by BrianFrank » Aug 1, 2012 12:30 pm
This past Sunday night around midnight, a rock shelf supposedly collapsed in Pettyjohn's Cave unexpectedly. A group of cavers were on there way to the waterfall by the route of the Pancake Squeeze when it happened. I have been in contact with someone in this group for the details listed here.
I will be by there this Sunday to check it out and if anyone else goes by that area please let us know. The report is as follows:
The group went through the Pancake Squeeze and before they continued their journey to the waterfall, they were resting with their lights off sitting in the creek bed. The group then heard a crash and rumbling sound coming from the area they just exited from. The noise scarred them and they decided to end their trip and go back home. They went back carefully toward the Pancake Squeeze and found that the rock shelf you climb on to either go left to the Z-bends or go straight to the Pancake Squeeze had collapsed. Now, instead of climbing up over you must climb under the new obstruction to continue forward. You can see the fresh brake on the rock and how large the shelf was that broke. As far as the group knows there was no one else in the cave at that time.
I checked with the USGS Earthquake data for that time frame the only remotely possible tremor in the region was a 1.6 magnitude quake in Mississippi at 11:49 PM. That tremor was probably too small and too far away to be the cause. My opinion is that the weight of thousands of cavers over many years had fatigued the rock shelf to finally cause it to fracture.
Last edited by
BrianFrank on Aug 1, 2012 1:02 pm, edited 5 times in total.