An Yin

An Yin (June 24, 1959 – July 12, 2023) was a Chinese-American earth scientist and a Distinguished Professor of Geology at the University of California, Los Angeles (UCLA). His early work explores the mechanical origin and kinematic evolution of low-angle normal faults and thrust systems in the North American Cordillera. He is perhaps best known for his work on the tectonic evolution of the Himalayas and Tibetan plateau. His research interests shifted in later years to slow-earthquake mechanics, early Earth tectonics, and planetary studies.