The sensitivity of seafloor compliance to two-dimensional low-velocity anomalies

Details The sensitivity of seafloor compliance to two-dimensional low-velocity anomalies The sensitivity of seafloor compliance to two-dimensional low-velocity anomalies

Nov 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.163..547h&link_type=abstract

Geophysical Journal International, Volume 163, Issue 2, pp. 547-558.

Statistics

Computation

3

Scientific paper

Seafloor compliance (the deformation of the seafloor under pressure forcing by long wavelength ocean surface waves) is a passive source geophysical measurement that is particularly sensitive to subsurface S-wave velocity. Existing inversions of seafloor compliance data for S-wave structure assume a 1-D velocity model, whereas in reality there may be significant lateral velocity variation. The effect of 2-D structure on compliance measurements has previously been investigated using finite differences, but computational constraints limit the number and type of models that can be tested. We present a quasi-analytical calculation of seafloor compliance over a cylinder that allows us to efficiently investigate the effect of an important subset of subsurface models, including pure fluid inclusions. The compliance displays the same sensitivity to regions of low shear modulus as is seen for 1-D situations, generating a strong peak over the low-velocity zone. The spatial width of this peak, which is a measure of the horizontal resolution of seafloor compliance, is approximately proportional to the depth of the cylinder, while its amplitude is controlled by the radius and depth of the cylinder and the S-wave speed of the cylinder and the background. Minimum structure 1-D inversions of the compliance measured above a fluid cylinder recover distinct low-velocity zones, although the recovered S-wave speed is much greater than zero, and the low-velocity zone is smeared out over a greater depth range than that occupied by the cylinder.

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