.file extension SGA - SEG-A Seismic Data Format
File extension SGA description:
seismic data stored in the SEG Y format. SEG "Y" is a format devised by the Society of Exploration Geophysicists (SEG), for transfer of demultiplexed seismic data on 9-track tape. SEG Y was published in 1974, and superceded the SEG "Ex" format. SEG Y defines, for each tape reel, a 3200 byte EBCDIC text header, followed by a 400 byte binary header. The data follows as a variable number of traces. Each trace has a 240 byte header, followed by a variable number of samples, each represented as a 4-byte real value.