Most of these questions were examined once again in 1986 following investigations of a suspiciously similar major failure of the Bureau of Reclamation 's Teton Dam in June , 1976 , and a near failure of the Department of Water and Power 's Lower Van Norman Dam in the 1971 San Fernando earthquake . Professor Ronald Scott of Caltech , who had participated in the Casagrande studies , noted at a follow-up 1987 conference on Baldwin Hills that Casagrande had ignored or been unaware of ground movements clearly unrelated to the reservoir ( e.g. those at Stocker-LaBrea ) in his analysis . Another engineer , Stanley Wilson — who had also worked with Casagrande on the 1972 studies and supported the claim that oilfield subsidence was an insignificant cause — now conceded that analogous ground offsets extended well outside the reservoir area , notably in the Stocker-LaBrea area , so that the reservoir and other fault movements could not be attributed to the reservoir itself — thus tacitly attributing responsibility for the failure to oilfield operations . Hence , there appeared to be convergence of opinion on the role of oilfield subsidence and repressurization
1971 San Fernando earthquake
1971 San Fernando earthquake
Baldwin Hills Dam disaster