This paper introduces a new type of all-solid-state land electric spark source which consists of four subseismic modules. Every module adopts the silicon control rectifier to replace the traditional gas switch

using the choke coil to limit the peak value and the rising-time of discharge current

using freewheeling diode to suppress reverse oscillating discharge current. By changing the discharge current waveform

the acoustic spectrum characteristics can be changed properly. The structure of electroacoustic transducer is a type of coaxial electrode which can produce the arc discharge. When the working voltage is 7 500 V

the storage of each module is 28 k J

and the total storage will be up to 112 k J. Four sub-seismic modules can discharge synchronously or asyn-chronously. The seismic section plots were obtained from the experiment in Hengshui of Hebei province. It shows that the seismic wave generated by the electric spark source can reach more than 2 000 m.