Dynamic properties of champlain sea clays

众所周知，在加拿大东部的地震活跃区，Champlain海沉积物（或“Leda粘土”）由于软土和基岩之间的阻抗差异大，特别容易受到地面运动的放大。然而，目前对Leda粘土的动态特性随频率或循环阻力比的变化的了解是有限的;因此，这些影响在中等至大应变水平下对地震波衰减或放大以及这些细粒土的循环软化敏感性有多重要还不确定。

It is well-known that, in seismically-active regions of Eastern Canada, Champlain Sea sediments (or 'Leda Clays'), are particularly prone to amplified ground motions due to large impedance contrasts between soft soils and bedrock. However, the current knowledge on the variation of the dynamic properties of Leda Clays with frequency or their cyclic resistance ratios is limited; thus, there is uncertainty on how important these effects may be on both the seismic wave attenuation or amplification at moderate to large strain levels and the cyclic softening susceptibility of these fine-grained soils.