NGL Data Maps (IMAGE) University of Texas at Austin Caption LEFT: Interpolated within-event residuals for the 1989 M6.9 Loma Prieta Earthquake generated using the maximum a posteriori spatial correlation model. DOI: 10.1061/9780784485316.018. RIGHT: Comparison of newly estimated and legacy peak ground acceleration (PGA) at liquefaction case history sites. Credit Pretell et al. Usage Restrictions by permission License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.