If we knew what caused it, it wouldn't be IDIOPATHIC! If and when a cause is found, it will have a (probably mechanistic) name, and will no longer be called idiopathic.
The Ebright Road benchmark (NGS disk EBRIGHT AZI) was found to be 447.85 feet above sea level. Many people consider Centreville, Delaware to be the highest point in the state; however, a benchmark at Centreville has an elevation of only 445.58 feet making the Ebright Azimuth disk more than two feet higher.
Beaumont: Beaumont Winter. Beaumont: beaumont highschool. Beaumont: The high peaks on the left are San Bernardino (10,649 ft.) and San Bernardino East (10,691). The highest mountain in Southern California (on the right) is San Gorgonio (11,499 ft.). Beaumont: Snowy day at Solaris.