ICONS atlas: AFR - Somali Basin

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Overview

This page bundles the available data for the Somali Basin in the Africa. The images are hyperlinks and will open up a separate window with a high resolution PDF image of the map.
The basin data is derived from a lower resolution grid which has been upsampled using GMT. This could have introduced an accuracy which is beyond the original data resolution.

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Somali Basin location map
Basin name Somali Basin
Region code AFR
Basin ID 7350
Plate location/code pasv divrg cont marg/PDC
Basin cross section

The basin cross section is automatically generated using the available crustal structure data sets. Sometimes the data labels are not plotted correctly, depending on the length of the section.

The location of the profile is indicated in all maps as dashed-dotted thin black line. For the endpoints of the profile, the two points of a given polygon located farthest away from each other were computed.

Somali Basin cross section
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Dynamic topography evolution for basin centroid
Somali Basin dynamic topography through time

The dynamic topography history for the basin is derived by tracking the basin centroid. The paleo-location for this point is computed using the EarthByte plate kinematic framework rotating the position back in time.

The dynamic topography model is derived from the S20RTS seismic tomography model (Ritsema et al., 99) by converting seismic velocites to density anomalies using an empirical scaling factor of 0.25. The density anomalies are then advected back in time to compute mantle flow with plate motions superimposed (using the EarthByte plate rotation framework) as surface boundary conditions. The dynamic topography is then derived from the computed density distribution using a free upper boundary. For details regarding the methodology see the following papers:

  • B. Steinberger, H. Schmeling, and G. Marquart. Large-scale lithospheric stress field and topography induced by global mantle circulation. Earth Planet. Sci. Lett., 186:75-91, 2001.
    doi: 10.1016/S0012-821X(01)00229-1.
  • B. Steinberger. Effects of latent heat release at phase boundaries on flow in the Earth's mantle, phase boundary topography and dynamic topography at the Earth's surface. Phys. Earth Planet. Int., 164:2-20, 2007.
    doi: 10.1016/j.pepi.2007.04.021.

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Observations

Mantle Lid thickness
Somali Basin location map
Statistics - Mantle Lid thickness
Median 80.089
Mean 80.824
Scale 4.319
stdev 5.081
Z_min/Location 54.763/8.66667°Lat 40.9°Lon
Z_max/Location 95.438/ 9.0°Lat 46.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Depth of 550 deg isotherm
Somali Basin location map
Statistics - Depth of 550 deg isotherm
Median -37.031
Mean -36.883
Scale 0.188
stdev 1.179
Z_min/Location -38.000/9.0°Lat 45.0°Lon
Z_max/Location -28.609/ 8.66667°Lat 40.9°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Mobil isopachs
Somali Basin location map
Statistics - Mobil isopachs
Median 2.822
Mean 3.132
Scale 2.208
stdev 2.065
Z_min/Location -0.309/1.9°Lat 42.8°Lon
Z_max/Location 7.613/ 4.86667°Lat 47.4°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Plain crustal thickness
Somali Basin location map
Statistics - Plain crustal thickness
Median 35.286
Mean 33.979
Scale 3.475
stdev 4.284
Z_min/Location 14.765/9.93333°Lat 45.0333°Lon
Z_max/Location 39.025/ 7.5°Lat 43.1667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base middle crust
Somali Basin location map
Statistics - Base middle crust
Median -26.026
Mean -25.330
Scale 3.311
stdev 3.578
Z_min/Location -29.972/6.1°Lat 47.7667°Lon
Z_max/Location -9.895/ 9.93333°Lat 45.0333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base lower crust
Somali Basin location map
Statistics - Base lower crust
Median -37.765
Mean -36.698
Scale 4.384
stdev 4.800
Z_min/Location -42.595/7.16667°Lat 44.0°Lon
Z_max/Location -14.420/ 9.93333°Lat 45.0333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Total crustal thickness
Somali Basin location map
Statistics - Total crustal thickness
Median 38.130
Mean 37.096
Scale 4.476
stdev 4.725
Z_min/Location 15.595/9.93333°Lat 45.0333°Lon
Z_max/Location 43.161/ 7.23333°Lat 43.9°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base upper crust
Somali Basin location map
Statistics - Base upper crust
Median -14.947
Mean -14.372
Scale 2.079
stdev 2.437
Z_min/Location -17.862/5.93333°Lat 47.9667°Lon
Z_max/Location -5.453/ 9.93333°Lat 45.0333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Thermal lithospheric thickness
Somali Basin location map
Statistics - Thermal lithospheric thickness
Median 118.602
Mean 117.920
Scale 1.080
stdev 4.017
Z_min/Location 87.080/8.66667°Lat 40.9°Lon
Z_max/Location 122.000/ 2.0°Lat 40.0°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Heatflow
Somali Basin location map
Statistics - Heatflow
Median 72.255
Mean 74.880
Scale 8.189
stdev 10.073
Z_min/Location 57.238/3.83333°Lat 47.9667°Lon
Z_max/Location 113.402/ 9.56667°Lat 43.1667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Topography (ETOPO2)
Somali Basin location map
Statistics - Topography (ETOPO2)
Median 410.000
Mean 482.721
Scale 360.272
stdev 464.246
Z_min/Location -3196.000/8.26667°Lat 50.9667°Lon
Z_max/Location 2465.000/ 7.53333°Lat 39.9667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Base hard sediments
Somali Basin location map
Statistics - Base hard sediments
Median -2.959
Mean -2.719
Scale 1.730
stdev 1.775
Z_min/Location -7.222/2.23333°Lat 46.1°Lon
Z_max/Location 2.050/ 7.93333°Lat 40.1333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Temperature at 50km depth
Somali Basin location map
Statistics - Temperature at 50km depth
Median 750.009
Mean 757.165
Scale 5.150
stdev 29.314
Z_min/Location 737.000/2.0°Lat 40.0°Lon
Z_max/Location 986.786/ 8.66667°Lat 40.9°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Laske sediment thickness
Somali Basin location map
Statistics - Laske sediment thickness
Median 3.410
Mean 3.242
Scale 2.404
stdev 1.862
Z_min/Location -0.018/7.16667°Lat 40.7°Lon
Z_max/Location 6.747/ 4.36667°Lat 43.0333°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Lithospheric temperature gradient
Somali Basin location map
Statistics - Lithospheric temperature gradient
Median 8.008
Mean 8.088
Scale 0.056
stdev 0.311
Z_min/Location 6.154/8.7°Lat 41.1°Lon
Z_max/Location 11.114/ 9.0°Lat 41.9667°Lon

