Reconnaissance seismic refraction surveys in the Malvern Hills Area

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Abstract
Seismic refraction profiles have been established in Eastnor Park (SO 745375) and in the Storridge area (SO 750486), respectively west and north of the Malvern Hills. The seismic results can be explained by a three‐layered subsurface configuration. Layers 1 and 2 are roughly equivalent to Silurian and Cambrian strata and layer 3 is regarded as Precambrian basement.Under both profiles the Cambrian is much thinner than at the southern end of the Hill range where Groom (1902) estimated a minimum thickness of 2,500 ft (762 m). In Eastnor Park the basement dips westwards at about 10° and is overlain by approximately 1,000 ft (305 m) of Cambrian strata. At the western boundary of the Malvern Hills the Cambrian appears to be cut out locally by a pre‐LIandovery fault.In the Storridge area the seismic results are consistent with a shallow basement overlain by a few hundred feet of Cambrian strata, as suggested in an earlier paper on the basis of gravity and magnetic interpretations (Brooks 1968).