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

使用大偏移反射对纽伯里火山的上地壳进行成像

• 批准号: 0813978
• 负责人: Emilie Hooft Toomey
• 金额: --
• 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: 2008
• 资助国家: 美国
• 起止时间: 2008-08-01 至 2010-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0813978&HistoricalAwards=false
• 关键词: Imaging; Upper; Crust; Newberry; Volcano

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.

这是一个SGER奖，它将在先前资助的CD项目（高熔岩平原实验）期间利用炸药爆炸，从而在俄勒冈州中部的纽伯里火山下面地下图像岩浆室形象。 纽伯里（Newberry）是一个近期活跃的火山，被认为是浅层岩浆室的底座。 该项目将通过使用反射的P和S波来扩展高熔岩平原实验，以对假设的地壳岩浆窗台进行成像。PIS将使用现有的成像方法和一种新的实验技术来对浅层大陆岩浆系统进行图像使用大偏移的爆炸性爆炸源。 充满岩浆的窗台，甚至空间范围有限，都会引起较大的振幅P和S波反射，尤其是在低入射角下。 这些在东太平洋崛起的岩浆窗台的海洋地震数据中观察到了这些。 该项目将将此方法扩展到图像浅的大陆岩浆系统。 这项研究的结果将更好地了解Newberry火山岩浆管道系统以及岩浆存储与火山过程之间的关系。 Newberry火山是一个极好的目标，因为它是1300年前的活跃，而USGS在1980年代进行的地震层析成像表明浅层地壳岩浆体。