NDLI: The Influence of Path Corrections and a Three-dimensional Global P-wave Velocity Model on Seismic Event Location in Kazakhstan

Content Provider	Springer Nature Link
Author	Hartog, Renate Spakman, Wim Thurber, Clifford H. Trabant, Chad
Copyright Year	2003
Abstract	We relocate 81 large nuclear explosions that were detonated at the Balapan and Degelen Mountain subregions of the Semipalatinsk test site in Kazakhstan during the years 1978 to 1989. The absolute locations of these explosions are available, as well as very accurate estimates of their origin times. This ground truth information allows us to perform a detailed analysis of location capability. We use a sparse network of stations with highly accurate first arrival picks measured using a waveform cross-correlation method. These high quality data facilitate very accurate location estimates with only a few phases per event. We contrast two different approaches: 1) a calibration-based approach, where we achieve improved locations by using path corrections, and 2) a model-based approach, where we achieve improved locations by relocating in a recently published global 3-D P-velocity model. Both methods result in large improvements in accuracy of the obtained absolute locations, compared to locations obtained in a 1-D reference earth model (ak135). The calibration-based approach gives superior results for this test site, in particular when arrival times from regional stations are included. Estimated locations remain well within a 1000 km2 region surrounding the ground truth locations when the path corrections for the Balapan and Degelen Mountain subregions are interchanged, but even for the short separation between these two regions, we find variations in the path corrections that cause systematic mislocations. The model-based approach also results in substantially reduced mislocation distances and has the distinct advantage that it is, in principle, transportable to other source regions around the world.
Starting Page	2239
Ending Page	2255
Page Count	17
File Format	PDF
ISSN	00334553
Journal	Pure and applied geophysics
Volume Number	160
Issue Number	12
e-ISSN	14209136
Language	English
Publisher	Birkhäuser-Verlag
Publisher Date	2003-01-01
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nuclear explosions seismic location corrections P waves ground truth
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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