(2) evaluation of Quaternary deposit thickness and depth to groundwater (3) initial evaluation of relative Of a detailed Quaternary geological map delineating deposits age, depositional environment, and texture The liquefaction susceptibility map was developed through a five step process including: (1) preparation Map area includes important lifeline corridors, power plants, industrial and pharmaceutical manufacturing With our previous map that was prepared for the San Juan area (Hengesh and Bachhuber 1999). Most of the area to the south of Bahia de San Juan and Laguna San Jose lies within moderate, low, or very low hazard zones.Ī liquefaction susceptibility map was prepared for the rapidly developing Bayamon area and combined Areas of high hazard occur along the beach and areas in the vicinity of the airport. Extensive swamp deposits and artificial fill over swamp deposits containing loose sandy soils occur in these areas. Areas of very high hazard occur along the edges of Bahia de San Juan and Laguna San Jose. The map depicts five liquefaction hazard zones for the greater San Juan metropolitan area that range from very low hazard to very high hazard. The liquefaction susceptibility map was developed through a five step process including (1) preparation of a detailed Quaternary geology map delineating deposit age, depositional environment, and texture (2) evaluation of Quaternary deposit thickness and depth to groundwater (3) initial evaluation of relative liquefaction susceptibility (decision tree) (4) liquefaction triggering evaluation using geotech- nical borehole data and the Seed and Idriss (1971b) 'simplified procedure' and, (5) identification of units of similar susceptibility and the definition of liquefaction susceptibility zones. The historic earthquakes and paleoliquefaction features demonstrate that the opportunity exists for future liquefaction events to occur in Puerto Rico. 1300, have been found in Holocene floodplain sediments at several sites in western Puerto Rico (Tuttle et al., this volume). Paleoliquefaction features, possibly caused by at least three different earthquakes since A.D. Large earthquakes in 1670, 1787, 1867, and 1918 caused significant damage to major parts of the island, including the San Juan area. Puerto Rico is located in a seismically active region characterized by the convergence and lateral translation of the North America and Caribbean plates. commercial and industrial center in the Caribbean region. San Juan, with an estimated population of 434,000, is the capital of Puerto Rico, and the most important U.S.

This paper discusses development of a 1:20,000 scale liquefaction susceptibility map for the San Juan Quadrangle of Puerto Rico.

San juan puerto rico map