Computer Science
Scientific paper
Jan 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978e%26psl..37..451w&link_type=abstract
Earth and Planetary Science Letters, Volume 37, Issue 3, p. 451-464.
Computer Science
25
Scientific paper
A number of unreversed refraction profiles up to 40 km long and with closely spaced shots has been interpreted to provide the structure of oceanic Layer 2. Different velocity/depth models based on a homogeneous layered structure and on a gradient structure have been obtained for each profile. The gradient models are believed to be a better representation of the real earth. They are all remarkably similar with a predominant velocity gradient of 0.85-1.35 km s-1 km-1 ending with a slowly downward increasing velocity of about 6 km s-1 at about 2 km depth. The positive gradient can be reasonably explained by the reduction downwards of bulk porosity, particularly due to the closure of cracks, in a simple two-component, basalt plus voids, model. The model takes account of weathering but not of metamorphism. A theory, based on oversimplified assumptions about the rocks in Layer 2, allows rough estimates of porosity at different depths to be made.
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