Earthquake Intensity and Related Ground Motion

accelerograph amplitude analysis appears approximately average basement rock building celeration Centro Change Coast and Geodetic considered consistent constructed curves damage decrease deep sedimentary rock defined designated determined developed discussed distance-intensity graph distribution earthquake effect energy epicentral distance equivalent evidence expect factor fault Figure Figure 12 formations furnish Geodetic Survey geological grades granitic basement granitic rock greater ground motion ground period important increase indicated intensity distribution intensity graph intensity grid intensity level intensity scale intensity-acceleration long-period longer period maximum acceleration measured miles MM intensity motion observed obtained October Olympia overburden Pasadena peak period waves period-acceleration envelopes places plotted portion possible present provisional quantitative record relationship reported represent rock intensity rock outcrop second period seems seismic seismograph shock short-period shown shows similar slope so-called spectrums station strong-motion structures surface tion values various Vernon vibrations waves