(Table 1) Summary of one-dimensional consolidation test results for ODP Leg 133 holes

Most of the sediments at Sites 819 through 821 are underconsolidated, likely the result of high sedimentation rates. Normally consolidated sediments appear at intervals of low sedimentation rate at Site 820. Overconsolidation occurs in the shallowest unit of Site 820, suggesting recent mass wasting, and at the deepest interval, which may define an older erosional surface. At Site 819 for the depth range of 0 to 400 m, porosity is correlated with percentage of mud and is inversely proportional to carbonate content. Mass accumulation rates in the upper 30 m above a major hiatus at Site 819 are fairly constant from 240 to 100 k.y., following a 50-k.y. period of slightly higher accumulation rates. The mass accumulation rate increases steadily from 100 k.y. to the present.819至821站位的绝大多数沉积物均处于欠固结状态，其成因大概率为高沉积速率。820站位在沉积速率较低的层段中可见正常固结沉积物。该站位最浅部地层单元出现超固结现象，指示近期发生过块体运动；其最深层位同样存在超固结，该层位或代表一处古老的侵蚀面。 在819站位0至400米的深度范围内，沉积物孔隙度与泥质含量呈正相关，与碳酸盐含量呈负相关。 819站位主要沉积间断面上方30米上部地层的质量堆积速率，在经历一段为期5万年的略高堆积速率阶段后，于24万至10万年前基本保持稳定；自10万年前至今，质量堆积速率持续稳步上升。