new bathymetric data (marion dufresne july 2008)
DESCRIPTION
New bathymetric data (Marion Dufresne July 2008). New bathymetric data (Marion Dufresne July 2008). New bathymetric data (Marion Dufresne July 2008). New bathymetric data (Marion Dufresne July 2008). Depth to basement map [MCS and OBS data] (Thiebot and Gutscher, 2006). - PowerPoint PPT PresentationTRANSCRIPT
New bathymetric data (Marion Dufresne July 2008)
New bathymetric data (Marion Dufresne July 2008)
New bathymetric data
(Marion Dufresne July 2008)
New bathymetric data
(Marion Dufresne July 2008)
Depth to basement map [MCS and OBS data] (Thiebot and Gutscher, 2006)
Sediment thickness map - W of Gibraltar
(Gutscher et al., accepted Tectonophys.)
Depth to Moho map (Gutscher et al., accepted Tectonophys.)
Crustal thickness map [S. Iberia - N. Morocco] (Gutscher et al., accepted Tectonophys.)
Extent of oceanic crust ?
Proposed OBS lines
Proposed OBS lines, SWIM bathymetry and MCS lines
Regional seismicity (PDE Catalog 1973-2008)
Seismicity (29 Aug 2007 - 31 July 2008) (recorded by land stations)
SWIM 2008 Cruise Report (L. Matias)
Seismicity (29 Aug 2007 - 31 July 2008) within 75 km of OBS-BB network
SWIM 2008 Cruise Report (L. Matias)
Proposed OBS lines
Proposed
OBS lines
P1: - too long / too many deployments, total 36 (thus compromising other lines)
[10 OBS in Tagus, 6 on and S of thrust belt, 3 overlap SISMAR OBS]
- very deep water (very long recovery time) Tagus 5000m, HAP 4800m, SAP 4200m
- little new info on crustal types (except perhaps Tagus)
- 50% of line has no seismicity, and is distant from OBS-BB network
Proposed
OBS lines
P2: - shortest distance between the SW Iberian (continental) margin and the NW
Moroccan (continental margin) crossing thin crust of uncertain type
- passes along existing high quality MCS profile (pre-stack depth migrated)
- crosses Marq. Pombal and the toe of the accretionary wedge (potentially seismogenic structures)
Free-air gravity anomaly (and SISMAR seismic profiles)
Kinematic reconstruction 195Ma (Sahabi et al., 2004)
Kinematic reconstruction 195Ma (Sahabi et al., 2004) w. magnetic anomalies (from Verhoef et al., 1991)
Magnetic anomaly maps
(Verhoef et al., 1991)
Magnetic anomaly maps
Iberian aero-mag map (left)
(Verhoef et al., 1991 - below)
Extent of oceanic crust ?