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, the opinions on the role of oilfield subsidence and repressurization appeared to converge.