地震是没有国界的,诸如1985年袭击墨西哥城的灾害性地震的威胁,已日益引起圣迭戈-蒂华纳大城市地区的400万居民的关注。面对这一持续的成胁,墨西哥和美国政府制定了“美国-墨西哥防备自然灾害合作协议”。该合作协议开始于1980年,并于1983年经里根总统和德拉马德里总统重新确认而建立了墨西哥-美国地质现象小组委员会。该小组委 Without earthquakes, earthquakes, such as the threat of a catastrophic quake that hit Mexico City in 1985, have increasingly drawn the attention of 4 million inhabitants of the large city of San Diego - Tijuana. Faced with this ongoing threat, Mexico and the United States Governments have enacted the “U.S.-Mexican Cooperation in Preparedness for Natural Disasters.” The agreement began in 1980 and was reconfirmed by President Reagan and President de la Madrid in 1983 to establish the Mexican-American Geological Phenomenon Commission. The organizing committee