An Oceanic Mantle Dynamics Workshop, to be held September 18-20, 2002, in Snowbird, Utah

近年来，在大洋下的上地幔中形成了许多流动模型，包括热点的羽流上升和膨胀形成，板块下的小尺度对流，快扩张中心和慢扩张中心下的地幔流动和熔体迁移，从热点到扩张中心的沟道化地幔流动，俯冲板块上方的对流翻转，与传播裂谷有关的软流，澳大利亚-南极不协调面下的下沉，从海沟到海脊的返回流，以及海沟退缩期间俯冲板块的流动。现在，我们第一次进入了一个时代，在这个时代，这些经常是推测的地幔动力学模型可以通过海洋中的测量来检验和改进，这些测量有能力在关键长度尺度上解析地下结构。美国国家海底地震仪仪器库的建立，总共有100多台长时间、宽带仪器，为了解大洋之下上地幔流动的动力学提供了一个机会。第一次海洋地幔动力学社区研讨会将于2002年9月18-20日在犹他州的雪鸟举行。该研讨会有五个主要目标：(1)突出该计划可以完成的科学工作，(2)制定一个“跨越式阵列”计划，(3)确定一个近海组件的设计和技术要求，(4)描述其他领域的计划需求，如地球动力学建模、岩石学/地球化学和实验室测量，以及(5)讨论该计划与其他主要地球科学计划的关系。

In recent years, many models of flow in the upper mantle beneath the oceans have been developed including plume upwelling and swell formation at hotspots, small-scale convection beneath plates, mantle flowand melt migration beneath fast and slow spreading centers, channelized mantle flow from hotspots to spreading centers, convective overturn above subducting plates, asthensopheric flow associated with propagating rifts, downwelling beneath the Australian-Antarctic discordance, return flow fromtrenches to ridges, and flow around subducting slabs during trench rollback. Now, for the first time, we are entering an era when these often speculative models of mantle dynamics can be tested and refined withmeasurements in the oceans that have the power to resolve subsurface structure at the critical length scales. The establishment of a U.S. National Ocean Bottom Seismometer Instrument Pool with a total of more than100 long-duration, wide-band instruments provides an opportunity for progress in understanding the dynamics of flow in the upper mantle beneath the oceans.The first Ocean Mantle Dynamics community workshop will be held September 18-20, 2002 in Snowbird, Utah. This workshop has five major objectives: (1) highlight the science that can be done by the program, (2) develop a plan for "leapfrogging arrays", (3) define the design and technical requirements for an offshore component to USArray, (4) describe program needs in other areas like geodynamic modeling, petrology/geochemistry and laboratory measurements, and (5) descuss the relationship of the program to other major geoscience initiatives.