A refraction profile in the Caledonian Front of the Tåsjön area, north central Sweden
作者:
Carl-Erik Lund,
期刊:
Geologiska Föreningen i Stockholm Förhandlingar
(Taylor Available online 1980)
卷期:
Volume 101,
issue 4
页码: 245-254
ISSN:0016-786X
年代: 1980
DOI:10.1080/11035898009450842
出版商: Taylor & Francis Group
关键词: Seismic surveys;refraction;profiles;P-waves;S-waves;velocity structure;travel-time curves;crust;thicknesses;basement;sedimentary cover;decollement;Caledonian Front;Tåsjön;northern Jämtland;northwestern Ångermanland;north central Sweden
数据来源: Taylor
摘要:
A seismic refraction profile about 34 km long was investigated in the Tåsjön area of north central Sweden. The profile was orientated nearly perpendicular to the Caledonian Front. Very clear first arrivals were recorded from the sedimentary layers, as well as from the underlying granitic basement. From some of the shot points, transverse waves were recorded, as well as surface waves. The interpretation has been made, using travel-time analysis of the firstP-wave arrivals, as well asS-wave arrivals. Relatively high velocities, 4.4–5.4 km/s were recorded from the sedimentary cover. A normal upper-crust velocity, about 6.0 km/s, was recorded from the basement. The thickness of the sedimentary cover increases from about 0.34 km in the eastern part of the profile to about 1.3 km in the western part of the profile. The granitic basement rises from 0.94 km below sea level in the western part of the Caledonian Front to 0.09 km below sea level in the central part of the Front.
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