Abstract: The velocity of detonation of an explosive such as detonating cord (18, 22) is controlled by the addition of a diluent to the explosive, e.g., to the core of the detonating cord (18, 22). An explosively inert diluent, or a diluent comprised of an explosive of lower brisance than the principal explosive comprising the core of the detonating cord, will serve to reduce the velocity of detonation. Such reduced velocity of detonation has beneficial effects in certain operations, including cleaving rock (10), wherein it is observed to significantly reduce radial cracks (24) and stickers (26) (long radial cracks) in the vicinity of the boreholes (12) in which the low-velocity detonating cord (18, 22) is functioned to cleave the rock (10). The low-velocity detonating cord also facilitates leaving behind a smoother face in cutting trenches and tunnels through rock.

Abstract: A seismic explorative system for wilderness areas is described having a nonincendiary high core load linear detonating cord as the seismic energy source. The cord rests on the earth's surface in essentially an uncovered condition and comprises an elongated core of detonating explosive having a core load of about 100-400 grains per foot, an encircling layer consisting essentially of flame quenching particulate material adjacent the core along its entire length, a textile covering circumscribably confining both the core and the encircling layer and a fire retardant outer sheath protectively enclosing the textile covering.