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Computations

Isostatic correction
Somali Basin location map
Statistics - Isostatic correction
Median 1.360
Mean 1.263
Scale 0.865
stdev 0.686
Z_min/Location 0.000/7.4°Lat 40.7°Lon
Z_max/Location 2.456/4.36667°Lat 43.0333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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TTS (sediment)
Somali Basin location map
Statistics - TTS (sediment)
Median 1.457
Mean 1.456
Scale 1.184
stdev 1.245
Z_min/Location -2.136/7.5°Lat 39.9333°Lon
Z_max/Location 5.004/2.23333°Lat 46.1°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Beta (Sediment)
Somali Basin location map
Statistics - Beta (Sediment)
Median 1.229
Mean 1.281
Scale 0.227
stdev 0.276
Z_min/Location 0.785/7.5°Lat 39.9333°Lon
Z_max/Location 2.777/2.23333°Lat 46.1°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Crustal vs lithosph. extn.
Somali Basin location map
Statistics - Crustal vs lithosph. extn.
Median -0.119
Mean -0.061
Scale 0.078
stdev 0.160
Z_min/Location -0.372/8.66667°Lat 40.9°Lon
Z_max/Location 0.993/9.93333°Lat 45.0333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Anomalous TTS
Somali Basin location map
Statistics - Anomalous TTS
Median 2.440
Mean 2.058
Scale 1.271
stdev 1.639
Z_min/Location -4.722/9.93333°Lat 45.0333°Lon
Z_max/Location 4.609/5.66667°Lat 44.5667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Predicted elevation
Somali Basin location map
Statistics - Predicted elevation
Median 1412.770
Mean 1278.910
Scale 271.746
stdev 420.698
Z_min/Location -1120.530/9.93333°Lat 45.0333°Lon
Z_max/Location 1686.940/7.26667°Lat 43.6667°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Beta (Crust)
Somali Basin location map
Statistics - Beta (Crust)
Median 0.894
Mean 0.949
Scale 0.085
stdev 0.165
Z_min/Location 0.808/7.5°Lat 43.1667°Lon
Z_max/Location 2.137/9.93333°Lat 45.0333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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TTS (crust)
Somali Basin location map
Statistics - TTS (crust)
Median -0.926
Mean -0.602
Scale 0.861
stdev 1.062
Z_min/Location -1.853/7.5°Lat 43.1667°Lon
Z_max/Location 4.160/9.93333°Lat 45.0333°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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Differential Beta
Somali Basin location map
Statistics - Differential Beta
Median 0.350
Mean 0.332
Scale 0.246
stdev 0.312
Z_min/Location -1.204/9.93333°Lat 45.0333°Lon
Z_max/Location 1.382/2.23333°Lat 46.1°Lon

Comments

For explanation to the data source or computation of this grid please follow this link. Clicking the image will open a high-res PDF of the map. Units in the statistics table are same as map units. Z_min and Z_max refer to the minima and maxima with their respective geographic locations.

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This basin data is based on interpolated global grids and might contain gridding errors or wrongly interpolated data values.

Page generated 2008-08-03 02:36:30 CEST | © Christian Heine, School of Geosciences, Sydney University, Australia