地中地震計による探査について

Abstract

To study the velocity profile and the mechanical characteristics of the media consti-tuting the superficial layers, seismic explorations were carried out on the unsettled groundand observations in boreholes were employed.In ordinary prospecting, only the first arrivals are normally used and the propagationvelocity of the P waves is studied. Attempts are made in this paper to separate waveson the remainder of the trace and to develop the seismic prospecting methods based onthe use of transverse and converted waves.The, recordings are made with three component installations of seismographs fixed atthe bottom of the borehole. The explosions were detonated in the depth of in betweenOn and 55m from the mouth of the hole with 5n intervals.