Geological evidence indicates that earthquakes of magnitude 6 to 7 were triggered by the two faults 2,000 and 4,000 years ago, which means that we are approaching the return period for another major quake. According to Assoc. Prof. Dr. Panya, the fact that there has been no such quake means that the faults are still building up their energy, and we cannot predict when this energy will be released.