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: El Salvador was struck by two devastating earthquakes within a month. The first quake of Jan. 13, 2001, which was centered off El Salvador's southern coast, damaged and/or destroyed nearly 108,000 houses, and killed at least 944 people, including hundreds of residents buried in a huge amount of soil slipped down Las Colinas mountainside in the city of Neuva San Salvador (Santa Tecla). This report outlines the findings obtained through the reconnaissance by the JSCE team and laboratory tests that followed it. Key Words : El Salvador earthquake, landslide, pumice INTRODUCTION Nearly 800 volcanoes are active today or known to have been active in historical times. Of these, more than 75 percent are found in the Pacific Ring of Fire, the belt, partly coinciding with the young mountain ranges of western North and South America, and the volcanic island arcs fringing the north and western sides of the Pacific basin, includes Japan, Peru and El Salvador. The locations of the great majority of earthquakes also correspond to this belt. In these countries, landslides and debris flows are serious threats because of their extremely large travel distances. In the 1970 Peru Earthquake, for example, the huge soil mass of a couple of tens million m

LAS COLINAS LANDSLIDE CAUSED BY THE JANUARY 13, 2001 OFF THE COAST OF EL SALVADOR EARTHQUAKE