L. Ceranna¹ , P. Hupe¹ , A. Le Pichon²

¹Federal Institute for Geosciences and Natural Resources (BGR)
²Commissariat à l’énergie atomique et aux énergies alternatives (CEA)

Abstract:

In this study we are going to present results of global coherent infrasound measured at IMS infrasound stations and its correlation with atmospheric dynamics. A new implementation of the Progressive Multi-Channel Correlation (PMCC) algorithm enables characterization, with a single processing run, of coherent noise in log-spaced frequency with one-third octave bands from 0.01 to 5 Hz. Such a new array processing algorithm enables a better characterization of all received signals in their wave parameter space (e.g. frequency-azimuth space, frequency trace-velocity space). This, in turn, enables more accurate signal discrimination, and source and propagation studies. We are currently performing re-processing of the entire previous IMS infrasound database covering the time period from April 2005 to November 2018; whereas the number of stations has increased from 30 to 50. The obtained results clearly indicate a continuous spectrum of coherent signals at IMS stations within the 0.01 to 5.0 Hz frequency range; especially when comparing the recent results with those of previous re-processing approaches as well as the standard IDC products.