Upgrade to the continuous GPS network on Sierra Negra volcano, Galapagos

升级至加拉帕戈斯内格拉火山的连续 GPS 网络

• 批准号: 0809574
• 负责人: William Chadwick
• 金额: --
• 依托单位: Oregon State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-06-15 至 2010-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0809574&HistoricalAwards=false
• 关键词: Upgrade; continuous; GPS; network; Sierra

The main objective of this project is to add two additional continuous Global Positioning System (CGPS) stations to the existing 8-station CGPS network at Sierra Negra volcano, on the Galapagos island of Isabela. This network, originally installed in June 2002, successfully captured the extraordinary deformation leading up to and during the October 2005 eruption at the Sierra Negra. The eruption was preceded by multiple ?trapdoor faulting? events in the caldera floor, and accelerating inflation that amounted to 2.2 m of uplift in 30 months (?trapdoor faults? are curved faults that bound an uplifted block with a hinge zone on one side, like a trapdoor). More trapdoor faulting, dike intrusion, and subsidence of over 5 m in the caldera were associated with the eruption itself. The two additional CGPS stations will allow the investigators to fill a critical gap in the deformation monitoring, will eliminate ambiguity in satellite radar interferometry (InSAR) scenes that are discontinuous across the fault system, and will help better detection and modeling of the on-going deformation at the volcano. This work is timely because Sierra Negra began to re-inflate as soon as the October 2005 eruption was over and the center of the caldera has already been uplifted by over 2 m. At this rate of inflation, more trapdoor faulting events or eruptions are likely within the next few years. This project will ensure that researchers learn as much as possible from future events at this very active volcano, which is one of the best places on Earth to study the shallow intrusion of magma in space and time.

该项目的主要目的是将两个连续的全球定位系统（CGP）站添加到位于伊莎贝拉加拉帕戈斯岛的塞拉尼格拉岛的现有8台CGP网络。 该网络最初于2002年6月安装，成功捕获了2005年10月在塞拉内格拉（Sierra Negra）爆发之前和期间的非凡变形。 喷发之前是多个陷阱的断层？火山口地板上的事件以及加速的通胀在30个月内高达2.2 m的隆起（？曲板故障？弯曲的断层是否绑定了一个抬高的块与一侧的铰链区域，例如板轮门）。 在火山口中，更多的陷阱门断层，堤防侵入和5 m以上的沉降与喷发本身有关。另外两个CGP站将使研究人员能够在变形监测中填补关键空白，将消除在整个断层系统中不连续的卫星雷达干涉仪（INSAR）场景中的歧义，并将帮助更好地检测和建模Volcano的正在进行的变形。 这项工作之所以及时，是因为塞拉内格拉（Sierra Negra）一旦2005年10月爆发结束，因此火山口的中心已经被超过2 m升高。 以这种通货膨胀率，在未来几年内可能会有更多的陷阱门断层事件或喷发。 该项目将确保研究人员从这个非常活跃的火山的未来事件中学习尽可能多的学习，这是地球上研究岩浆在时空中浅水侵入的最佳场所之一。