I went out to the second grove at borrego palm canyon this weekend, it was pleasant. The moon was so bright I could make out words on my kindle. Water was flowing in the river, not to hot, not too windy.
As I was laying in my tent around 11pm I would guess, I heard and felt a loud boom that seemed to come from the earth. It lasted about 1 second, the ground rumbled and I heard a boom. I was thinking it could have been a little earthquake or a sonic boom. Pretty interesting!

