Improving Location/Detection Methods for Monitoring Research Using Large-Scale Correction Surfaces, Cross-Correlation Techniques and Genetic Algorithms

• Main Authors: Begnaud, Michael L, Rowe, Charlotte A, Steck, Lee K, Kim, Woohan
• Format: Report
• Language: English
• Subjects: ASIA; BEST FIT MODELS; CROSS CORRELATION; DATA BASES; DATA FUSION; DATA MANAGEMENT; GENETIC ALGORITHMS; HYPOCENTRAL PARAMETERS; RETROACTIVE CROSS-CORRELATION PICK ADJUSTMENT ALGORITHM; SEISMIC DATA; Seismology; SOFTWARE TOOLS; TRAVEL TIME CORRECTION SURFACES

The availability of seismic bulletin sources presents a problem when preparing data sets for studies. With so many choices, which catalog should be used? We have developed a method of merging data from all available seismic bulletins into a single database of non-redundant phases for each event. With this new database, additional ground truth (GT) events are readily identified due to the merging of all possible arrivals for each event. The compilation of over 8500 GT25 or better events in Asia allows the generation of large-scale travel time correction surfaces. We have created Pg, Pn, P, Sg/Lg, Sn, and S surfaces for the 1382 current and historic stations that detected a GT event. The availability of correction surfaces for any and all stations in a large region permit relocations that result in greater accuracy and increased event clustering for entire seismic catalogs. Proceedings of the 29th Monitoring Research Review: Ground-Based Nuclear Explosion Monitoring Technologies, 25-27 Sep 2007, Denver, CO sponsored by the National Nuclear Security Administration (NNSA) and the Air Force Research Laboratory (AFRL). The original document contains color images.