Construction and Field-Testing of 16 Broadband Ocean Bottom Seismographs for the OBSIC Fleet

为 OBSIC 舰队建造 16 台宽带海底地震仪并进行现场测试

• 批准号: 1939311
• 负责人: John Collins
• 金额: $ 184.44万
• 依托单位: Woods Hole Oceanographic Institution
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-15 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1939311&HistoricalAwards=false
• 关键词: Construction; Field; Testing; 16; Broadband

Understanding Earth processes, such as mantle dynamics and plate tectonics, and the phenomena they produce, such as earthquakes, volcanoes, and planet-scale elemental cycling, requires sustained deployments of seafloor instruments, since ~ 70% of the earth's surface is covered by the oceans. While data from land-based instruments can tell us much about large-scale structure and earthquake activity under the oceans, many questions related to the structure and dynamics of mid-ocean ridges, hot-spots, subduction zones, and continental margins can only be addressed by data acquired with Ocean Bottom Seismometers (OBSs). Discovery is advanced by an efficient, effective means for scientists to acquire ocean-bottom seismic data. The Ocean Bottom Seismometer Instrument Center (OBSIC) at Woods Hole Oceanographic Institution (WHOI) provides seafloor seismographs and at-sea technical support to all U.S. investigators whose research would benefit from seafloor seismic observations. OBSIC currently operates a fleet of 124 Ocean-Bottom Seismographs (OBS), of which 30 are short-period and the remaining 94 are broadband units of varied type. This award support construction of 16 new broadband ocean-bottom seismographs that will bring the total OBSIC fleet to 150 and the broadband OBS count to 110. The new OBS will carry a Nanometrics Trillium T-240 3-component broadband seismometer and a Differential Pressure Gauge, be deployable to 6000 m, and have an endurance of at least 15 months. The OBS will be equipped with a low-powered Seascan clock disciplined by a power-cycled Chip-Scale Atomic Clock that will provide improved timing accuracy without an undue power penalty. Overall, these new instruments are an important enhancement to the NSF-supported OBS fleet, and will increase OSBIC's capacity to field OBS arrays with greater numbers of instruments, to support additional contemporaneous experiments, and to reduce the wait-time for the deployment of funded experiments.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

了解地球过程（例如地幔动力学和板块构造）及其产生的现象（例如地震、火山和行星尺度的元素循环）需要持续部署海底仪器，因为约 70% 的地球表面被地幔覆盖。海洋。虽然来自陆基仪器的数据可以告诉我们很多有关海底大规模结构和地震活动的信息，但与洋中脊、热点、俯冲带和大陆边缘的结构和动力学有关的许多问题只能通过通过海底地震仪（OBS）获取的数据来解决。科学家通过一种高效、有效的手段获取海底地震数据来推进发现。伍兹霍尔海洋研究所 (WHOI) 的海底地震仪仪器中心 (OBSIC) 为所有美国研究人员提供海底地震仪和海上技术支持，他们的研究将受益于海底地震观测。 OBSIC 目前运营着 124 台海底地震仪 (OBS)，其中 30 台是短周期地震仪，其余 94 台是各种类型的宽带设备。该合同支持建造 16 台新型宽带海底地震仪，这将使 OBSIC 机队总数达到 150 台，宽带 OBS 数量达到 110 台。新 OBS 将携带一台 Nanometrics Trillium T-240 3 分量宽带地震仪和一台差压计，可部署至6000米，续航时间至少为15个月。 OBS 将配备低功耗 Seascan 时钟，并受电源循环芯片级原子钟控制，从而提高计时精度，而不会造成过度的功耗损失。总体而言，这些新仪器是对 NSF 支持的 OBS 舰队的重要增强，并将提高 OSBIC 使用更多仪器部署 OBS 阵列的能力，支持额外的同期实验，并减少部署资助的等待时间。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。