Accession Number : ADP204425

Title :   Constraints on the Upper Mantle Velocity Beneath the Yellow Sea, Eastern China,

Corporate Author : PHILLIPS LAB HANSCOM AFB MA

Personal Author(s) : Cipar, John J.

PDF Url : ADP204425

Report Date : 14 AUG 1995

Pagination or Media Count : 8

Abstract : Detailed models of the crust and upper mantle are crucial for precise event location and computation of realistic synthetic seismograms for earthquake/explosion identification. However, such models are not available for most of the globe, including eastern China. In this report, data from the 1992 Yellow Sea earthquake is used to put constraints on the upper mantle velocity beneath the Yellow Sea and eastern China. The average velocity in the upper mantle is measured at 8.06 km/sec. Comparison of observed waveforms to synthetics suggests that the upper mantle P-wave velocity gradient is 0.0013 km/sec/km, with a higher gradient in the uppermost mantle just beneath the Moho. Availability of array data for a suite of events could be used to place strong constraints on the velocity structure.

Descriptors :   *SEISMIC DETECTION, *EARTH CRUST, *SEISMIC WAVES, *ARMS CONTROL, *NUCLEAR EXPLOSION DETECTION, *SEISMIC DISCRIMINATION, *EARTHQUAKES, *EARTH MANTLE, VELOCITY, SYMPOSIA, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSION TESTING, SEISMIC DATA, WAVE PROPAGATION, TREATIES, SEISMIC VELOCITY, YELLOW SEA, ASIA, CHINA, PRIMARY WAVES(SEISMIC WAVES), MOHOROVICIC DISCONTINUITY, LITHOSPHERE.

Subject Categories : Government and Political Science
      Geology, Geochemistry and Mineralogy
      Seismology
      Seismic Detection and Detectors
      Nuclear Weapons

Distribution Statement : APPROVED FOR PUBLIC RELEASE