| 摘要 |
Initiation, in sequence, of pulses of seismic energy from a selected depth within a shothole using elongated charges of explosive gas mixtures, is provided by a seismic source system including novel digital data responsive control circuitry controlling the initiation and duration of gas delivery as well as ignition of the gas in accordance with control signals generated using, as a source code, clock pulses and digital signals representative of multi-bit timing words, such as, for example, a nine- or 21-bit digital word.
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