LAMONT-DOHERTY GEOLOGICAL OBSERVATORY PALISADES NY
Some of the results of a number of projects are summarized An approximate method for calculating the reflection and transmission coefficients of obliquely incident Rayleigh waves across two welded quarter-spaces is outlined Group velocities of fundamental mode Rayleigh and Love waves, with paths traversing the Tibetan Plateau, were used to determine that the Tibetan Plateau has a 70 km thick crust, with a low velocity zone at an intermediate level within the crust A zone of large, negative residuals for P-wave arrivals exists in northern New York State. Surface-wave amplitude spectra constrained by body-wave first motions are sufficient to determine focal mechanisms for some moderate-sized earthquakes along the Mid-Atlantic ridge Microseismicity and geological evidences were used to model the current tectonic processes of the Hazara district in northern Pakistan The historical and modern seismicity of a portion of south-central Asia was compiled and critically reviewed to delineate large-scale seismotectonic trends and Seismic, volcanic, and plate tectonic data indicate the Makran region of southern Pakistan is an active subduction zone.
Final rept. 1 Oct 1976-30 Sep 1978
Sponsored in part by DARPA. DOI: 10.21236/ADA067835