TY  - JOUR
ID  - epos1746
UR  - http://doi.org/10.1093/gji/ggw071
IS  - 3
A1  - Poiata, Natalia
A1  - Satriano, Claudio
A1  - Vilotte, Jean-Pierre
A1  - Bernard, Pascal
A1  - Obara, Kazushige
N2  - We present a new methodology for detection and space?time location of seismic sources based on multiscale, frequency-selective coherence of the wave field recorded by dense large-scale seismic networks and local antennas. The method is designed to enhance coherence of the signal statistical features across the array of sensors and consists of three steps: signal processing, space?time imaging, and detection and location. The first step provides, for each station, a simplified representation of seismic signal by extracting multiscale non-stationary statistical characteristics, through multiband higher-order statistics or envelopes. This signal processing scheme is designed to account for a priori unknown transients, potentially associated with a variety of sources (e.g. earthquakes, tremors), and to prepare data for a better performance in posterior steps. Following space?time imaging is carried through 3-D spatial mapping and summation of station-pair time-delay estimate functions. This step produces time-series of 3-D spatial images representing the likelihood that each pixel makes part of a source. Detection and location is performed in the final step by extracting the local maxima from the 3-D spatial images. We demonstrate the efficiency of the method in detecting and locating seismic sources associated with low signal-to-noise ratio on an example of the aftershock earthquake records from local stations of International Maule Aftershock Deployment in Central Chile. The performance and potential of the method to detect, locate and characterize the energy release associated with possibly mixed seismic radiation from earthquakes and low-frequency tectonic tremors is further tested on continuous data from southwestern Japan.
VL  - 205
TI  - Multiband array detection and location of seismic sources recorded by dense seismic networks
AV  - none
EP  - 1573
Y1  - 2016/02//
PB  - Oxford University Press
JF  - Geophysical Journal International
KW  - Time-series analysis Earthquake source observations Seismic monitoring and test-ban treaty verification Subduction zone processes
SN  - 0956-540X
SP  - 1548
ER  -