Abstract: A device for interlocking in elastic fashion two coaxial rotating pieces, respectively interior and exterior, having a cylindrical interface, comprises split pins which are introduced into seatings formed parallel to the rotation axis at the interface of the two pieces. The pins are hollow steel cylinders split in the longitudinal direction, each pin being free to rotate in its seating and containing a cylindrical shank threaded in the pin with a predetermined clearance to impose a limit value chosen having regard to the reduction of the width of the split of the pin under the effect of an excessive couple.

Abstract: An apparatus and method for improving seismic resolution involving the application of scaling factors to seismic data which compensate for amplitude decay as a function of time, frequency and source-to-receiver distance (position). Each seismic trace associated with a common source-to-receiver distance is first separated into a plurality of frequency band-limited component traces. A time-variant amplitude scale factor (or its equivalent) is generated for each component trace. These scale factors are then applied to the component trace thus compensating for amplitude decay of the component trace. Upon recombination of the component traces a multidimensional amplitude scaled (MIDAS) seismic trace is recovered. The apparatus and method are particularly useful in creating a high-frequency extension of the frequency bandwidth resulting in improved resolution upon further processing or display. The method can be implemented as part of the field procedure or during subsequent computer processing.