LIQUEFACTION SUSCEPTIBILITY MAPPING FOR SAN FRANCISCO, CALIFORNIA.

A map depicting the susceptibility of near-surface cohesionless soil deposits within the downtown area of San Francisco to earthquake induced liquefaction is developed. Susceptibility is defined on the basis of grain size characteristics and equivalent Standard Penetration Test blow count. Typical profiles containing information on soil type, blow count, and water table depth are presented for each map zone. Five of the six map zones consist of artificially placed fill material. Zone boundaries within the fills had to be determined primarily from historical accounts of fill source and method of placement, supplemented with over 350 bore logs. Information on soil characteristics and results of dynamic penetration tests were obtained from the bore logs. A wave-equation model of dynamic penetration tests was used to convert non-standard dynamic penetration test results to equivalent standard blow counts.