More recently southern California has been quite quiet in regards to major earthquakes. Was Landers the last major quake? Earthquake clustering, like for prime numbers, would seem most typical. So recurrence of quakes on a given fault, or fault ‘field’, or larger regional fault zone, would not seem uniform.
However have other possibilities been overlooked, such as stress reduction along faults, without our awareness? One has the historical Palmdale bulge probable vertical off loading relief of stress. Might one have a similar, but unbeknownst process, but underneath mountains? For example, did the Lander’s earthquake affect the height of nearby Mt San Jacinto?
So could one use lasers (Lidar) etc. to create a database of such mountain ranges’ height on an ongoing basis, to see if there is any unbeknownst releasing of stress for such earthquake prone region? Thus might such region be rheologically less quiet than it seems?