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A major source of earthquake-related damage and casualties in northern California has been ground failures generated by the seismic shaking, including la~dslid~J,,la~ef.a~~~f~~d~!, .gr~unr. sLIs: ment, andsurface cracks. The historical record shows that, except far ashore shocks, the area affected and the qu~antity and / general severity of ground failures increase markedly with Richter magnitude. Hence, the largest historical event, the 1906 San Francisco earthquake, has been the most important generator of ground failures. Because of recent population growth and land development in northern California, the potential for damage in future events is enormous compared with that existing in 1906. Reports of the 1906 San Francisco earthquake and other northern California earthquakes and descriptions of ground failures therein are used to (1) identifv and clarifv the tvoes of mound failures as-. sociated with earthquakes, (2) provide a guide for engineers, planners, and others responsible for minimizing seismic hazards, and (3) form a data base for other geotechnical studies of earthquaketriggered pound failures. ential settlements, and ground cracks. In this study, earthquake reconnaissance reports and newspaper reports from past events in northern California are reviewed, and ground failures described therein are identified, classified by present criteria, and located on modern maps. The purposes of this study are (1) to identify and clarify the types of ground failures associated with earthquakes, (2) to provide a guide for engineers, planners, and others responsible for minimizing seismic hazards, and (3) to form a data base for further geotechnical studies of earthquake-triggered ground failures. ~ ~ Each reported ground failure site has been given a location number, and descriptions of that failure excerpted from the literature are tabulated by location influence on ground failure development as well as distance from the causative fault. Areas especially vulnerable to ground failure in northern California have been oversteepened slopes, such as mountain cliffs, streambanks, and coastal bluffs, and lowland deposits, principally Holocene fluvial deposits, deltaic deposits, and poorly compacted fills. Liquefaction has been the direct cause of most lowland failures. The historical record suggests that ground failures during future large earthquakes are most likely to occur a t the same or geologically similar locations as failgres during previous earthm,rka. ~;alogie, hydrologic, and topographfc setting have an important

Historic ground failures in Northern California triggered by earthquakes