Statistics, ratios and inelastic displacement
Two sets of records considered in this study are for California earthquakes. The first set includes 230 components of records that were used by Miranda (2000) and were found in the database prepared by Silva (2001). This set was adopted by Hong and Jiang (2004) as well.
The second set of records adopted in the present study is the one used by Riddell et al. (2002) to represent earthquakes occurred in California. This set contains 44 records obtained for only two earthquakes, Northridge earthquake and Loma Prieta earthquake. 22 of these 44 components of records are common to the first set. The use of this set of records is aimed at gauging how sensitive are the estimated ratios mentioned previously to the selected records.