1985 IAAF World Race Walking Cup México, the United Kingdom, the United States, Algeria, Australia, China, Canada, Colombia, and Kenya proceeded directly to the final. México withdrew due to the Mexico City earthquake. Saint-Aubin-lès-Elbeuf, France, June 22/23 Borås, Sweden, June 15 Russe, Bulgaria, June 22/23 This year, China, the Soviet Union, Australia, the United Kingdom, the United States, and Canada proceeded directly to the final. Borås, Sweden, June 15 Russe, Bulgaria, June 22 Saint-Aubin-lès-Elbeuf, France, June 2 1985 IAAF World Race Walking Cup The 1985 IAAF World Race Walking Cup was held on 28 and 29 September 1985 in the streets of St John's, Isle of
1985 Mexico City earthquake their own frequencies of vibration. Those that are six to fifteen stories tall also vibrate at the 2.5-second cycle, making them act like tuning forks in the event of an earthquake. The low-frequency waves of an earthquake are amplified by the mud of the lakebed, which in turn, is amplified by the building itself. This causes these buildings to shake more violently than the earthquake proper as the earthquake progresses. Many of the older colonial buildings have survived hundreds of years on the lakebed simply because they are not tall enough to be affected by the resonance effect. The earthquake