Can Anyone Please Explain Me The Dynamite As The Energy Source For Reflection Shooting On The Land?

By exploding the dynamite energy is released; because of the impulsive nature of the seismic signal it creates and the convenient storage and mobility it provides for energy that can be converted into ground motion, dynamite should constitute an ideal seismic source from any points of view. There are, however, a number of drawbacks to its use:
1. in seismic operations, the dynamite is planted in sticks or cans in the boreholes (usually about four inches in diameter) that may range from 30 ft to several hundred feet in depth; this requires drilling the holes, which is difficult and expensive in many areas, particularly in hilly terrain into which heavy drilling equipment can not easily moved or in desert areas where water is not readily available.

2. dynamite can be dangerous; although the safety record of the geophysical industry has been remarkably good, the hazard involved in using dynamite has led to legal restrictions, some reasonable and others perhaps not, upon its transportation, storage and handling, which often cause considerable cardboard-covered sticks 20 in long with a diameter of about 3 inches, and a weight of 5 lb. the dynamite itself is implanted in a matrix of inert materials so that it constitutes only about sixty percent of the weight of  the sticks themselves.