...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Rapid topographic change measured by high-resolution satellite radar at Soufriere Hills Volcano, Montserrat, 2008-2010
【24h】

Rapid topographic change measured by high-resolution satellite radar at Soufriere Hills Volcano, Montserrat, 2008-2010

机译：2008-2010年在蒙特塞拉特Soufriere Hills Volcano用高分辨率卫星雷达测量的快速地形变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High-resolution satellite radar observations of erupting volcanoes can yield valuable information on rapidly changing deposits and geomorphology. Using the TerraSAR-X (TSX) radar with a spatial resolution of about 2 m and a repeat interval of 11 days, we show how a variety of techniques were used to record some of the eruptive history of the Soufriere Hills Volcano, Montserrat between July 2008 and February 2010. After a 15-month pause in lava dome growth, a vulcanian explosion occurred on 28 July 2008 from a vent that was hidden by dense cloud. We were able to show the civil authorities using TSX difference images of surface roughness change that this explosion had not disrupted the dome sufficiently to warrant continuation of a previous, precautionary evacuation. Change difference images also proved to be valuable in mapping new pyrodastic flow deposits: the valley-occupying block-and-ash component tended to increase backscatter and the marginal surge deposits to reduce it, with the pattern reversing after the event due to erosion and deposition. By comparing east- and west-looking images acquired 12 h apart, the deposition of some individual pyrodastic flows can be inferred from change differences. Some of the narrow upper sections of valleys draining the volcano received many tens of metres of rockfall and pyrodastic flow deposits over periods of a few weeks. By measuring the changing radar shadows cast by these valleys in TSX images the changing depth of infill by deposits could be estimated. In addition to using the amplitude data from the radar images we also used their phase information within the InSAR technique to calculate the topography during a period of no surface activity. This enabled areas of transient topography, crucial for directing future flows, to be captured.
机译：对喷发火山的高分辨率卫星雷达观测可以提供有关快速变化的沉积物和地貌的有价值的信息。使用空间分辨率约为2 m且重复间隔为11天的TerraSAR-X（TSX）雷达，我们展示了如何使用各种技术来记录7月之间蒙特塞拉特Soufriere Hills火山的一些喷发历史。 2008年和2010年2月。在熔岩穹顶生长停顿了15个月之后，2008年7月28日在一个被密云遮盖的通风口发生了一次火山爆发。我们能够使用表面粗糙度变化的TSX差异图像向民政部门表明，这次爆炸并没有充分破坏圆顶，不能保证继续进行先前的预防性撤离。变化差异图像也被证明对绘制新的火山岩流沉积物很有价值：山谷占据的块状和灰分成分往往会增加反向散射，而边缘涌动沉积物会减少反向散射，并且由于侵蚀和沉积而在事件发生后反转。通过比较相隔12小时采集的东视和西视图像，可以从变化差异中推断出一些单独的热流体流的沉积。在数周的时间内，一些排入火山口的狭窄山谷上部收到了数十米的落石和火山岩流沉积物。通过测量由TSX图像中这些谷所投射的变化的雷达阴影，可以估算出沉积物的填充深度变化。除了使用来自雷达图像的振幅数据外，我们还在InSAR技术中使用了它们的相位信息来计算无表面活动期间的地形。这样就可以捕获对于引导未来流量至关重要的瞬态地形区域。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2011年第2期|p.142-152|共11页
  • 作者

    G. Wadge; P. Cole; A. Stinton; J.-C. Komorowski; R. Stewart; A.C. Toombs; Y. Legendre;

  • 作者单位

    Environmental Systems Science Centre, NCEO, University of Reading, Reading, UK;

    Montserrat Volcano Observatory, Flemmings, Montserrat Seismic Research Centre, University of the West Indies, Trinidad and Tobago;

    Montserrat Volcano Observatory, Flemmings, Montserrat Seismic Research Centre, University of the West Indies, Trinidad and Tobago;

    Montserrat Volcano Observatory, Flemmings, Montserrat Institute de Physique du Clobe de Paris, UMR CNRS 7154, University of Paris 7 Rene Diderot, Paris, France;

    Montserrat Volcano Observatory, Flemmings, Montserrat Seismic Research Centre, University of the West Indies, Trinidad and Tobago;

    Environmental Systems Science Centre, NCEO, University of Reading, Reading, UK;

    Institute de Physique du Clobe de Paris, UMR CNRS 7154, University of Paris 7 Rene Diderot, Paris, France;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Satellite radar images; topographic change; pyrodastic flow deposits; change detection; insar;

    机译：卫星雷达图像;地形变化;发热流沉积物;变化检测;insar;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号