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- W216528596 abstract "Described herein are methods designed to obtain accurate broadband surface wave dispersion measurements on two spatial/frequency scales: continent-wide (Eurasia; 20 - 300 s) and regional (Central Asia, within 200 of KNET; 5 - 50 s). These methods are based on well developed frequency-time and floating-filter analyses, and are included within procedures that utilize relational parametric and waveform database structures with rapid graphics, which allow measurements to be made quickly on relatively large volumes of data from a variety of source regions recorded on heterogeneous networks. These methods are currently being applied systematically to GSN/CDSN/GEOSCOPE/MEDNET data and Kyrghyz Telemetered Seismic Network (KNET) data to yield Rayleigh and Love wave group velocity, phase velocity, polarization, and amplitude measurements. The complexity of Eurasian structure implies that the crucial problem is to extract the desired signals, related to nearly directly arriving waves that can be interpreted deterministically, from the essentially stochastic interfering multipaths and coda. Continent-wide, 200 events have been processed yielding dispersion measurements for more than 3000 paths to date (Levshin et al., 1995). Regionally, data from KNET's continuous channels have been accumulated for future analysis. All waveform (including 'cleaned' waveforms) and parametric data (including dispersion measurements and frequency-time images) are stored in CSS v. 3.0 (with appropriate extensions). In the near future, experiments will be performed to automate this method, which currently depends critically on human interaction. The resulting measurements and cleaned waveforms will be used as follows. (1) Group and phase velocity measurements are being inverted for 2D maps of group (Levshin et al., 1995) and phase velocities. (2) These maps will be inverted for lithospheric shear velocity structure which should provide significantly higher resolution than previous models, especially in Central Asia. (3) The cleaned waveforms are ideal targets for surface waveform fitting, which augments and complements the dispersion measurements. (4) Higher resolution phase velocity maps in Central Asia will be used to develop surface wave stacking/array processing methods for regional broadband arrays located in geologically complex settings, such as KNET. Such methods must incorporate differences in the dispersion characteristics among stations in the" @default.
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- W216528596 date "1995-08-14" @default.
- W216528596 modified "2023-09-27" @default.
- W216528596 title "MAKING ACCURATE CONTINENTAL BROADBAND SURFACE WAVE MEASUREMENTS" @default.
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