evangelista
physics.soc-ph physics.data-an