Interface Wave Studies on the Ligurian Shelf Using an OBS Array: Experimental Results and Propagation Models

Snoek, Michael; Guidi, Guido; Michelozzi, Enzo

doi:10.1007/978-1-4613-2201-6_63

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Ali and Schmalfeldt [4]. Jensen and Schmidt [5]and Snoek [6] presented summaries ofthe workthat has been done in this eld. Many experiments have been conducted in water depths at which the sea oor is accessible by divers.…”

Section: Introductionmentioning

confidence: 99%

In Situ Measurements of Seafloor Shear-Wave Velocity and Attenuation Using Seismic Interface Waves

DALE BIBEE

2024

Acoustic Classification and Mapping of the Seabed 1993

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Section: Introductionmentioning

confidence: 99%

In Situ Measurements of Seafloor Shear-Wave Velocity and Attenuation Using Seismic Interface Waves

DALE BIBEE

2024

Acoustic Classification and Mapping of the Seabed 1993

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“…Very few in situ data exist on shear velocity and attenuation in the upper tens of meters of bottom sediment. Most shear velocity information has been derived from interpretation of low-frequency Stoneley/Scholte interface waves generated by explosions on or near the bottom with frequencies less than 100 Hz [Bucker et al, 1964;Davies, 1965;Essen, 1980;Rauch, 1980Rauch, , 1986Schirmer, 1980;Schmalfeldt, 1986;Snoek et al, 1986;Jensen and Schmidt, 1986;Sauter et al, 1986;Schreiner and Dorman, 1990]. These waves involve both compressional and shear energy, and amplitudes fall off exponentially with distance above and below the bottom.…”

Section: Introductionmentioning

confidence: 99%

Shallow water sediment properties derived from high‐frequency shear and interface waves

Ewing¹,

Carter²,

Sutton³

et al. 1992

J. Geophys. Res.

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Mthe scahed. stibhotton s elocit v/at tentation st ruectuLre is essential input bor predictive propation nmodels. To estiratec this structure. bottoin-mounted soutces and receivers %%ere used to make mecasuirments of shear ;and compressional wave ptopitgatioti in shallow water sedimnents of the continental shell'. usually where boreholes and high-resolution retlecuion profleks give substantial suipporting geologic infoaniation ;about the suhsuu1'ace. This colocation provides an opportunity ito comipate seismically determined estimates oft physical properties of' the seabed with the "gound truth-properties. Measuirenments were miade iti 1986 %kith source/detector otffsets up to 2(M) mn producing shear wave velocity versus depth proliles of, Ithe uippet ( So it) fiiii h seabed l;and P' wase proliles to lesser depths). Measuremients tn 1988 were made with smailer source devices designed to emphasiz.e higher f'requencies and recoirded by an array of 3(0 sensors spaced atf I-m intervals to imiprove spatial samnpling and resolution of s hallow structure. These investigations with shear waves have shown that significa~nt laiteraml and vertical variations in the physical properties of the shallow seabed are cotumion and tare principally created b.% erosional and depositional processes assoctated %%ith glacial cycles and sea level oscillations during the Quaternarv. When the seabed structure is relatively uniform over the length of the profiles. the shear wave fields aire well ordered, and the iuatching of the data with full waveform synthetics has been suceessl'ul. producing velocity/attenuation models consistent with the subsurface lithology indicated by coring results. Both body waves and LILow-frequency sound propagation in shallow water environments is not restricted to the water __ column but also involves the subbottom. Thus. as well as being important for geophysical description of the seabed. subbottom velocity/attenuation structure is essential input for predictive propagation models. To estimate this structure, bottom-mounted sources and receivers were used to make measurements of shear and compressional wave propagation in shallow water sediments of the continental shelf, usually where boreholes and high-resolution reflection profiles give substantial supporting geologic information about the subsurface. This colocation provides an opportunity to compare seismically determined estimates of physical properties of the seabed with the -'ground truth" properties. Measurements were made in 1986 with source/detector offsets up to 200 m producing shear wave velocity versus depth profiles of the upper 30-50 m of the seabed (and P wave profiles to lesser depths). Measurements in 1988 were made with smaller source devices designed to emphasize higher frequencies and recorded by an array of 30 sensors spaced at I-in intervals to improve spatial sampling and resolution of shallow structure. These investigations with shear waves have shown that significant lateral and vertical variations in the physical properties of the...

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Sediment Shear Waves: A Comparison of In Situ and Laboratory Measurements

Richardson¹,

Muzi²,

Troiano³

et al. 1991

Frontiers in Sedimentary Geology

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Interface Wave Studies on the Ligurian Shelf Using an OBS Array: Experimental Results and Propagation Models

Cited by 5 publications

References 3 publications

In Situ Measurements of Seafloor Shear-Wave Velocity and Attenuation Using Seismic Interface Waves

In Situ Measurements of Seafloor Shear-Wave Velocity and Attenuation Using Seismic Interface Waves

Shallow water sediment properties derived from high‐frequency shear and interface waves

Sediment Shear Waves: A Comparison of In Situ and Laboratory Measurements

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