Regional and semi-regional modelling of wide-angle shear waves in OBS data from the Vøring Basin, N. Norway-a comparison

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概要

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• Shear wave refractions and wide-angle reflections recorded on densely spaced Ocean Bottom Seismometers (OBSs) in the Vøring have been modelled by use of 2-D kinematic ray-tracing. Twenty-five three component OBSs were deployed along a 120 km long profile, and the semi-regional shear-wave velocity model derived from modelling the horizontal components is compared with a regional model from 5 OBSs along the same profile. The overall shear-wave velocity distribution of the two models are fairly similar, proving that the regional procedure with large OBS spacing provides a reliable regional shear-wave velocity model. The semi-regional model is more detailed than the regional model due to the much closer receiver spacing. The vertical resolution is improved, especially in the shallow sediments, and this enables a more detailed lithological interpretation to be carried out. Intermediate and deep sediments are also better resolved in the semi-regional model, indicating both vertical and lateral changes in the lithology. The V<SUB>p</SUB>/V<SUB>s</SUB> ratio inferred for the crystalline basement is 1.75 in both models, considered to be typical for the continental crust. An increase in the V<SUB>p</SUB>/V<SUB>s</SUB> ratio in the lower crust is observed both in the regional and in the semi-regional model. This indicates a more mafic composition in the lower crust, supporting the interpretation that the lower crust is a "mixing" of continental crust and magmatic underplating.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Mjelde Rolf

  Institute Of Solid Earth Physics Univ. Of Bergen

• Kanazawa Toshihiko

  Earthquake Research Institute The University Of Tokyo

• Digranes Per

  Institute Of Solid Earth Physics Univ. Of Bergen

• Shimamura Hideki

  Institute For Seismology And Volcanology Hokkaido University

• Kodaira Shuichi

  Institute For Research On Earth Evolution Japan Agency For Marine-earth Science And Technology

• Digranes Per

  Institute of Solid Earth Physics, Univ. of Bergen, Allegt.

• Hiobara Hajime

  Earthquake Research Institute, Tokyo Univ.

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