Hans Israelsson

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On May 25, 2009, the North Koreans conducted a second underground nuclear test in the same area as their initial 2006 test. Preliminary analysis indicated that the explosive yield of the second test was roughly 5 times that of the first, and it was found to have been well-recorded by a variety of globally distributed seismic networks. We carefully analyzed(More)
— The ability to retrieve forest stem volume using CARABAS (coherent all radio band sensing) SAR images (28–60 MHz) has been investigated. The test site is a deciduous mixed forest on the island of¨Oland in southern Sweden. The images have been radiometrically calibrated using an array of horizontal dipoles. The images exhibit a clear discrimination between(More)
SUMMARY Recently developed three-dimensional global seismic-velocity models have demonstrated location improvements through independent regional and teleseismic travel-time calibration. Concurrently, a large set of high quality ground truth (GT) events with location accuracies 10 km or better (GT0-GT10) has been collected for Europe, the Medite rranean,(More)
The objective of the Group 2 Consortium, which comprises the authors of this paper, is to improve seismic event locations and reduce bias and uncertainties in the Mediterranean, Middle East, North Africa and Western Eurasia by providing calibrated travel times for stations in the region. To achieve this goal we follow a model-based approach. High-quality(More)
Recently three-dimensional global seismic velocity models of crust and mantle have been developed and location improvements have been demonstrated with regional (CUB1 and CUB2 models) and teleseismic (J362 model) calibrations, respectively (Shapiro and Ritzwoller, 2002; Ritzwoller et al., 2002; Antolik et al., 2003). In this study, we validated event(More)
A three-year consortium project, with members of Science Applications was initiated in 2000 to improve locations and reduce uncertainties in the Middle East, North Africa, Europe, and Western Eurasia. The consortium developed high-resolution three-dimensional models of the Earth's mantle to generate accurate travel-time predictions for regional and(More)
We recommend a new set of regional Source Specific Station Corrections (SSSCs) be implemented in routine processing. The proposed Pn and Sn SSSCs are expected to improve locations in Europe, the Mediterranean, North Africa, Middle East, and Western Eurasia due to more accurate (calibrated) regional travel-times and reduced model errors. Dependencies and(More)
Subarray configuration is not a trivial problem in array signal processing. A proper subarray configuration is important to improve the detectability of an array. A new searching algorithm , which is based on Genetic Algorithms (GA), for the optimum subarray configuration is proposed in this paper. Our preliminary application to a seismic array has(More)
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