Upper lithospheric structure in the central Fennoscandian shield: Constraints from P- and S-wave velocity models and Vp/Vs ratio distribution of the BALTIC wide-angle seismic profile

• Autorzy: Janik T.
• Języki publikacji: EN

Abstrakty

EN

The paper presents an analysis of the crust and upper mantle structure in the central Fennoscandian shield based on new P- and S-wave 2D velocity models of the BALTIC wide-angle reflection and refraction profiles. Using reprocessing of the old data, new P- and S-wave velocity models and V p /V s ratio distribution were developed. Moving from SW to NE, the thickness of the crust varies strongly, from ∼36 km to extremely thick, 58-64 km, crossing Wiborg rapakivi massif, Saimaa and Outokumpu areas, and Eastern Finland complex. Based on the lateral variations of V p , V p /V s and thickness of the crust, three main blocks of the crust and upper mantle were distinguished from SW to NE: southwestern, associated with Wiborg rapakivi massif; the central, having the highest thickness of the crust; and the northeastern, not well documented, with Archaean basement.

Słowa kluczowe

EN

Fennoscandian Shield; Baltic seismic profile; crustal structure; upper mantle; P- and S- wave 2D ray-tracing modelling; Vp /Vs ratio; crust-mantle boundary

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2010
• Tom: Vol. 58, no. 4
• Strony: 543--586
• Opis fizyczny: Bibliogr. 70 poz.

Twórcy

autor

Janik T.

• Institute of Geophysics, Polish Academy of Sciences, Warszawa, Poland,

Bibliografia

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