Integrated Seismic Event Detection and Location by Advanced Array Processing

Kvaerna, T ; Gibbons, S J ; Ringdal, F ; Harris, D B

关键词: ACCURACY;    APPROXIMATIONS;    DETECTION;    PROCESSING;    SEISMIC EVENTS;   

DOI  :  10.2172/902233
RP-ID  :  UCRL-SR-228092
PID  :  OSTI ID: 902233
Others  :  TRN: US200717%%498

学科分类：地球科学(综合)

美国|英语

来源: SciTech Connect

【 摘 要 】

The principal objective of this two-year study is to develop and test a new advanced, automatic approach to seismic detection/location using array processing. We address a strategy to obtain significantly improved precision in the location of low-magnitude events compared with current fully-automatic approaches, combined with a low false alarm rate. We have developed and evaluated a prototype automatic system which uses as a basis regional array processing with fixed, carefully calibrated, site-specific parameters in conjuction with improved automatic phase onset time estimation. We have in parallel developed tools for Matched Field Processing for optimized detection and source-region identification of seismic signals. This narrow-band procedure aims to mitigate some of the causes of difficulty encountered using the standard array processing system, specifically complicated source-time histories of seismic events and shortcomings in the plane-wave approximation for seismic phase arrivals at regional arrays.