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首页> 外文学位 >Lava discharge rate estimates from thermal infrared satellite data at Pacaya Volcano, Guatemala.
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Lava discharge rate estimates from thermal infrared satellite data at Pacaya Volcano, Guatemala.

机译：根据危地马拉帕卡亚火山的热红外卫星数据估算的熔岩排放速率。

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摘要

Time-averaged discharge rates (TADR) were calculated for five lava flows at Pacaya Volcano (Guatemala), using an adapted version of a previously developed satellite-based model. Imagery acquired during periods of effusive activity between the years 2000 and 2010 were obtained from two sensors of differing temporal and spatial resolutions; the Moderate Resolution Imaging Spectroradiometer (MODIS), and the Geostationary Operational Environmental Satellites (GOES) Imager. A total of 2873 MODIS and 2642 GOES images were searched manually for volcanic "hot spots". It was found that MODIS imagery, with superior spatial resolution, produced better results than GOES imagery, so only MODIS data were used for quantitative analyses. Spectral radiances were transformed into TADR via two methods; first, by best-fitting some of the parameters (i.e. density, vesicularity, crystal content, temperature change) of the TADR estimation model to match flow volumes previously estimated from ground surveys and aerial photographs, and second by measuring those parameters from lava samples to make independent estimates. A relatively stable relationship was defined using the second method, which suggests the possibility of estimating lava discharge rates in near-real-time during future volcanic crises at Pacaya.
机译：使用先前开发的基于卫星的模型的改进版本，计算了帕卡亚火山（危地马拉）的五个熔岩流的时间平均排放率（TADR）。从两个时间和空间分辨率不同的传感器获得了2000年至2010年之间进行性活动的图像。中分辨率成像光谱仪（MODIS）和地球静止运行环境卫星（GOES）成像仪。手动搜索了总共2873个MODIS和2642个GOES图像以寻找火山“热点”。结果发现，具有较高空间分辨率的MODIS图像比GOES图像产生更好的结果，因此仅MODIS数据用于定量分析。光谱辐射度通过两种方法转化为TADR：首先，通过最佳拟合TADR估算模型的某些参数（即密度，水泡度，晶体含量，温度变化）以匹配先前从地面勘测和航拍照片估算的流量，其次通过测量来自熔岩样品的参数进行独立估算。使用第二种方法定义了一个相对稳定的关系，这表明在未来的帕卡亚火山危机期间，可以近实时估算熔岩排放速率。

著录项

  • 作者

    Morgan, Hilary A.;

  • 作者单位

    Michigan Technological University.;

  • 授予单位 Michigan Technological University.;
  • 学科 Geology.;Remote Sensing.
  • 学位 M.S.
  • 年度 2012
  • 页码 80 p.
  • 总页数 80
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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