Abstract
Previous experiments to record seismic data at wide angle on the continental shelf have generally been unsuccessful in determining velocity structure in the lower crust; either the lines were too short or shot-receiver density too sparse to identify lower crustal arrivals. In contrast, deep normal incidence profiles show good structural resolution in the crust and uppermost mantle. A sea-bottom multichannel instrument has been developed to record datasets containing closely spaced traces, in order to improve the resolution of reversed wide-angle experiments on the continental shelf.
The Pull-up Multichannel Array (PUMA) is a 1200 m, 12-channel hydrophone array for remotely recording seismic data on the seabed. It consists of 12 short hydrophone sections linked by l00m-long passive sections. A pressure case is attached to the array at one end, in which recording electronics, cassette tape recorders and a battery power supply are housed. The PUMA is designed for deployment in water depths less than 200 m from a research ship and is moored to buoys for recovery.
The instrument, which was successfully used in an experiment west of Lewis, Outer Hebrides, UK (Powell and Sinha, 1987) was specifically designed to provide a reliable determination of the velocity structure of the crust and uppermost mantle over part of the BIRPS WINCH deep normal incidence profile. Because the traces are closely spaced it is easy to correlate phases across the record section and to monitor changes in amplitude. A velocity structure for the continental crust and uppermost mantle has been devised from these data, using amplitude modelling.
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References
Barton, P. J., Matthews, D., Hall, J., and Warner, M., 1984, Moho beneath the North Sea Compared on Normal Incidence and Wide-Angle Seismic Records, Nature (London) 308, 55–57.
Barton, P. J., and Wood, R., 1984, Tectonic Evolution of the North Sea Basin: Crustal Stretching and Subsidence, Geophys. J. R. Astron Soc. 79, 987–1022.
Bott, M. H. P., Armour, A. R., Himsworth, E. M., Murphy, T., and Wylie, G., 1979, An Explosion Seismology Investigation of the Continental Margin West of the Hebrides, Scotland, at 58° N, Tectonophysics 59, 217–231.
Brewer, J. A., Matthews, D. H., Warner, M. R., Hall, J., Smythe, D. K., and Whittington, R. J., 1983, BIRPS Deep Seismic Reflection Studies of the British Caledonides, Nature (London) 305, 206–210.
Calvert, A. J., 1985, Seismic Studies of the Atlantic Fracture Zones: Charlie-Gibbs and Tydeman, Unpublished PhD Thesis, University of Cambridge.
Červený, V., Molotkov, I. A., and Psencik, I., 1977, Ray Method in Seismology, Univ. Karlova, Praha, Czechoslovakia, 214 pp.
Diebold, J. B. and Stoffa, P. L., 1981, The Traveltime Equation, tau-p Mapping and Inversion of Common Midpoint Data, Geophysics 46, 238–254.
Duschenes, J., Potts, C. G., and Rayner, M., 1985, Cambridge Deep Ocean Geophone, Mar. Geophys. Res. 7, 455–466.
Fuchs, K. and Müller, G., 1971, Computation of Synthetic Seis-mograms with the Reflectivity Method and Comparison with Observations, Geophys. J. R. Astron. Soc. 23, 417–433.
Jones, E. J. W., White, R. S., Hughes, V. J., Matthews, D. H., and Clayton, B. R., 1984, Crustal Structure of the Continental Shelf off Northwest Britain from Two-Ship Seismic Experiments, Geophys. 49, 1605–1621.
Meissner, R., 1986, The Continental Crust: A Geophysical Approach. International Geophys. Series, 34, (W. L. Donn, ed.), Academic Press, London 423 pp.
Meissner, R., Luschen, E., and Fluh, E. R., 1983, Studies of the Continental Crust by Near-Vertical Reflection Methods: A Review, Phys. of the Earth and Planetary Interiors 31, 363–376.
Mooney, W. D. and Brocher, T. M., 1986, Coincident Seismic Reflection I Refraction Studies of the Continental Lithosphere: A Global Review, Presented at the Second International Symposium on Deep Seismic Reflection Profiles of the Continental Lithosphere 15–17 July 1986, Cambridge, England, 42 pp.
Mueller, S., 1977, A New Model of the Continental Crust, in The Earth’s Crust, Geophysical Monograph 20, American Geophysical Union, 289–317 (J. G. Heacock, ed.), Washington, DC.
Owen, T. R. E. and Mason, M., 1982, A Cassette Recorder for Explosion Seismology, Internal Report, Bullard Laboratories, University of Cambridge.
Phinney, R. A., 1978, Interpretation of Reflection Seismic Images of the Lower Continental Crust, EOS., Trans. AGU 59, 389.
Powell, C. M. R., 1986a, The PUMA Manual, Internal Report, Bullard Laboratories, University of Cambridge.
Powell, C. M. R., 1986b, A Wide-angle Multichannel Seismic Study of the Continental Lithosphere, Unpublished PhD Thesis, University of Cambridge.
Powell, C. M. R. and Sinha, M. C, 1987, The PUMA Experiment West of Lewis, UK, Geophys. J. R. Astr. Soc, 89, 259–264.
Powell, C. M. R., Sinha, M. C, Carter, P. W., and Leonard, J. R., 1986, A Sea-Bottom Multichannel Hydrophone Array, Mar. Geophys. Res. 8, 277–292.
Smith, W. A. and Christie, P. A. F., 1977, A Pull-Up Shallow Water Seismometer, Mar. Geophys. Res. 3, 235–250.
Stoffa, P. L., and Buhl, P., 1979, Two-Ship Multichannel Seismic Experiments for Deep Crustal Studies: Expanded Spread and Constant Offset Profiles, J. Geophys. Res. 84, 7645–7660.
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Roberts, C.M.R., Sinha, M.C. (1990). A Fixed Receiver for Recording Multichannel Wide-Angle Seismic Data on the Seabed. In: Hailwood, E.A., Kidd, R.B. (eds) Marine Geological Surveying and Sampling. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0615-0_5
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DOI: https://doi.org/10.1007/978-94-009-0615-0_5
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