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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-24 9:06 |
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Conference: Bucharest University Faculty of Physics 2008 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Slowness and azimuth determination for Bucovina array (BURAR) applying multiple signal techniques
Authors:
F. Borleanu(1), C. Neagoe(1), M. Popa(1), M. Radulian(1), J. Schwaitzer(2)
Affiliation:
(1) National Institute for Earth Physics, Bucharest-Magurele, Romania, felix@infp.ro
(2) NORSAR, P.O. Box 51, N-2027 Kjeller, Norway, johannes@norsar.no
E-mail
felix@infp.ro
Keywords:
slowness, azimuth, f-k analysis, BURAR array
Abstract:
Slowness and azimuth represent two important parameters currently used in array techniques to locate seismic events, blasts or nuclear explosions. BURAR, located in the northern Romania (Bucovina region), is a high-quality seismic array designed for monitoring events located in an area poorly covered by the existing seismic networks. In order to use BURAR array for single stations locations, it is crucial to calibrate as well as possible the azimuth and slowness parameters. The goal of this study is to investigate slowness and azimuth parameters in the case of regional events recorded by BURAR and to apply “f-k” and “bmfit” techniques in order to constrain these parameters. The analysis was carried out for regional earthquakes produced between 2004 and 2008 within 3000 km around BURAR site. We selected 130 events with sufficiently high signal-to-noise ratio and magnitudes greater than 3.
The results outline the domain of accuracy for evaluation of the slowness and azimuth parameters and how efficient are the two multiple-signal techniques that we applied. Depending on the signal-to-noise ratio for the P onset, one or other of these two techniques is more appropriate. Thus, when the P onset is less pronounced, the “f-k” analysis gives better results than “bmfit”, and vice versa.
Finally, we examine the efficiency of using BURAR as a single station in locating regional events for different well-defined seismogenic areas (eg., Anatolian fault, Aegean sea, Mediteraneean Sea).
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