An earthquake of about magnitude 8 struck the Wei River valley near Huaxian on 23 January 1556, damaging settlements across Shaanxi, Shanxi and Henan and triggering landslides, ground fissures and river diversions. Ming records put the death toll near 830,000, the highest of any recorded earthquake, chiefly because most of the population lived in yaodong, cave dwellings cut into soft loess cliffs, which collapsed on people sleeping inside. City walls, temples and the stelae of Xi'an's Forest of Steles were toppled or damaged. Survivors such as the scholar Qin Keda recorded practical lessons, advising people indoors to crouch and wait rather than run out, and local monographs record rebuilding in lighter bamboo and timber instead of heavy masonry.
It produced one of the earliest recorded bodies of seismic guidance on how to site, build and behave in an earthquake zone, and shifted rebuilding practice in loess China toward lighter structures and safer siting of dwellings. It remains the benchmark case that urban disaster mortality is set by settlement form and ground conditions rather than by the shaking alone.
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