OBS data from the Møre Margin. Trond Kvarven University of Bergen

Transcription

1 OBS data from the Møre Margin Trond Kvarven University of Bergen

2 Disposal Where is Møre Margin? Why Møre Margin? Acquisition Expected results Examples of seismograms Next steps

3 Møre Margin Kandilarov et al., 2009

4 Why. Module 5. University of Bergen. Ocean Bottom Seismic profile on the continental margin. Project leader: : Prof. Rolf Mjelde. From TopoScandiaDeep s homepage

5 Why. The Møre Margin comprises the Møre Basin and the Møre Marginal High and is located south of the more intensive geological and geophysical studied Vøring Margin. The landward Møre- topography is alpine dominated, whilst the landward topography of Vøring is not. The regional geology is dominated by km deep Cretaceous sedimentary basins which lies landward of the Marginal Highs. The tectonic development of the area is controlled by two structural trends; NE-SW (expressed by faults and basin axes ) and NW-SE (expressed by major fracture zones and lineaments). Profile 2 Profile 1 Profile 3 Modified from Blystad et al., 1995

6 Why. The Møre Margin comprises the Møre Basin and the Møre Marginal High and is located south of the more intensive geological and geophysical studied Vøring Margin. The landward Møre- topography is alpine dominated, whilst the landward topography of Vøring is not. The regional geology is dominated by km deep Cretaceous sedimentary basins which lies landward of the Marginal Highs. The tectonic development of the area is controlled by two structural trends; NE-SW (expressed by faults and basin axes ) and NW-SE (expressed by major fracture zones and lineaments). Profile 2 Profile 1 Profile 3 Modified from Blystad et al., 1995

7 Why. The Møre Margin comprises the Møre Basin and the Møre Marginal High and is located south of the more intensive geological and geophysical studied Vøring Margin. The landward Møre- topography is alpine dominated, whilst the landward topography of Vøring is not. The regional geology is dominated by km deep Cretaceous sedimentary basins which lies landward of the Marginal Highs. The tectonic development of the area is controlled by two structural trends; NE-SW (expressed by faults and basin axes ) and NW-SE (expressed by major fracture zones and lineaments). Profile 2 Profile 1 Profile 3 Modified from Blystad et al., 1995

8 Jan Mayen Fracture Zone Why. Jan Mayen Lineament? The Møre Margin comprises the Møre Basin and the Møre Marginal High and is located south of the more intensive geological and geophysical studied Vøring Margin. The landward Møre- topography is alpine dominated, whilst the landward topography of Vøring is not. The regional geology is dominated by km deep Cretaceous sedimentary basins which lies landward of the Marginal Highs. The tectonic development of the area is controlled by two structural trends; NE-SW (expressed by faults and basin axes ) and NW-SE (expressed by major fracture zones and lineaments). Profile 2 Profile 1 Profile 3 Møre Trøndelag Fault Complex Modified from Blystad et al., 1995

9 Acqusition The acquisition of the three crustal scale (OBS) profiles was performed during a cruise from May 24th to June 9th, Profile 1 and 2 were extended by land-stations stations. The survey was accompanied by gravity and magnetic measurements. The quality ranges from poor (< 40 km) to good (> 120 km). Mjelde & Minakov, 2009

10 Acquisition Seismic source: Four equal seized 1200 inch3 air-guns with a total volume of 4800 inch3. The shooting interval was approximately 200 meters. Lengt of the profiles: Profile 1: 281 km Profile 2: km Profile 3: km 1% of the data along the profiles was lost, 2.5% of the profiles was acquired with 2 air-guns, 33% with 3 air-guns, and 10% was acquired with low pressure. Strong breeze to gale prevailed during most of the survey. Gravity, magnetic and single-channel streamer data were acquired without problems along all profiles

11 Expected results Establish onshore-offshore offshore relationship (Profile 1 og 2). Gain more knowledge about the role of the inherited Precambrian grain (reflected in the fracture zones, lineaments, basin axes and a faults) in the Neogene uplift process. Achieve better mapping of the high velocity bodies included the Caledonian eclogites present within the lower crust off Norway. Elucidate if there is interplay between magma dynamics and inherited Precambrian structures.

12 Expected results Establish onshore-offshore offshore relationship (Profile 1 og 2). Gain more knowledge about the role of the inherited Precambrian grain (reflected in the fracture zones, lineaments, basin axes and a faults) in the Neogene uplift process. Achieve better mapping of the high velocity bodies included the Caledonian eclogites present within the lower crust off Norway. Elucidate if there is interplay between magma dynamics and inherited Precambrian structures.

13 Seismograms Profile 1

14 Seismograms Profile 1

15 Seismograms Profile 1

16 Seismograms Profile 1

17 Seismograms Profile 1

18 Seismograms Profile 1

19 Seismograms Profile 2

20 Seismograms Profile 2

21 Seismograms Profile 2

22 Seismograms Profile 2

23 Seismograms Profile 2

24 Seismograms Profile 3

25 Seismograms Profile 3

26 Seismograms Profile 3

27 Seismograms Profile 3

28 Next steps. During 2009 Further processing Modeling of Profile 3 During 2010 Modeling of Profile 1 and 2