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<br /> <br />20 <br /> <br />~ <br />:! <br />~ <br />~ <br />~ <br />~ <br />m <br />Z <br />< <br />a <br />~ <br />o <br />~ <br />~ <br />z <br />~ <br />~ <br />~ <br />W <br />I <br /> <br /> <br />Like a collcrete house of cards, <br />Mexico City's Benito Juarez <br />Hospital collapsed ill the great <br />Mexico earthquake of 1985, its <br />floors layered tombs for the <br />lIearly 1,000 patiellts alld <br />medical staff trapped withill. <br />Built atop the ullstable silt alld <br />SPOllgy clay of all anciellt lake <br />bed, Mexico City poses <br /> <br />. partiCltlar problems for <br />earthquake engilleL>rs. MallY of <br />the 1 milliOll eIIgilleered <br />buildillgs ill the city were <br />damaged but did 1I0t collapse <br />during the quake, attesting to <br />the partial success of the local <br />building code. But the duration <br />of the ground shaking did <br />topple some buildings, <br />emphasizing the need for <br />continued improvemmt of <br />seisnlic engineering practices. <br /> <br />