Some friends were actually on the mountain at the time and saw a crack open up at least 18 inches wide.
They were stuck up there for several hours until the authorities deemed it save to drive down the mountain without rocks falling.
“The Twenty Nine Palms/Big Bear shaker in the mid-nineties got my attention also.”
I remember that one. Shook hard enough to be felt in Orange County. Sure wouldn’t have liked being up on the mountain like your friends.