![]() Traditionally, seismic intensity is typically obtained by experts who investigate the building damage and human response to an earthquake in an area where that earthquake strikes. IntroductionĪs a qualitative index to describe the ground vibration and degree of damage caused by an earthquake, the seismic intensity provides a simple macroscopic scale to characterize the magnitude of an earthquake’s impact on human communities, so it is widely used in earthquake disaster assessment, loss estimation, structural response analyses, historical earthquake disaster recurrence, and other fields all over the world. To quantify the regional variations, a regional correction factor for China, suitable for adjustment of global relationships, has also been estimated. Furthermore, we compare the results of this study with previously published works and analyze the regional dependence of conversion equations. To account for and eliminate the trends in the residuals, we introduce a magnitude-distance-depth correction term and obtain the improved relationships. The influence of moment magnitude, hypocentral distance, and hypocentral depth on the residuals of conversion equations is also explored. ![]() ![]() Based on the analysis of the distribution of the dataset, the reversible conversion relationships between modified Mercalli intensity (MMI) and peak ground acceleration (PGA), peak ground velocity (PGV), and pseudo-spectral acceleration (PSA) at natural vibration periods of 0.3 s, 1.0 s, 2.0 s, and 3.0 s are obtained by using the orthogonal regression. In this study, we use the strong motion records and seismic intensity data from 11 moderate-to-strong earthquakes in the mainland of China since 2008 to develop new conversion equations between seismic intensity and peak ground motion parameters. ![]()
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