Tracking melt movement through the Icelandic crust using microearthquakes

该项目的目的是利用我们来自冰岛的世界级数据集，应用新开发的微地震震源测绘来跟踪地壳中的融化运动，该数据集正在进行中，可以追溯到20年前。特别的目标区域将包括北部火山区最近活跃的火山下面的管道系统，包括目前正在膨胀并准备喷发的巴尔达邦加火山、格里姆沃特火山和阿斯卡火山。这将为研究从地壳底部到地表的融化运动提供一个很好的机会（见Hudson等人2017年和Agustdottir等人2019年）。该学生将加入一个经验丰富的实地工作小组，为我们在冰岛中部的宽带地震仪阵列（目前有29台仪器）提供服务，然后将新数据与我们自2007年以来在该地区的地震数据目录进行整合。然后，他们将使用剑桥大学新开发的强大工具，精确地绘制震源位置，精确到非常小的震级：目前，我们在研究区域每年记录约10,000次地震。这是对世界上任何地方的活火山裂谷进行的最详细的调查，可能会对融化物穿过地壳和喷发的方式产生重要的新认识。许多用于分析的计算机程序已经存在，尽管学生很可能想要进一步开发其中的一些用于他们自己的分析。

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.