U.S. Geological Survey Crustal Studies Technical Letter Number 30
The lack of information on mantle velocities and crustal structure of the U.S.S.R. has led to a preliminary examination of published Soviet earthquake bulletins in the hope of deriving useful velocity and structure information from the data they contain. Mantle velocities deduced from earthquake data on several Russian earthquakes are in excellent agreement with results of Soviet deep seismic sounding.
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Rodriquez, R.G., 1965, Calculations of upper-mantle velocity from published Soviet earthquake data: U.S. Geological Survey Crustal Studies Technical Letter Number 30, 30 p. (Available at https://pubs.usgs.gov/misc/tl/0030/.)
Source of Data for Central Asican Earthquakes