Learning from the Mexican Earthquake of September 19, 1985: Effect of Site Conditions on Ground Motion and Building Damage

该研究项目将调查当地土壤条件和地形变化对地震引起的强地震动及其对建筑物的破坏的影响。例如，加速度计记录显示，在墨西哥城的软粘土层相对较深的地区，与城市的其他地区相比，在坚硬的土壤沉积物或岩石状条件下，震动强度要大得多。研究还认为，局部土壤条件的不连续性，如靠近地铁站和隧道、高速公路地下通道和坚硬的土壤界面，导致了地面运动的显著局部放大。

This research program will investigate the effect of local soil conditions and topographic changes on earthquake-induced strong ground motion and the resulting damage to buildings. For example, accelerograph records show that much greater intensities of shaking occurred in those parts of Mexico City underlain by relatively deep layers of soft clay as compared to other parts of the city underlain by stiff soil deposits or rock-like conditions. It is also believed that local discontinuities in soil conditions, such as the proximity of Metro stations and tunnels, highway underpasses, and stiff soil interfaces, resulted in a significant local amplication of the ground motions.