Evaluation of Thb Lasa. Alpa. Norsar Long Period Network
نویسنده
چکیده
This report is an expansion of SAAC Report No. 4. The SAAC long period processing methods, based on frequency-wavenumber analysis, are capable of analyzing all the events reported in the LASA and NORSAR Daily Event Sununaries within real-time. The capability of LASA to detect Rayleigh waves is azimuth dependent. A comparison of NORSAR and LASA on a data set of Kurile islands events resulted in a detection of surface waves from all events with m^ 4.0 as reported by the LASA Daily Event Summary. A study of central Asia-western Soviet Union events shows that NORSAR M values are consistently higher than those at ALPA or LASA, the lowest level detections being made were on events with Ms = 2.5 and 2.7 for the western Soviet Union and central Asia respectively.
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