A major concern with adobe in areas such as California, which are prone to earthquakes, is seismic resistance. Classic adobe buildings have withstood centuries of earthquakes because their buttressed walls are relatively thick for their height, and are topped with sturdy wood beams. Modern, thin-walled adobe structures have proven to be insecure in an earthquake, unless carefully reinforced with steel and concrete, braced frequently, tied together with a beam, and securely linked to their foundations.
Adobe was the earliest building material of Egypt and Assyria, and, as well the southwestern states of the US, Mexico, and Central America, is still used in China and Japan.
Related category• BUILDING AND ARCHITECTURE
• MATERIALS AND MATERIALS SCIENCE
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