Jim Berkland County Geologist for Santa Clara County from 1973 until he retired in 1994. Berkland's predictions have been either self-published in his newsleter or website, or announced in various interviews or speaking engagements. His notoriety arose from an interview published in the Gilroy Dispatch on October 13, 1989, where he predicted that an earthquake with a magnitude between 3.5 and 6.0 would occur in the San Francisco Bay Area between October 14 and October 21. The 6.9-magnitude Loma Prieta earthquake occurred on October 17, just four days later. Berkland claims that government officials told him not to make any more predictions,
1989 Loma Prieta earthquake by the WGCEP in 1988 was coincidental. The contrasting characteristics of the 1906 and 1989 events were examined by seismologists Hiroo Kanamori and Kenji Satake. The significant amount of vertical displacement in 1989 was a key aspect to consider because a long-term sequence of 1989-type events (with an 80–100-year recurrence interval) normally result in regions with high topographic relief, which is not seen in the Santa Cruz Mountains. Three scenarios were presented that might explain this disparity. The first is that the geometry of the San Andreas Fault goes through a transition every several thousand years. Secondly, slip type could