45 2. Refraction surveying Refraction seismic surveying is widely used for near surface applications and can be carried out with light field equipment (Figure 2.6): • A seismic recorder (48 to 96 channels), • A set of sensors (geophones, hydrophones for marine surveys), • Cables or streamers, • Seismic sources (explosive, hammer, weight drop…). a b c d e f g h Figure 2.6 Field equipment. Source: explosive, gun, weight drop (a, b, c: Apec document); sensors: vertical and horizontal geophones (d, e: IFPEN document), cables (f: IFPEN document); recorders: Geometrics Strataview (g: IFPEN document), Geometrics geode (h: GEO2X document).
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