It sounds like the east coast has been hit hard with snow this winter, then again with rain recently. That has made the ground very soft. It appears that there have been instances where trees have come uprooted because the ground is just saturated. Do you want to know how I know this is absolutely true?
I called my Grandma Saturday. She said she was in her bathroom that morning and heard a loud thump..She said she assumed it was her cat jumping around..
Do you see that short white pipe on her roof? The one that is about a foot or so tall? That is where her bathroom is....
Do you see this tree? It is a walnut tree. BIG. It has been there for many many years. As kids we used to crack the walnuts for hours and hours.
Back when my brothers and sister and I looked something like this..I have since acquired my front teeth and let the bangs grow and my brother beside me lost the hair he had. It was a long time ago.. back when my sister had blue eyes and blond hair and was super cute. Kinda like she still is. AND my little brother looks like he cant sit still long enough for a picture, kinda like he still is..
Anyway the ground was super wet and wind blew that walnut tree down. Right across this cave. Just feet away from the house...where my grandmother resides.