RESEARCH IN SEISMOLOGY
Annual rept., 1 Nov 1965-31 Oct 1966
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF GEOLOGY AND GEOPHYSICS
Pagination or Media Count:
The velocity structure in the earths mantle is determined using the travel times and travel-time slopes of P-waves recorded at LASA. The results show anomalous velocity gradients at depths of 700, 1200, and 1900 km. Both surface wave dispersion data and dtd delta data show the presence of lateral heterogeneities in the upper and lower mantle. Theoretical studies of acoustic and gravity wave propagation in the atmosphere-ocean systems, affected of aftershocks on free oscillations, and response of layered spherical earth to point sources have been described.