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GRACE. See movie Free air gravity anomalies derived from radar altimetric determinations of geoid height milligals.

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Presentation on theme: "GRACE. See movie Free air gravity anomalies derived from radar altimetric determinations of geoid height milligals."— Presentation transcript:

1 GRACE

2 See movie

3 Free air gravity anomalies derived from radar altimetric determinations of geoid height milligals

4 Bathymetry determined from satellite radar derived gravity plus shipboard measurements

5 Major types of isostatic compensation 1. Airy: crustal root compensates elevated topography a.Ocean-continent crustal thicknesses b.Majority of variations in elevations on continental mountain belts c.Oceanic plateaus 2. Thermal: elevated topography a result of thermal expansion a.Ocean ridge system b.Basin and Range 3. Flexural isostasy a.Bending of the lithosphere: oceanic trenches b.Regional isostasy

6 crust mantle Airy isostasy crustal thickening

7 crust mantle Airy isostasy topographic “load” compensating root Simple Airy isostasy is dealt with in more detail in grav_anom.ppt

8 crust mantle lithosphere mantle athenosphere 1300 C Temperature, degrees C 0 1300 50 100 150 200 Thermal isostasy A B Lithospheric thinning uplift from thermal expansion A B Thermal thinning and uplift are dealt with in more detail in thermal.pdf

9 Outstanding continental examples of thermal or Airy isostasy thermal Airy

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