Lecturer: Dr. Natalia Poiata (National Institute for Earth Physics, Romania)

Date: December 6, 14:00-15:30

Place: Room 200, Research Center for Earthquake Prediction , Kyoto University Uji Campus

Title: Imaging seismic sources through an automated multi-scale detection and location scheme: application to the analysis of regular and slow earthquakes

Abstract:
The ability to outline in fine detail the pattern of seismic energy release at different spatial and temporal scales is crucial for understanding the physics of deformation processes. Recent rapid densification of seismological monitoring systems, and continuously growing computational resources provide an opportunity to explore seismic sources at previously unknown scales. This, however, requires automated methods that can fully exploit complexity of seismic signals recorded across dense, large-scale seismic networks.
In this talk I will present a recently developed method called BackTrackBB, which allows to image the coherent energy radiation from seismic sources associated to different tectonic environments using continuous seismic records (Poiata et al. 2016). The method is a computationally efficient, array-based scheme performing simultaneous detection and location of seismic sources by exploiting the multi-scale frequency-selective coherence of signals’ statistical features recorded across the stations of seismic network.
I will further discuss the performance of the method in detecting,Chile; (2) detection and location of tectonic tremor sources and low-frequency earthquakes during a tremor episode in southwestern Japan. The potential of extending the method to an automated system for seismic activity monitoring will be also presented.