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- W2133752792 abstract "We have begun a major research effort consisting of a combination of seismic field deployments, historical seismic data retrieval, and seismic data analysis to further improve the calibration of northern Asia for nuclear explosion monitoring purposes. This project builds off previous work, and is a cooperative effort between Michigan State University (MSU), Los Alamos National Laboratory (LANL), Lawrence Livermore National Laboratory (LLNL), and several seismic networks in Russia and Japan. The geographic scope of this project covers Russia from the Urals to the Bering Strait and from the Arctic Ocean to the North Korean border. We are expanding our unique data set on earthquakes and nuclear and industrial explosions. Combining historic datasets with data from approximately 50 existing Russian and MSU/Russian and Japanese/Russian digital seismic stations, new deployments, and geologic information, we will substantially increase ground truth data and our understanding of the seismicity, velocity structure, explosion discrimination, and wave propagation characteristics in northern Asia. Our work will further improve location and detection and discrimination capabilities, crustal and upper mantle structure, wave propagation, and natural seismic source characteristics of northern Asia. Our initial work on this project covers several aspects. Updated our seismicity map and seismic database for eastern Russia through 2009. This update has added many thousands of events with associated bulletin information (phase arrival times, amplitude measurements, etc.). We are extending the map to cover the Altai-Sayan network. Targeted research on active faulting in the Nera Basin and the Moma Range by combining hypocenter locations, satellite and field analysis of fault scarps, and geomorphological analysis of geologic structures and river drainage. Continued our efforts to digitize and analyze historic seismograms from Soviet Peaceful Nuclear Explosions (PNEs) and analyze seismograms from more recent nuclear explosions in Asia. Made dispersion measurements for hundreds of paths and have used them to update group velocity maps of the region from 10 to 150 seconds period, which will be used to characterize the complex lithospheric structure of our study area. Re-examined mining explosion contamination present in eastern Russian seismic bulletins based on event time of day. We have improved the GT locations of the Yakutian PNEs, with most now classified as GT-1 or GT-0. Previously, actual errors for published locations were up to 40km." @default.
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- W2133752792 date "2010-09-01" @default.
- W2133752792 modified "2023-09-26" @default.
- W2133752792 title "SEISMIC AND GEOPHYSICAL CHARACTERIZATION OF NORTHERN ASIA" @default.
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