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Refraction seismics across the Davie Ridge

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(1)

Refraction seismics across the Davie Ridge

Maren Baetzel Hannover, 14.11.2014

(2)

Reconstruction of Gondwana break-up

Koenig & Jokat, 2006

(3)

Characterisation of rifts and deeper structure of the crust along the Davie Ridge

Composition of the crust in the transitional area

Offshore propagation of the eastern branch of East African Rift System

Mougenot et al., 1986

Scientific Aim

(4)

Database

Cruise SO230 in January and February 2014

4 seismic refraction profiles

In total 90 OBS/OBH

Additional bathymetric,

gravimetric and magnetic data

(5)

Profile 130

150 140 131

20 OBS / OBH

Best data quality, data at all stations

Reflection seismic line starts between OBS 149 and 148

Prolongation of Davie Ridge

between OBS 139 and 141

(6)

Station 148

2,1 km/s

3,7km/s

4,5 km/s 2,4 km/s

(7)

Station 138

2,5 km/s 4,4 km/s 6,3 km/s

6,7 km/s

(8)

Comparision to reflection seismics

(9)

Velocity model

(10)

Raycoverage Refraction

(11)

Raycoverage Reflection

(12)

Further work / Open questions

Referenzen

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