A multi-channel approach for automatic microseismic event association using RANSAC-based Arrival Time Event Clustering (RATEC) |
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| Institution: | 1. School of Electrical and Computer Engineering (ECE) at Georgia Institute of Technology, USA;2. School of Earth and Atmospheric Sciences (EAS) at Georgia Institute of Technology, USA |
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| Abstract: | In the presence of background noise, arrival times picked from a surface microseismic data set usually include a number of false picks that can lead to uncertainty in location estimation. To eliminate false picks and improve the accuracy of location estimates, we develop an association algorithm termed RANSAC-based Arrival Time Event Clustering (RATEC) that clusters picked arrival times into event groups based on random sampling and fitting moveout curves that approximate hyperbolas. Arrival times far from the fitted hyperbolas are classified as false picks and removed from the data set prior to location estimation. Simulations of synthetic data for a 1-D linear array show that RATEC is robust under different noise conditions and generally applicable to various types of subsurface structures. By generalizing the underlying moveout model, RATEC is extended to the case of a 2-D surface monitoring array. The effectiveness of event location for the 2-D case is demonstrated using a data set collected by the 5200-element dense Long Beach array. The obtained results suggest that RATEC is effective in removing false picks and hence can be used for phase association before location estimates. |
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| Keywords: | RANSAC Phase association Passive seismic Sensor array Classification Multi-channel |
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