Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 GEOLOGICAL APPLICATION OF SEISMOGRAPHY 1325 weathered layer. This is the refraction method applied on a miniature scale. If not accounted for separately in some such manner as this, it may easily introduce an error in depth determination of 100 feet or more. By taking this layer into account and also by determining elevations of shot and recorder points, the general, relative accuracy between two datums obtained by this method is found to be approximately per cent. In order to accomplis
Early geophysical papers of the Society of Exploration Geophysicists earlygeophysical00soci Year: 1947 GEOLOGICAL APPLICATION OF SEISMOGRAPHY 1325 weathered layer. This is the refraction method applied on a miniature scale. If not accounted for separately in some such manner as this, it may easily introduce an error in depth determination of 100 feet or more. By taking this layer into account and also by determining elevations of shot and recorder points, the general, relative accuracy between two datums obtained by this method is found to be approximately per cent. In order to accomplish this, all time measurements must be ac- curate to second. The determination of distance between shot and recorder points need not be very accurate. In most places several reflecting strata are present in the sub- surface, as shown in Figure 8. The recorder responds to each of these re- flections as it arrives. SHOT RECORDER Fig. 8.—Multiple reflections. 43
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