Special Aspects of Acquisition of 2D HRS Data Using Dynamite and Vibroseis Sources

. To obtain full fold data in urban zones with hard pavements, a new method for planting geophones has been developed and validated (clay-pots) . Furthermore IVI-minivibrators have been used for the first time at a large scale in Europe in the HRS frequency range . In this presentation these aspects of the acquisition, including processing in the field as part of the data quality control, will be discussed . Data Acquisition for a deep and shallow targe t Good quality seismic data can only be obtained by choosing optimum acquisition parameters with respect to the target zone . Important parameters are the source type (i .e. dynamite, vibroseis), the source depth and charge size in case of dynamite, the length of the sweep and the number of stacks in case of vibroseis and of course the source and geophone spacing . In this survey both a shallow and a deep target have been identified, making the optimum choice more tedious . Using a state-of-the-art data acquisition system (SUMMIT) however ensures a large dynamic range and optimum geometry quality control . The field crew enters channel locations and possible offsets from the planned positions directly in the field, which is written into the trace headers and stored on tape with the data . Detailed surveying incorporated a dual frequency DGPS geodetic network and accurate theodolite measurements of every station location .