Reflection seismic imaging of the end-glacial Pärvie Fault system, northern Sweden

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• 作者：C. Juhlin ; M. Dehghannejad ; B. Lund ; A. Malehmir ; G. Pratt
• 关键词：Fault ; Wide-angle ; Velocity analysis ; Precambrian
• 刊名：Journal of Applied Geophysics
• 出版年：2010
• 出版时间：April 2010
• 年：2010
• 卷：70
• 期：4
• 页码：307-316
• 全文大小：4822 K

文摘

Reflection seismic data were acquired along a c. 23 km long profile over the Pärvie Fault system with a nominal receiver and source spacing of 20 m. An hydraulic breaking hammer was used as a source, generating signals with a penetration depth of about 5–6 km. Steeply dipping reflections from the end-glacial faults are observed, as well as sub-horizontal reflections. The location and orientation of the reflections from the faults agree well with surface geological observations of fault geometries. Reflections from a potential fourth end-glacial fault is observed further to the east along the profile. The more sub-horizontal reflections may originate from gabbroic bodies within the granitic basement or from deeper lying greenstones. Our results indicate that the end-glacial faults dip at moderate to steep dips down to at least 2–3 km depth, and possibly continue at this dip to depths of 6 km. This result has significant implications for determining the state of stress required to activate the faults in the past and in the future.