A close-up of one of the scarps bounding the graben of the "L" Street land­slide

A close-up of one of the scarps bounding the graben of the "L" Street land­slide, showing a house which was undercut by subsidence of the graben. A subsidence trough (or graben) formed at the head of the "L" Street land­ slide in Anchorage during the 1964 earthquake. The slide block, which is the virtually unbroken ground moved to the left. The subsidence trough sank 7 to 10 feet in response to 11 feet of horizontal movement of the slide block.