Amplitude Variation with Offset Studies and Pre-stack Imaging of the ARAD 3-D Reflectivity Volume

脊轴不连续解剖（ARAD）三维地震实验是英国斯克里普斯海洋研究所与英国剑桥大学的合作实验。野外试验于1997年9 - 10月在东太平洋隆起北纬9度重叠扩散中心进行。这次实验的关键要素包括首次对大洋中部扩张中心进行三维反射调查和同时进行的三维地壳断层扫描实验。初步的数据分析表明，在重叠扩张入口下观察到的地壳岩浆聚集分布似乎不符合简单的、大致对称的结构，也不符合描述主要由水平流动提供的岩浆系统的衰减末端边缘的模型。相反，岩浆似乎是直接从离断盆地的下方流入的。计划在本赠款期间进行进一步分析。

The Anatomy of a Ridge Axis Discontinuity (ARAD) 3-D seismic experiment is a cooperative experiment between Scripps Institution of Oceanography and Cambridge University. The field experiment was conducted aboard the R/V Ewing in Septemer-October 1997 and was located over the 9 degrees north overlapping spreading center on the East Pacific Rise. Key elements of this experiment included the first 3-D reflection survey of a mid-ocean spreading center and a coincident 3-D crustal tomography experiment. Preliminary data analysis suggests that the observed distribution of crustal magma accumulations beneath the overlapping spreading enter appear to be inconsistent with either a simple, broadly symmetrical structure or with models which depict the lims at attenuated ends of magmatic systems fed largely y horizontal flow. Instead the magma seems to be fed from directly eneath the offset basin. Further analyses are planned during the period of this grant.