Imaging the Upper Crust at Newberry Volcano Using Large-Offset Reflections

这是SGER的一个奖项，它将利用之前资助的CD项目（高熔岩平原实验）中的炸药爆炸，对俄勒冈州中部纽贝里火山下的岩浆室进行地震成像。纽伯里火山是一座最近才活跃的大型火山，据认为它下面有一个浅层岩浆库。本项目将扩展高熔岩平原实验，利用反射的P波和S波成像假设的地壳岩浆池。pi将使用现有的成像方法和一种新的实验技术，利用大偏移爆炸源对浅层大陆岩浆系统进行成像。充满岩浆的断层，即使空间范围有限，也会产生大振幅的P波和S波反射，特别是在低入射角时。这些已经在东太平洋隆起岩浆基的海洋地震资料中观察到。该项目将把这种方法扩展到浅层大陆岩浆系统的成像。研究结果将为进一步认识纽贝里火山岩浆管道系统以及岩浆储存与火山作用的关系提供依据。纽伯里火山是一个很好的目标，因为它在1300年前就活跃了，美国地质调查局在20世纪80年代的地震断层扫描显示了一个浅层地壳岩浆体。

This is an SGER award which will take advantage of dynamite explosions during a previously funded CD project (the High Lava Plains Experiment) to seismically image the magma chamber underneath the Newberry Volcano in central Oregon. Newberry is a large, recently active volcano that is thought to be underlain by a shallow magma chamber. This project will extend the High Lava Plains Experiment by using reflected P and S waves to image a hypothesized crustal magma sill.The PIs will use existing imaging methods and a new experimental technique to image shallow, continental magma systems using large-offset explosive sources. Magma-filled sills, even of limited spatial extent, give rise to large amplitude P and S wave reflections, particularly at low incidence angles. These have been observed in marine seismic data from magma sills at the East Pacific Rise. The project will extend this method to image shallow, continental magma systems. The results of this study will provide a better understanding of the Newberry Volcano magma plumbing system and the relation between magma storage and volcanic processes. Newberry volcano is an excellent target as it was active as recently as 1,300 years ago and seismic tomography by the USGS in the 1980s indicates a shallow crustal magma body.