Collaborative Research: Linking stress changes and hydrothermal activity during a non-eruptive spreading event.

合作研究：将非喷发扩散事件期间的应力变化和热液活动联系起来。

• 批准号: 0937285
• 负责人: Emilie Hooft Toomey
• 金额: $ 17.76万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0937285&HistoricalAwards=false
• 关键词: Collaborative; Research; Linking; stress; changes

Mid ocean ridges are sites of creation of new ocean floor, a process that is characterized by high seismicity (earthquakes) and active volcanism, and vigorous hydrothermal circulation. The latter is evidenced by jets of super heated water rising from vents in the sea floor (the now-famous black smokers) that support exotic biological communities. An important scientific goal is understanding the dynamics of these systems. Earthquakes occur within the upper brittle crust in response to stresses and their distribution in space and time is a primary source of information about dynamic subsurface geologic processes. These earthquakes are associated with both the tectonic and magmatic events that account for plate spreading and they create fractures that influence the patterns of hydrothermal circulation, heat extraction and water-rock reactions. As such, long duration studies of micro-earthquakes are key to multidisciplinary studies of the dynamic processes are mid-ocean ridges. The objectives of this project are to infer spatial and temporal patterns of stress changes associated with the earthquake swarms in late January and February 2005, to understand the impact of the associated regional spreading event on the characteristics of hydrothermal systems and magmatic segmentation, and to determine how stress changes associated with the regional spreading event affect seismic anisotropy and tidal triggering.

中海脊是创造新海底的地点，这一过程的特征是高地震性（地震）和活跃的火山和剧烈的热液循环。后者可以通过支持异国生物群落的海底（现为著名的黑人吸烟者）的通风口（现为著名的黑人吸烟者）升起的超热水喷射来证明。一个重要的科学目标是了解这些系统的动态。地震发生在上层脆皮内，响应于应力，其在时空中的分布是动态地下地质过程的主要信息来源。这些地震与构成板的构造事件和岩浆事件有关，这些事件解释了板的扩散，它们会产生裂缝，影响水热循环，热萃取和水摇滚反应的模式。因此，微地点的长时间研究是动态过程的多学科研究的关键，是中端脊。该项目的目的是推断2005年1月下旬和2005年2月与地震群相关的压力变化的空间和时间模式，以了解相关区域扩散事件对水热系统和magmatic分段特征的影响，并确定与区域扩散事件相关的应力变化如何影响静态型Anisistal anisotryrepropy and Tidal triggering。