"During the past several years the ESSA Earthquake Research Committee (ERC) has conducted an annual scientific review of all Earthquake Research being done in ESSA. This year the scientific review meeting was held in Boulder, Colorado on 8 and 9 July 1970. All organizational elements of ESSA were encourages to be represented by qualified working scientists who could properly review their entire Earthquake Research program. This review was to include all work being done for ESSA by outside grantees and contractors as well as in house research. The grantees and contractors in most cases were invited to attend and present their own work"--Introduction