Earth's Interior (IASPEI) Other Earth reference models include iasp91 and ak135. Dziewonski, Adam M.; Anderson, Don L. (June 1981). "Preliminary reference
Times Book of Submarines. page 342 http://www.hazegray.org/danfs/auxil/ak135.txt [bare URL plain text file] "Imperial Submarines". "Archived copy". Archived
the epicenter of an earthquake, including the IASP91 [de] model and the AK135 [de] model. 1972 Smith Prize of the University of Cambridge 1981 Adams Prize