Collaborative research: Crustal magma plumbing of the Santorini volcanic system

合作研究：圣托里尼火山系统的地壳岩浆管道

• 批准号: 1459794
• 负责人: Emilie Hooft Toomey
• 金额: $ 50.96万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-01 至 2020-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1459794&HistoricalAwards=false
• 关键词: Collaborative; research; Crustal; magma; plumbing

Santorini is an active arc volcano associated with the Mediterranean subduction zone, which accomodates tectonic convergence between Africa and Europe. Santorini recently experienced geologic unrest and this study will document the current distribution of subsurface magma. Because the volcanic system is semi submerged Santorini is an ideal site for detailed imaging using marine instrumentation. Onshore-only studies cannot achieve broad enough aperture or dense enough coverag to allow mapping of magma throughout the crust. By determining the physical properties of the crust, this international team from the U.S., U.K., and Greece, seek to understand how magma at different depths crystallizes and what that might imply about both a basic research question- how does crust that eventually makes up continents form, and a geohazard question- does the current distribution of magma indicate a likelihood of sustained volcano inflation that might precede a major eruption? A US student will gain seismic data acquisition experience and training in state-of-the-art processing methods, while also learning to work within an international research team. Seismic imaging of the crust at Santorini volcano is designed to constrain the distribution of subseafloor magma and any variation in extent of apparent degree of crystallization with depth. This site is viewed as representative of silicic arc volcanoes worldwide, so results could be representative of other arc volcanoes. Ocean bottom seismometers, and land seismometers will be deployed for a few-week field experiment. Active source signals will be recorded by these instruments as well as by a towed, multi-channel streamer. Tracklines laid out along a north-east trending, 10 x 50 mile swath, with Santorini at the center, will be image the lower crustal structure with unprecedented resolution. Data analysis emphasizes complementary seismic approaches: (1) Dense 3D isotropic and anisotropic travel time tomography (2) Full waveform inversion tomography and waveform modeling to obtain higher resolution and more accurate elastic properties and their spatial variability.

圣托里尼是一座与地中海俯冲带有关的活弧火山，该俯冲带容纳了非洲和欧洲之间的构造会聚。圣托里尼最近经历了地质动荡，这项研究将记录地下岩浆的当前分布。由于火山系统是半淹没的圣托里尼岛是一个理想的网站，详细成像使用海洋仪器。仅在陆地上进行的研究无法获得足够宽的孔径或足够密集的覆盖面，从而无法绘制整个地壳的岩浆图。通过确定地壳的物理特性，这个来自美国的国际团队，英国、和希腊，试图了解不同深度的岩浆是如何结晶的，以及这可能意味着一个基本的研究问题--最终构成大陆的地壳是如何形成的，以及一个地质灾害问题--目前岩浆的分布是否表明在一次大喷发之前可能存在持续的火山膨胀的可能性？美国学生将获得地震数据采集经验和最先进的处理方法的培训，同时还学习在国际研究团队中工作。圣托里尼火山地壳的地震成像是为了限制海底岩浆的分布和视结晶度随深度的任何变化。该地点被视为全世界弧火山的代表，因此结果可能代表其他弧火山。将部署海底地震仪和陆地地震仪进行为期几周的实地实验。活动震源信号将由这些仪器以及拖曳的多通道拖缆记录。以圣托里尼岛为中心，沿着沿着东北方向的10 x 50英里的狭长地带铺设的轨道线，将以前所未有的分辨率拍摄下地壳结构。数据分析强调补充地震方法：（1）致密三维各向同性和各向异性走时层析成像（2）全波形反演层析成像和波形建模，以获得更高的分辨率和更准确的弹性属性及其空间变异性。

项目成果

Backarc tectonism, volcanism, and mass wasting shape seafloor morphology in the Santorini-Christiana-Amorgos region of the Hellenic Volcanic Arc

弧后构造作用、火山作用和质量消耗塑造了希腊火山弧圣托里尼-克里斯蒂安娜-阿莫尔戈斯地区的海底形态

• DOI: 10.1016/j.tecto.2017.06.005
• 发表时间: 2017
• 期刊: Tectonophysics
• 影响因子: 2.9
• 作者: Hooft, Emilie E.E.;Nomikou, Paraskevi;Toomey, Douglas R.;Lampridou, Danai;Getz, Claire;Christopoulou, Maria-Eleni;O'Hara, Daniel;Arnoux, Gillean M.;Bodmer, Miles;Gray, Melissa
• 通讯作者: Gray, Melissa

Relationship Between Active Faulting/Fracturing and Magmatism Around Santorini: Seismic Anisotropy From an Active Source Tomography Experiment

圣托里尼岛周围活动断层/断裂与岩浆活动之间的关系：来自活动源断层扫描实验的地震各向异性

• DOI: 10.1029/2021jb021898
• 发表时间: 2021
• 期刊: Journal of Geophysical Research: Solid Earth
• 作者: Heath, B. A.;Hooft, E. E. E.;Toomey, D. R.;Paulatto, M.;Papazachos, C. B.;Nomikou, P.;Morgan, J. V.
• 通讯作者: Morgan, J. V.

Applying planetary mapping methods to submarine environments: onshore-offshore geomorphology of Christiana-Santorini-Kolumbo Volcanic Group, Greece

将行星测绘方法应用于海底环境：希腊克里斯蒂安娜-圣托里尼-科伦坡火山群的陆上-海上地貌

• DOI: 10.1080/17445647.2021.1880980
• 发表时间: 2021
• 期刊: Journal of Maps
• 影响因子: 2.2
• 作者: Huff, Alexandra E.;Nomikou, Paraskevi;Thompson, Lisa A.;Hooft, Emilie E.;Walker, Ian J.
• 通讯作者: Walker, Ian J.

Gravity observations on Santorini island (Greece): Historical and recent campaigns

圣托里尼岛（希腊）的重力观测：历史和最近的活动

• DOI: 10.31577/congeo.2021.51.1.1
• 发表时间: 2021
• 期刊: Contributions to Geophysics and Geodesy
• 影响因子: 0.7
• 作者: PARASKEVAS, Melissinos;PARADISSIS, Demitris;RAPTAKIS, Konstantinos;NOMIKOU, Paraskevi;HOOFT, Emilie;BEJELOU, Konstantina
• 通讯作者: BEJELOU, Konstantina

Magma accumulation beneath Santorini volcano, Greece, from P-wave tomography

• DOI: 10.1130/g47127.1
• 发表时间: 2020-03-01
• 期刊: GEOLOGY
• 影响因子: 5.8
• 作者: McVey, B. G.;Hooft, E. E. E.;Papazachos, C. B.
• 通讯作者: Papazachos, C. B.