A Collaborative Proposal: Prototype Development of Under Ice Ocean Bottom Seismometer

这是斯克里普斯海洋学研究所和伍兹霍尔海洋学研究所的主要研究人员的合作项目。主要调查人员将把联合收割机自主水下航行器和海底地震仪技术结合起来，开发一种能够在北冰洋冰盖下的海底进行宽带地震测量的仪器。 仪器的结构将基于Odyssey 11自主式潜水器的设计，地震计组件将基于Spahr Webb在Scripps开发的“Webb”OBS。 这些技术将被整合到一个单一的仪器中，能够从破冰船上部署和回收，并能够在海底进行长达一年的宽带地震测量，开发这一仪器的动机来自对地震观测的迫切需要，以限制地幔中熔体产生的性质，地壳结构，以及与超缓慢扩张的加克尔山脊有关的构造运动。 加克尔海岭基本上没有取样，因为它位于北冰洋永久冰盖之下。 全球扩张系统之谜的这一关键部分提供了一个机会，可以对被其他扩张环境掩盖或隐藏的地壳增生和地幔过程进行成像。 通过一系列国际大洋中脊协会讲习班，制定了研究加克尔海脊的国际实地方案的后勤和优先事项。 最高优先事项之一是获取被动和主动震源地震数据。 在Gakkel海脊的海底进行地震测量是不可能的，但随着AUVOBS仪器的开发，北冰洋海盆可以进行地震调查。 主要研究人员将解决与部署和从浮冰中的破冰船回收AUV以及修改AUV以进行长时间原位海底测量相关的一级问题。 除了开发AUVOBS原型外，他们还将开发技术和硬件，以便在未来为各种北极（和南极）科学任务常规部署AUV。

AbstractOPP-99-06674SohnThis is a collaborative project by Principal Investigators from Scripps Institution of Oceanography and Woods Hole Oceanographic Institution. The Principal Investigators will combine autonomous underwater vehicle (AUV) and ocean bottom seismometer (OBS) technologies to develop an instrument (AUVOBS) capable of making broadband seismic measurements on the seafloor beneath the Arctic Ocean ice cap. The structure of the instrument will be based on the Odyssey 11 AUV design and the seismometer package will be based on the "Webb" OBS developed by Spahr Webb at Scripps. These technologies will be integrated into a single instrument capable of being deployed and recovered from an icebreaker, and capable of making broadband seismic measurements over periods of up to one year on the seafloor.The motivation for developing this instrument arises from the pressing need for seismic observations to constrain the nature of melt production in the mantle, crustal structure, and tectonism associated with the ultra-slow spreading Gakkel Ridge. The Gakkel Ridge is essentially unsampled because it lies beneath the Arctic Ocean permanent ice cap. This key piece of the global spreading system puzzle provides an opportunity to image crustal accretion and mantle processes that are masked or hidden in other spreading environments. The logistics and priorities for an international field program to study the Gakkel Ridge have been developed through a series of InterRidge workshops. One of the highest priorities is the acquisition of passive and active source seismic data. It has been impossible to make seismic measurements on the seafloor at the Gakkel Ridge, but with the development of an AUVOBS instrument, the Arctic Ocean Basin could be opened to seismic investigation. The Principal Investigators will solve the first order problems associated with deploying and recovering AUVs from icebreakers in the ice pack and modifying AUVs to make in situ seafloor measurements over long periods of time. In addition to developing an AUVOBS prototype, they will also develop techniques and hardware that will allow the routine deployment of AUVs for a variety of Arctic (and Antarctic) science missions in the future.