Figure 1.  SRTM-30 bathymetry and topography on the SE Indian Ocean.



Indicate where you would get the following (put the number on the map) and why:

1.                Thickest sediment:

2.                Thin sediment (reason 1):

3.                Thin sediment (reason 2):

4.                Siliceous ooze:

5.                Calcareous ooze:

6.                Abyssal/red clay:

7.                Terrigenous gravel:



Figure 2.  Part of orbit 117 for Topex cycle 365.

Is there a major plate tectonic feature on this profile?  If so, what is it, and in any case, why do you say this?  Does the pattern in the bathymetry between latitudes 31 and 38 tell you anything about the geologic history?


 

Figure 3.  Part of orbit 165 for Topex cycle 364.

Two quite different major features on the seafloor show up on both the geoid anomaly and the bathymetry.  Where are they, and what do you think they are?

 

What is the regional, long wavelength trend in the geoid here, and what probably causes it?



Maps showing locations of the altimeter profiles

 

 

Figure 2.  Part of orbit 117 for Topex cycle 365. Note that in addition to going over the ridge, the profile crosses a number of fracture zones.  The crust is different ages on each side of the fracture zone, and thus different depths.

 

Figure 3.  Part of orbit 165 for Topex cycle 364.  Note the profile crosses a ridges at around S42, and a number of fracture zones, and a large seamount around S34.