CHIRP survey and Coring

During the Voltaire cruise more than 1260 km of CHIRP data have been acquired, for more than 149 hours. These data were used to survey the coring site VC-1 (actually sampled by the cores ST-1 and ST-2) and the potential coring site VC-2, both along the seismic line BS-07A (Fig. 13). Fig. 14 shows the location of all lines acquired. Fig. 15 and Fig. 16 show the location of the two coring sites in respect to bathymetry.

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Figure 13: line BS07A, acquired during the survey BIGSETS in 1998, showing the location of coring site VC-1 (VOL01) and the potential VC-2 (VOL02).

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Figure 14: overall of total CHIRP acquisition.

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Figure 15: location of the coring site VC-1 and bathymetry of the area.

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Figure 16: location of the coring site VC-2 and bathymetry of the area.

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Figure 17: location of coring site VC-1, stations 1 and 2 along the corresponding CHIRP profile.

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Figure 18: location of the potential coring site VC-2, along the corresponding CHIRP profile.

Some of the CHIRP lines provided also excellent images of different geological features:

1.

A mud volcano (Fig. 19).

2.

A possible gas pocket (Fig. 20).

3.

One active fault south of Albufeira (Fig. 21).

4.

Beautiful images of actual sea-bottom erosion at 54x vertical exaggeration (Fig. 22).

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Figure 19: example of mud volcanoes, recorded during CHIRP acquisition.

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Figure 20: example of possible gas pocket, recorded during CHIRP acquisition.

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Figure 21: the Albufeira fault, recorded during CHIRP acquisition.

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Figure 22: examples of sea-bottom erosion.