Zigzag Seismic-Resistant Architecture at Caral Used Shicra Bags Around 2600 BCE

Caral’s pyramids were stabilized with woven reed bags filled with stones to withstand earthquakes nearly 4,500 years ago.

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Shicra bags were filled with river stones and layered within pyramid walls to enhance stability.

Excavations at Caral revealed that builders filled large woven reed bags, known as shicra, with stones and embedded them within pyramid platforms. Radiocarbon dating places these construction techniques around 2600 BCE. The Supe Valley sits within a seismically active region of coastal Peru. Using flexible fiber bags allowed structures to absorb and dissipate earthquake energy. This technique demonstrates engineering adaptation long before formal seismic science. Monumental architecture was designed with environmental risk in mind. Structural resilience was intentional rather than accidental. Engineering anticipated instability.

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Seismic adaptation reflects early institutional awareness of environmental hazard. Engineering solutions embedded within monument cores indicate organized planning. Investment in structural resilience suggests long-term urban permanence was expected. The Norte Chico case expands understanding of ancient disaster mitigation. Governance included infrastructure durability. Safety was built into sacred architecture. Risk management predates modern terminology.

For inhabitants, surviving earthquakes reinforced trust in communal construction methods. The psychological reassurance of stable monuments strengthens civic identity. Individuals likely associated resilient structures with divine favor. The irony is that woven reed bags, humble in material, preserved massive pyramids. Flexibility secured permanence.

Source

UNESCO World Heritage Centre – Sacred City of Caral-Supe

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