Abstract
The first-order crustal structure of the Magadan region and northeast Sakha Republic (Yakutia), northeast Russia, is obtained by simultaneously inverting for origin times and travel time curves. A total of 1210 observations are used. As an average, a 37-km-thick, 5.992±0.007 km/s crust overlying an 7.961±0.015 km/s mantle provides an excellent fit to phase data listed in the Materialy po Seismichnosti Sibiri bulletin. Travel time curves for individual stations are very close to this average, though there are variations in both crustal thickness and velocities; upper mantle velocities and crustal thickness appear to increase along the southern edge of the Okhotsk-Chukotka volcanic belt, and decrease in the upper Kolyma River basin and along the trace of the proposed Moma rift. Crustal thickness is greatest at Khandyga, on the Siberian platform, and lowest at Yubileniya, which may lie within the currently active Laptev Sea rift system.
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