Collaborative Research: Broadband Seismic Measurements on the Deep Ocean Floor: A Pilot Experiment

9523658 Yamamoto这支来自伍兹霍尔海洋研究所的调查小组（马萨诸塞州），斯克里普斯海洋学研究所（加州大学圣地亚哥分校，加州）和罗森斯蒂尔海洋和大气科学学院（迈阿密大学，佛罗里达）将联合开发和测试三种类型的深海地震仪，作为一套海洋传感器的试点实验，以扩大现有的陆基“一个真正覆盖全球的地震网络。 宽带地震仪的全球地震覆盖提供了以目前不可能的分辨率准确确定地球内部结构的能力，并提供了显著改善海啸警报的能力。 本项目中使用的仪器均为“宽带”传感器，将分别部署在1）海底，2）略埋在海洋沉积物中，3）现有海底钻孔中。 所有部署工作将在1997年初进行，为期3个月。钻孔部署将使用一个专门开发的系统（斯克里普斯研究所）将仪器放置在钻孔中;埋在地下的传感器将使用迈阿密大学开发的系统放置。 测试将在夏威夷附近进行，所有三个系统的结果将与奥廷加岛上的一个永久性陆地地震仪进行比较，并相互比较。 该项目由NSF地球科学理事会海洋科学和地球科学部门共同支持，并遵循早期的组件仪器开发和测试计划。 预计这一测试将有助于决定未来“海洋地震网络”部署的最佳部署类型（地面、埋地或钻孔）。 ***

9523658 Yamamoto This team of investigators from Woods Hole Oceanographic Institution (Massachusetts), Scripps Institution of Oceanography (University of California, San Diego, California) and Rosenstiel School of Marine and Atmospheric Sciences (University of Miami, Florida) will jointly develop and test three types of deep-ocean seismometers as a pilot experiment for a set of ocean sensors to expand the existing land-based "global" seismic network to one which has truly global coverage. Global seismic coverage with broadband seismometers provides a capability to accurately define the interior structure of the earth with resolution presently not possible, and it provides a capability to significantly improve warnings for tsunamis. The instruments to be used in the present project are all "broadband" sensors, and will be deployed respectively 1) lying on the seafloor, 2) buried slightly within marine sediments, and 3) within an existing seafloor drill hole. All deployments will be carried out for the same 3-month period in early 1997. The borehole deployment will use a specially developed system (Scripps Institution) to place the instrument in the borehole; the buried sensors will be emplaced with a system developed at University of Miami. Tests will take place near Hawaii, and results of all three systems will be compared with a permanent land seismometer on the island of Oahu as well as with each other. This project is jointly supported by Ocean Sciences and Earth Sciences Divisions of the Geosciences Directorate at NSF, and follows earlier development and testing programs of component instruments. It is expected that this test will allow decisions to be made about what types of deployments (surface, buried or in drillholes) will be optimum for future "ocean seismic network" deployments. ***