But “we were a little surprised when we heard where the fault line was. The USGS (U.S. Geological Survey ... it as “active,” Thompson said. Blind-thrust faults, which fracture deep in ...

Over recent geologic time, as the lunar interior cooled and contracted the entire moon shrank by about 100 m. As a result, its brittle crust ruptured and thrust faults (compression) formed ...

a professor of geology at the University of California at Davis. Known as “blind” thrust faults because they can’t be seen at ...