Most people think that in the United States, the area around the San Andreas Fault poses the highest risk for a large earthquake. But the risk for a "great earthquake" and tsunami is highest in the Pacific Northwest. Join seismologist Diego Melgar and learn about the risks, the geologic forces behind the potential for a truly massive U.S. earthquake, and efforts underway to build warning systems for the western U.S. Series: "Jeffrey B. Graham Perspectives on Ocean Science Lecture Series" [Science] [Show ID: 29994]