1985 Mexico City earthquake

A magnitude 8.0 earthquake struck off Mexico’s Pacific coast on September 19, 1985. Its seismic waves caused catastrophic damage in Mexico City, especially on soft lake-bed sediments.

Mexico City basin: A highland basin containing Mexico City, underlain in part by soft sediments of ancient lake beds. Its soft lake-bed deposits amplified and prolonged shaking from the distant earthquake.
Mexico City rescue brigades: Volunteer groups that searched for and rescued people trapped in collapsed buildings after the 1985 earthquake. Organized volunteers filled gaps in the initial official response and became a lasting symbol of civic action.
Hotel Regis: A landmark hotel in central Mexico City that collapsed during the 1985 earthquake. Its destruction became one of the disaster’s most recognizable scenes.
Miguel de la Madrid: Mexican president from 1982 to 1988, whose administration managed the federal response to the 1985 earthquake. His government’s response drew criticism as volunteers organized rescue and relief efforts.
Lake-bed effect: The amplification and prolongation of seismic waves by soft sediments deposited in former lakes. This effect explains why central districts suffered far more damage than the epicentral distance suggests.
1985 Mexico City earthquake labor movement: A labor-organizing movement formed by garment workers after earthquake damage exposed unsafe factories and exploitative conditions. The collapse of garment workshops helped workers press for recognition and safer conditions.
Nuevo León building: A residential building complex in the Tlatelolco housing development that suffered catastrophic collapse in the 1985 earthquake. Its collapse caused extensive loss of life and became a focal point for rescue efforts.
Elena Poniatowska: Mexican writer and journalist known for documenting social movements and ordinary people’s experiences. Her book Nada, nadie records testimonies and scenes from the earthquake’s aftermath.
Mexico subduction zone: The convergent plate boundary where the Cocos Plate descends beneath the North American Plate along Mexico’s Pacific margin. Movement along this boundary generated the offshore earthquake.
1985 Mexico City earthquake building code: A revised set of Mexico City construction rules introduced after the 1985 earthquake to improve seismic safety. The scale and pattern of structural failures drove stricter design requirements.

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