Seismic properties of volcanic rocks from DSDP Hole 62-465A

Hess Rise, a major structural feature in the northern Pacific, is one of several oceanic plateaus which apparently possess anomalous seismic structures (Sutton et al., 1971). Hence, Laboratory measurements of compressional- and shear-wave velocities in rocks from oceanic plateau regions are of considerable interest. Several questions come to mind: (1) Are compressional - wave velocities of volcanic rocks from oceanic plateaus similar to basalts of equivalent age from normal oceanic crust? (2) Do velocity-density relations for plateau rocks fit the well-established trends for Layer 2 basalts? (3) How do Poisson's ratios, determined from compressional- and shear-wave velocities, of oceanic plateau rocks compare with those of normal sea-floor basalts? […]赫斯海隆（Hess Rise）是北太平洋的主要构造特征之一，隶属于一批呈现异常地震构造的大洋高原之列（Sutton等，1971）。据此，针对大洋高原区域岩石开展的纵波与横波速度实验室测量，具备显著的研究价值。由此衍生出若干值得探讨的问题：（1）大洋高原火山岩的纵波速度，是否与正常洋壳中同年代玄武岩的纵波速度相近？（2）高原岩石的速度-密度关系，是否符合业已确立的第二层玄武岩（Layer 2 basalts）演化趋势？（3）由纵波与横波速度计算得到的大洋高原岩石泊松比，与正常海底玄武岩的泊松比相比存在何种差异？[...]