Tracking melt movement through the Icelandic crust using microearthquakes

该项目的目的是应用新开发的微地震震源测绘，利用冰岛的世界级数据集跟踪地壳中的熔体运动，该数据集正在进行中，可追溯到20年前。具体目标区域将包括北方火山区最近活跃的火山下的管道系统，包括目前正在膨胀并准备喷发的Bardarbunga火山、Grimsvotn和Askja。这将为研究从地壳底部到地表的熔体运动提供一个很好的机会（见哈德逊et al. 2017和Agustdottir et al. 2019）。学生将加入一个经验丰富的实地工作团队，为我们位于冰岛中部的宽带地震仪阵列提供服务（目前有29台仪器），然后将新数据与我们的该地区地震数据目录相结合，该目录可追溯到2007年。然后，他们将使用剑桥新开发的强大工具来精确地绘制震源位置，直到非常小的震级：目前我们记录c。每年在研究区域发生10，000起事件。这是世界上对活火山裂谷最详细的调查，很可能导致对熔体穿过地壳和喷发方式的重要新理解。许多用于分析的计算机程序已经存在，尽管学生可能希望进一步开发其中的一些程序用于自己的分析。

The aim of the project is to apply newly developed microseismic hypocentre mapping to track melt movement through the crust using our world-class dataset from Iceland, which is ongoing and extends back two decades. Particular target areas will include the plumbing systems beneath recently active volcanoes in the Northern Volcanic Zone, including the currently inflating and primed to erupt Bardarbunga volcano, Grimsvotn and Askja. This will offer a great opportunity to study melt movement all the way from the base of the crust to the surface (see Hudson et al. 2017 and Agustdottir et al. 2019).The student will join an experienced fieldwork team in servicing our broad-band seismometer array in central Iceland (currently with 29 instruments), then integrating new data with our catalogue of seismic data in the region, which extends back to 2007. They will then use powerful tools newly developed in Cambridge to accurately map the hypocentre locations down to very small magnitudes: currently we record c. 10,000 events per year in the study area. This is the most detailed survey of an active volcanic rift anywhere in the world, and is likely to lead to significant new understanding of the way melt travels through the crust and erupts. Many of the computer programs for the analysis already exist, though it is likely that the student will want to further develop some of these for their own analysis.