Following recorded seismic events in 1857, 1881, 1901, 1922, 1934, and 1966, scientists predicted that another earthquake should occur in Parkfield in 1993.
Considerando os episodios sísmicos de 1857, 1881, 1901, 1922, 1934 e 1966, os científicos prediciron que debería ocorrer outro gran terremoto en Parkfield en 1993.