A note of caution: ObsPy is designed for earthquake seismology (passive source), not active source exploration (airguns/vibroseis). However, if you are working with passive seismic or microseismic monitoring, ObsPy is the best free tool for filtering, instrument response removal, and array processing.
For the motivated geoscientist, however, this is a golden age. Download Madagascar, load a SEG-Y file, and start seeing the Earth. The only thing stopping you is your willingness to learn. free seismic data processing software