ARIAS INTENSITY ASSESSMENT OF LIQUEFACTION TEST SITES ON THE EAST-SIDE OF SAN-FRANCISCO BAY AFFECTED BY THE LOMA-PRIETA, CALIFORNIA, EARTHQUAKE OF 17 OCTOBER 1989

Uncompacted artificial-fill deposits on the east side of San Francisco Bay suffered severe levels of soil liquefaction during the Loma Priet a earthquake of 17 October 1989. Damaged areas included maritime-port facilities, office buildings, and shoreline transportation arteries, r anging from 65 to 85 km from the north end of the Loma Prieta rupture zone. Typical of all these sites, which represent occurrences of lique faction-induced damage farthest from the rupture zone, are low cone pe netration test and Standard Penetration Test resistances in zones of c ohesionless silty and sandy hydraulic fill, and underlying soft cohesi ve Holocene and Pleistocene sediment that strongly amplified ground mo tions. Postearthquake investigations at five study sites using standar d penetration tests and cone penetration tests provide a basis for eva luation of the Arias intensity-based methodology for assessment of liq uefaction susceptibility.