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

ARAD三维地震实验是美国斯克里普斯海洋研究所与剑桥大学合作进行的一项实验。 1997年9 - 10月在Ewing号考察船上进行了一次野外试验，试验地点位于东太平洋海隆北9度重叠扩张中心上空。 这项实验的关键内容包括第一次对海洋中部扩张中心进行三维反射测量和一次同步三维地壳层析成像实验。 初步的数据分析表明，所观察到的分布的地壳岩浆积累下的重叠扩张进入似乎是不一致的，一个简单的，大致对称的结构或模型，描绘的lims在衰减端的岩浆系统主要是喂Y水平流。 相反，岩浆似乎是直接从盆地内部注入的。 计划在赠款期内进行进一步分析。

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.