منابع مشابه
Teleseismic P-Wave Tomogram of the Yellowstone Plume
[1] Inversion of a new data set of teleseismic P-wave travel-times from three PASSCAL seismic deployments around the Yellowstone hotspot reveals a 100 km diameter upper mantle plume that extends from the Yellowstone volcanic caldera to 500 km depth and dips 20 to the northwest. A monotonic decrease in the velocity perturbation of the plume from 3.2% at 100 km to 0.9% at 450 km is consistent wit...
متن کاملGlobal variation of body‐wave attenuation in the upper mantle from teleseismic P wave and S wave spectra
[1] We constrain the spatial variation of P‐wave (tP*) and S‐wave (tS*) attenuation by inverting 190,000 teleseismic P‐ and S‐wave spectra up to 0.8 Hz. These spectra are derived from 250 deep earthquakes recorded at 880 broadband global and regional network stations. The variance and ratios of tP* and tS* values are consistent with PREM’s upper mantle velocity and Q structures and conventional...
متن کاملUpper mantle Q and thermal structure beneath Tanzania, East Africa from teleseismic P wave spectra
[1] We measure P wave spectral amplitude ratios from deep-focus earthquakes recorded at broadband seismic stations of the Tanzania network to estimate regional variation of sublithospheric mantle attenuation beneath the Tanzania craton and the eastern branch of the East African Rift. One-dimensional profiles of QP adequately explain the systematic variation of P wave attenuation in the sublitho...
متن کاملUpper Mantle P-Wave Velocity Structure from Passcal Teleseismic Transects Across Idaho, Wyoming and Colorado
[1] Inversion of teleseismic P-time residuals along two linear seismic arrays provides well-resolved inverse images of the upper mantle. Low velocity bodies beneath the Yellowstone Hotspot Track and the Grand Mesa volcanic field in western Colorado are similar in shape and magnitude. In the two places where our transects cross the 1.78 Ga Archean-Proterozoic Cheyenne suture, high velocities are...
متن کاملA Wave Equation with Discontinuous Time Delay
The influence of certain discontinuous delays on the behavior of the solutions of the wave equation is studied.
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1970
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1970.tb06747.x