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  1. No Access

    Article

    Bathymetry of the Reykjanes Ridge

    We present a series of 1:200,000 scale maps of the bathymetry of the Reykjanes Ridge. The data are divided into four maps, extending 630 km along the ridge axis and between 30 and 100 km off-axis. This compila...

    J. A. Keeton, R. C. Searle, C. Peirce, B. Parsons… in Marine Geophysical Researches (1997)

  2. No Access

    Article

    Morphology and tectonics of the Romanche Transform and its environs

    We describe the results of GLORIA surveys of the Romanche Transform and neighbouring areas of the Equatorial Atlantic Ocean. These surveys have imaged the whole of the Romanche Transform Fault, the eastern end...

    R. C. Searle, M. V. Thomas, E. J. W. Jones in Marine Geophysical Researches (1994)

  3. No Access

    Article

    ALVIN investigation of an active propagating rift system, Galapagos 95.5° W

    ALVIN investigations have defined the fine-scale structural and volcanic patterns produced by active rift and spreading center propagation and failure near 95.5° W on the Galapagos spreading center. Behind the...

    R. N. Hey, J. M. Sinton, M. C. Kleinrock, R. N. Yonover… in Marine Geophysical Researches (1992)

  4. No Access

    Article

    Roller-bearing tectonic evolution of the Juan Fernandez microplate

    A combined GLORIA sidescan and Hydrosweep multi-narrow-beam sonar survey shows striking evidence for fan-shaped spreading systems, bounding pseudofaults and compression ridges associated with 90° of clockwise ...

    R. L. Larson, R. C. Searle, M. C. Kleinrock, H. Schouten, R. T. Bird, D. F. Naar… in Nature (1992)

  5. No Access

    Article

    GLORIA image processing: The state of the art

    This chapter presents a summary of the image-processing techniques being used at present in the Institute of Oceanographic Sciences Deacon Laboratory's GLORIA long-range sidescan sonar system. It begins with a...

    R. C. Searle, T. P. Le Bas, N. C. Mitchell, M. L. Somers… in Marine Geophysical Researches (1990)

  6. No Access

    Chapter

    GLORIA Image Processing: The State of the Art

    This chapter presents a summary of the image-processing techniques being used at present in the Institute of Oceanographic Sciences Deacon Laboratory’s GLORIA long-range sidescan sonar system. It begins with a...

    R. C. Searle, T. P. Le Bas, N. C. Mitchell… in Marine Geological Surveying and Sampling (1990)

  7. No Access

    Article

    Comprehensive sonar imaging of the Easter microplate

    Recent GLORIA and SeaMARC II sidescan sonar surveys have imaged virtually the whole of the Easter microplate, and revealed unprecedented detail and complexity in its tectonic fabric and history. There is clear...

    R. C. Searle, R. I. Rusby, J. Engeln, R. N. Hey, J. Zukin, P. M. Hunter… in Nature (1989)

  8. No Access

    Article

    Location and segmentation of the Cocos-Nazca spreading centre west of 95° W

    This paper describes GLORIA sidescan sonar data from a single swath along the Cocos-Nazca Spreading Centre between the 95.5° W propagating rift and the Pacific-Cocos-Nazca triple junction. Almost the whole of ...

    R. C. Searle in Marine Geophysical Researches (1989)

  9. No Access

    Article

    Morphology and tectonics of the Galapagos Triple Junction

    We describe the results of GLORIA and SEABEAM surveys, supplemented by other marine geophysical data, of the Galapagos Triple Junction where the Pacific, Cocos and Nazca plates meet. The data allowed detailed ...

    R. C. Searle, J. Francheteau in Marine Geophysical Researches (1986)

  10. No Access

    Article

    Magnetic anomalies in the northeast Atlantic Ocean (35°-50° N)

    A magnetic anomaly chart is presented of the Northeast Atlantic Ocean between 35° and 50° N. This chart is based upon measurements obtained during the period 1956–1984. In this paper a description is given of ...

    J. Verhoef, B. J. Collette, P. R. Miles, R. C. Searle… in Marine Geophysical Researches (1986)

  11. No Access

    Article

    Fanning of fracture zones and a three-dimensional model of the Mid-Atlantic Ridge

    Present-day spreading directions as represented by the active (transform fault) sections of fracture zones in the central North Atlantic do not fit a small circle pattern about a unique pole1–5, as recently confi...

    W. R. Roest, R. C. Searle, B. J. Collette in Nature (1984)

  12. No Access

    Article

    Oblique spreading and fracture zones

    R. C. SEARLE in Nature (1978)

  13. No Access

    Article

    A gravity survey of Ngorongoro Caldera, Tanzania

    A gravity survey of Ngorongoro Caldera is described. The volcano is associated with a negative Bouguer anomaly, which is thought to be due to low-density rocks forming the cone and to sediments deposited on th...

    R. C. Searle in Bulletin Volcanologique (1971)

  14. Article

    Evolution of Rifting in Africa

    R. W. GIRDLER, J. D. FAIRHEAD, R. C. SEARLE, W. T. C. SOWERBUTTS in Nature (1970)

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  15. No Access

    Article

    Lateral Extension in the East African Rift Valleys

    MCKENZIE et al.1 have proposed a pole position and rotation angle to describe the opening of the East African Rift Valleys. On the basis of this rotation, they expect extensions of about 30 km in Kenya and 65 km ...

    R. C. SEARLE in Nature (1970)

  16. No Access

    Article

    Evolution of Rifting in Africa

    Studies of seismicity, age of faulting, age of volcanoes and short and long wavelength gravity anomalies all indicate that the evolution of the East African rift system is related to attenuation and early stag...

    R. W. GIRDLER, J. D. FAIRHEAD, R. C. SEARLE, W. T. C. SOWERBUTTS in Nature (1969)