Fault three-dimensional digital detection method

The invention discloses a fault three-dimensional digital detection method, which comprises the following steps of: establishing an earthquake advanced observation model by using a DMIS technology, acquiring and processing earthquake data, starting to carry out a fault detection experiment by using a detection instrument, emitting a color light source to the surface of a fault by using a PET colorimage technology, taking the initial contour area corresponding to the minimum difference value as a contour area forming the section on a PET emission image, and locking the orientation of the section. Compared with a traditional section positioning method, the method has the advantages that chroma coding can be carried out on faults of different structures by the aid of PET technologies, accordingly, the faults can be marked and can be compared with preset thresholds, the positions of different faults and the structural contours of the faults can be known more accurately, the positions of the faults can be observed