In 1979 I rolled into Coco Beach, Florida as a new Air Force recruit. I would work at AFTAC which monitors nuclear events. I was assigned to TGS, the geophysical division, as a seismologist.
It was the end of one era and the beginning of another. We had access to interactive signal processing software that would have made Stephen Wolfram proud. Spectrums, cepstrums, convolution filters and so on. Unfortunately, we were constrained to the realm of statistics and statistical sigmas. From what I understand, we still are.