Maps of linear synchronization for the properties of global low-frequency seismic noise
Category: 14-1
UDC 550.334
A.A. Lyubushin
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Moscow, Russia
Abstract
The global field of seismic noise with periods from 2 up to 500 minutes is considered. The investigation is based on the data recorded at broadband network IRIS (147 stations over the world) from the beginning of 1997 up to 31 March of 2012. The daily values of four seismic noise waveforms statistics are estimated for each station: logarithm of variance, multi-fractal singularity spectrum support width, linear predictability index and minimum normalized entropy of squared orthogonal wavelet coefficients. For each of these seismic noise parameters an averaged map of its distribution on the Earth's surface is plotted. Besides that the maps of linear synchronization are created which are defined within nodes of regular grid covering the Earth by values of multiple correlation of parameters for 5 seismic stations which are nearest to each node. Despite of the essential difference in spatial distribution of considered seismic noise parameters on the Earth's surface their linear synchronization maps turn to be rather similar each other. Three main centers of linear synchronization could be extracted: North America (including region of Yellowstone Caldera), South Europe and Mediterranean region, and Australia. The possible reasons for this phenomena are considered.
Keywords: global field of seismic noise, multi-fractals, wavelets, entropy, predictability, linear synchronization.
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