Anisotropic velocity models for (3D) seismic imaging ofthe Lower Seve Nappe in Jämtland, Sweden.

Kästner, Felix, Klaeschen, Dirk , Berndt, Christian , Pierdominici, Simona and Hedin, Peter (2022) Anisotropic velocity models for (3D) seismic imaging ofthe Lower Seve Nappe in Jämtland, Sweden. Open Access Geophysical Journal International, 228 (1). pp. 66-77. DOI 10.1093/gji/ggab339.

[thumbnail of ggab339(1).pdf]
Preview
Text
ggab339(1).pdf - Published Version
Available under License Creative Commons: Attribution 4.0.

Download (8MB) | Preview

Supplementary data:

Abstract

Strong anisotropy of seismic velocity in the Earth’scrust poses serious challenges for seismic imaging. Where in situ seismic properties are not available the anisotropy can be determined from velocity analysis of surface and borehole seismic profiles. This is well established for dense, long-offset reflection seismic data. However, it is unknown how applicable this approach is for sparse seismic reflection data with low fold and short offsets in anisotropic metamorphic rocks. Here we show that anisotropy parameters can be determined from a sparse 3D data set at the COSC-1 borehole site in the Swedish Caledonides and that the results agree well with the seismic anisotropy parameters determined from seismic laboratory measurements on core samples. Applying these anisotropy parameters during 3D seismic imaging improves the seismic image of the high amplitude reflections especially in the vicinity of the lower part of the borehole. Strong reflections in the resulting seismic data show good correlation with the borehole-derived lithology. Our results aid the interpretation and extrapolation of the seismic stratigraphy of the Lower Seve Nappe in Jämtland and other parts in the Caledonides.

Document Type: Article
Funder compliance: DFG: 339380967
Keywords: seismic anisotropy, crustal imaging, high pressure metamorphism
Research affiliation: HGF-GFZ
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-GDY Marine Geodynamics
Main POF Topic: PT8: Georesources
Refereed: Yes
Open Access Journal?: No
Publisher: Oxford Univ. Press
Projects: SPP 1006, COSC-1
Date Deposited: 12 Aug 2021 12:38
Last Modified: 07 Feb 2024 15:51
URI: https://oceanrep.geomar.de/id/eprint/53752

Actions (login required)

View Item View Item