Programmed multiple shot source system and method

Claim 1

A SEISMIC SURVEY SYSTEM FOR OBTAINING AND RECORDING DATA REPRESENTING FORMATIONS AT DIFFERENT DEPTHS, COMPRISING: (A) GEOPHONE MEANS; (B) PLURAL AMPLIFIER CHANNELS CONNECTED TO SAID GEOPHONE MEANS AND INCLUDING TUNED FILTER MEANS ADJUSTED RESPECTIVELY TO PASS A BAND OF LOWER FREQUENCIES THROUGH ONE CHANNEL AND A BAND OF HIGHER FREQUENCIES THROUGH A DIFFERENT CHANNEL; (C) A FIRST SEISMIC SOURCE OPERATIVE WHEN ACTUATED TO GENERATE SEISMIC DISTURBANCES AT FREQUENCIES WITHIN SAID LOWER PASS BAND; (D) A SECOND SEISMIC SOURCE OPERATIVE WHEN ACTUATED TO GENERATE SEISMIC DISTURBANCES AT FREQUENCIES WITHIN SAID HIGHER PASS BAND; (E) SEISMIC-REFLECTION RECORDER MEANS CONNECTED WITH SAID CHANNELS TO RECORD THE FREQUENCIES PASSING THERETHROUGH; AND (F) SEQUENCER MEANS OPERATIVE TO ESTABLISH A CONTINUOUS CYCLE OF OPERATION BY THE TIME-INTERLACED ACTUATION OF THE FIRST AND SECOND SEISMIC SOURCES ACCORDING TO A PROGRAMMED SEQUENCE, AND INCLUDING MEANS FOR ACTUATION OF SAID RECORDER MEANS TO SEPARATELY RECORD REFLECTION SIGNALS CORRESPONDING WITH THE PARTICULAR FREQUENCY COMPONENTS WITHIN THE PASS BANDS OF SAID PLURAL CHANNELS.