Abstract
Seismic refraction measurements along three profiles with lengths ranging from 160 km to 270 km were made in 1976 and 1978 as part of a multinational effort to study the Earth's crust and upper mantle in the Svalbard region. The crustal tliickness is about 26 km along the west coast of Spitsbergen, and faulting and a strong eastwardly dip of the Moho increase the; crustal thickness to 40 km beneath the Tertiary Fold Belt on West Spitsbergen. Further to the east, P n arrivals indicate a transitional nature of the Moho in the area beneath the Central Spitsbergen Basin. Evidence suggests the presence of major N-S trending faults dividing the Spitsbergen crust into blocks. A down-faulted sedimentary basin, containing about 3 km of sediments and presumably of Cenozoic age is observed in the Forlandsundet area. The maximum thickness of the Cenozoic and Mesozoic rock sequences on Central Spitsbergen is estimated to be about 5 km.
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