Seismic safety margins research program. Progress report No. 11, 1 Apr 81-30 Jun 81

This document is a progress report on the Seismic Safety Margins Research Program (SSMRP) covering the period April 1, 1981 through June 30, 1981. The report gives a general description of the program, together with financial summaries and individual project details. Each project is summarized to show accomplishments, schedules, milestones and completion dates, budget and expenditures, and any concerns that may affect the project.