Integrated Seismic Event Detection and Location by Advanced Array Processing

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

Lawrence Livermore National Laboratory

关键词: Detection;    Approximations;    58 Geosciences;    Seismic Events;    Processing;   

DOI  :  10.2172/902233
RP-ID  :  UCRL-SR-228092
RP-ID  :  W-7405-ENG-48
RP-ID  :  902233

美国|英语

来源: UNT Digital Library

【 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.