In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 90, No. 4_Supplement ( 1991-10-01), p. 2275-2276
Abstract:
Acoustic–elastic wave propagation was simulated with a 2-D finite-difference method for models of an ocean layer, sediment layer, and rough basalt layer. The roughness profiles along the upper surface of the basalt, specified at 1- or 10-m intervals, are from a self-affine bathymetry model. A low-velocity sediment layer was included in some models as a pond or a blanket on the basalt. A bandlimited point source (maximum frequency 150–300 Hz) was initiated in the water within 150 m of the seafloor. Although the wave field in the water column scattered from the 1-m roughness is more complex than that from the 10-m roughness, the dominant features are similar. The 1-m roughness reduces the coda amplitude but increases its complexity and duration. The scattered field is dominated by diffractions from the larger irregularities along the irregular basalt interface. Sediment layers produce a long coda resulting from P–SV conversion and SV reverberation. SV energy trapped in sediment ponds persists for long travel times, becoming chaotic and contributing to the field observed in the water column.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1991
detail.hit.zdb_id:
1461063-2
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