Hi. I am a retired earthquake seismologist who worked on various earthquake hazards topics with USGS for 40 years. I studied math as an undergrad and graduate student. Only began studying earth sciences once I started working with USGS. Initially, the push from funding agencies was to predict the size and time and location of future damaging earthquakes. However, this wish was never fulfilled. The physics of earthquakes is generally done in a classical framework. Only the most radical scientists tried to introduce techniques from quantum physics.