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Quantitative Analysis of Velocity Inhomogeneities of the Pamirs-Hindu-Kush Upper Mantleстатья
- Авторы: Vinnik L.P., Lukk A.A., Mirzokurbonov M.
- Журнал: Izvestiya, Earth Physics
- Том: 14
- Номер: 5
- Год издания: 1978
- Первая страница: 319
- Последняя страница: 328
- Аннотация: A description is given of a graphical method of mapping a horizontal upper mantle velocity inhomogeneity, by projecting discrepancies in the travel times of waves from distant earthquakes to a given depth and smoothing the resulting numerical field. The differences in the velocity cross sections of neighboring mantle blocks are estimated by the magnitude of the discrepancies for rays intersecting the contact surface between blocks at various depths. A map of the horizontal velocity inhomogeneity of Pamir-Hindu-Kush is constructed. The intermediate-depth seismicity of the region is closely related to a high-velocity body detected at depths down to 300 km. The dimensions of this body and its relation to outcroppings of Precambrian rocks enable us to hypothesize that it represents the downward continuation of the edge of the old shield. The intermediate-depth seismicity is caused by the rigidity of the high-velocity body and by a concentration of tectonic stress in its narrowest part.
- Добавил в систему: Лукк Альберт Артурович