considering it is WV, there is some likelihood that it is due to mine subsidence. Sometimes when a mine is exhausted, people illegally remove support columns of coal or whatever…. sometimes the mines are so old that people just did whatever, and there are so many old mines that are poorly mapped out in some parts of wv/pa that peoples homes regularly sink into the ground. sometimes construction sites hit them and then spend days filling then with rock so that they can continue building