This award supports an international workshop on earthquake research to be held in Santiago, Chile from June 4-7, 1991. The U.S. organizer is John Anderson of the University of Nevada at Reno and his Chilean counterpart is F. Lund of the University of Chile who chairs a local organizing committee consisting of four Chilean scientists, three from U. Chile and one from the Catholic University (PUC). There is also an international scientific committee consisting of scientists from the U.S., France, Italy, Japan and Chile. The par- ticipants will come from all these countries, from Austria and, in Latin America, from Argentina, Brazil, Bolivia, Costa Rica, Ecuador, Mexico, Peru and Venezuela. This workshop aims to bring together seismologists and earthquake engineers who share an interest in research problems that utilize strong motion data. The strong motion program in Chile has collected significant data in recent years, especially from the March 3, 1985 earthquake. Analysis of that data is contributing to our understanding of the earthquake source, wave propagation, and site effects as they affect strong shaking. For the United States and Chile, specific benefits arise because the Cascadia subduction zone off Washington and Oregon, as well as the Alaska subduction zone, are similiar to the Chilean subduction zone. Apart from the attendance of established workers in the field, we expect to have a large participation of younger scientists and engineers from the region who will thus be exposed to the state of the art in strong-motion-related work. This workshop will provide a place for the exposure of U.S. research efforts in the field, and the close contact among participants will generate interest among talented students from Latin America to pursue graduate studies in the U.S. and/or to do postdoctoral work. Thus, it will fulfill the goals of the Science in Developing Countries Program and address education and human resource concerns.