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For more than a millennium, a stone pyramid stood watch over the ancient settlement of Ihuatzio in western Mexico. Built by the Purépecha civilisation, one of the few Mesoamerican powers that successfully resisted Aztec expansion, the monument survived centuries of conflict, weather and human change. Yet in a matter of hours, part of this remarkable structure gave way. Following a period of intense drought and unusually heavy rainfall, a section of the pyramid collapsed into a heap of rubble, alarming archaeologists and local communities alike. While experts point to environmental stresses and structural deterioration, some descendants of the region’s Indigenous inhabitants view the event through a different lens, describing it as a troubling omen reminiscent of warnings recorded in ancestral traditions.
How a 1,100-year-old Purépecha pyramid at Ihuatzio suddenly collapsed into rubble
The collapse occurred on 29 July 2024 at the archaeological site of Ihuatzio in the Mexican state of Michoacán. The damaged monument, approximately 15 metres high, was considered one of the best-preserved structures associated with the ancient Purépecha Kingdom. Archaeological investigations confirmed that the southern section of the pyramid gave way, leaving large quantities of stone and construction material scattered around its base. Ihuatzio was first occupied more than 1,100 years ago and later became an important ceremonial and political centre of the Purépecha civilisation. The site contains pyramidal platforms, tombs and defensive structures that provide valuable insight into one of pre-Hispanic Mexico’s most significant cultures. According to the Institute of Geophysics, National Autonomous University of Mexico, inspections revealed damage affecting multiple stepped sections of the monument, including parts of the exterior walls, retaining walls and internal core.
Archaeologists reveal why drought, torrential rain and structural damage triggered the disaster
Researchers believe the collapse resulted from a combination of prolonged drought and subsequent heavy rainfall.In an official statement recorded by IDR, INAH explained:“The high temperatures, previously recorded in the area, and the consequent drought caused cracks that favoured the filtration of water into the interior of the pre-Hispanic building.” After months of exceptionally dry conditions, intense summer storms struck large parts of Mexico. Water infiltrated cracks that had formed within the pyramid’s structure, weakening internal components and ultimately causing part of the monument to fail. Archaeologists noted that at least six stepped sections showed signs of deterioration. The incident has renewed concerns about the vulnerability of archaeological sites to increasingly extreme weather patterns. Heritage specialists have warned that sudden shifts between drought and intense rainfall can accelerate the deterioration of ancient construction materials, particularly at exposed archaeological monuments.
Why Indigenous descendants call the pyramid collapse a ‘bad omen’ linked to ancient beliefs
While scientists focus on environmental explanations, some members of the modern Purépecha community interpret the collapse through traditional cultural beliefs.A member of the Purépecha community told Science Alert that the event would have been viewed by ancestors as a warning sign. According to reports, he explained:“For our ancestors, the builders, this was a bad omen that indicated the proximity of an important event.” They also noted that similar stories appear in Purépecha oral traditions, where unusual events affecting sacred structures were sometimes interpreted as signs that major changes were approaching. Despite these interpretations, conservation experts are concentrating on stabilising and repairing the damaged monument. INAH has stated that restoration efforts will focus on preserving the structure and protecting an important part of Mexico’s cultural heritage for future generations. Go to Source
