Development of GIS Database for Historic Liquefaction Sites in Japan,416-2008

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Liquefaction has been known to occur repeatedly at the same site during successive earthquakes. Maps showing locations of past liquefaction occurrences are very useful to delineate and characterize areas of liquefaction susceptibility for future earthquakes. Thus the author has collected records on occurrences of liquefaction phenomena triggered by 123 Japanese earthquakes during the period of 416-1990 and compiled into a book entitled“Maps for historic liquefaction sites in Japan"(Wakamatsu,1991). Since then,extensive liquefaction has been observed during more than a dozen earthquakes including the 1995 Hyogoken-nambu(Kobe)earthquake. The author has supplemented the previous work with data from the earthquakes since 1991 as well as newly found data for the earthquakes before 1990,and digitized the sites of liquefaction into a GIS database. The investigation revealed that: a total of 150 events with magnitudes ranging from 5.2 to 8.6 have induced iquefaction since 416,when earthquake damage has been documented in Japan; approximately 16500 sites of liquefaction appeared throughout Japan due to the earthquakes; most of them are located on lowlying areas underlain by liquefiable Holocene sediments and artificial fills; and the liquefaction in Tokyo metropolitan area was induced by seismic shaking with an intensity of V and greater on the JMA scale.
関東学院大学工学総合研究所の論文