...
  • 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 >Morphometry of scoria cones located on a volcano flank: A case study from Mt. Etna (Italy), based on high-resolution LiDAR data
【24h】

Morphometry of scoria cones located on a volcano flank: A case study from Mt. Etna (Italy), based on high-resolution LiDAR data

机译：位于火山腹侧面的鳞状锥的形态：以山为例。埃特纳火山（意大利），基于高分辨率LiDAR数据

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

By using new high-resolution (2 m) digital elevation model derived from the 2005 LiDAR survey of Mt. Etna volcano (Italy), our study measured the classical morphometrical parameters for scoria cones, i.e. W_(co) (cone width), W_(cr) (crater diameter), H (cone height) as well as volume, inclination of cone slope and substrate, and a number of other parameters for 135 scoria cones of Mt. Etna. Volume and age distribution of cones shows that there is no direct structural control on their emplacement in terms of Etna's rift zones. The cones are progressively smaller in size toward summit, which can be explained by the large volcano's feeding system and progressively frequent lava burial toward top.rnA careful analysis of H/W_(co) ratio (determined as 0.18 for other volcanic fields worldwide) shows that this ratio strongly depends on (1) the calculation method of H and (2) lava burial of cone. For Etnean cones, applying an improved method for calculating H relative to the dipping substrate results in a significantly lowered standard H/W_(co) ratio (0.137), which in turn questions the validity of the classical value of 0.18 in the case of large central volcanoes. The reduction of the ratio is not only due to methodology but also to the common lava burial. This can be expressed even better if H_(mean) is used instead of H_(max) (H_(mean)/W_(co) = 0.098). Using this measure, at Etna, well formed cones have higher ratios than structurally deformed (e. g. double or rifted) cones.rnFurthermore, although the sampled scoria cones at Etna have formed in a relatively narrow time interval (<6500 yrs BP), there is a slight decrease in H/W_(co) corresponding to erosional changes detected globally (H/ W_(co) = 0.143, 0.135 and 0.115 for three age classes of Etna's scoria cones, corresponding to average slopes of 26.6, 23.9 and 23.7°). Because the morphometrical effect of position on a dipping substrate as well as lava burial exceeds the effect of erosion, we call attention to use caution in simply using the H/W_(co) ratio of scoria cones for detecting age, especially on large active volcanoes.
机译：通过使用新的高分辨率（2 m）数字高程模型，该模型取自2005年LiDAR的Mt山调查。埃特纳火山（意大利），我们的研究测量了熔渣锥的经典形态学参数，即W_（co）（圆锥宽度），W_（cr）（火山口直径），H（圆锥高度）以及体积，圆锥斜率和衬底，以及135个火山锥的其他一些参数。埃特纳火山。视锥细胞的体积和年龄分布表明，就埃特纳火山裂谷区而言，视锥细胞的放置没有直接的结构控制。锥体向山顶逐渐变小，这可以用大型火山的进给系统和向顶部逐渐频繁的熔岩掩埋来解释。仔细分析H / W_（co）比（全球其他火山场确定为0.18）表明该比率在很大程度上取决于（1）H的计算方法和（2）圆锥体的熔岩埋葬。对于Etnean圆锥体，应用改进的方法来计算相对于浸渍基材的H会导致标准H / W_（co）比（0.137）大大降低，这反过来又质疑大值情况下经典值0.18的有效性中央火山。该比率的降低不仅是由于方法的原因，而且还归因于普通的熔岩埋葬。如果使用H_（mean）代替H_（max）（H_（mean）/ W_（co）= 0.098），则可以更好地表示这一点。使用此措施，在埃特纳火山，形成良好的圆锥体比在结构上变形（例如，双重或裂口）的圆锥体具有更高的比率。此外，尽管在埃特纳火山的采样的火山灰圆锥体形成的时间间隔相对较短（<6500 yrs BP）， H / W_（co）略有下降，对应于全球检测到的侵蚀变化（三个年龄级别的埃特纳火山灰锥的H / W_（co）= 0.143、0.135和0.115，对应于26.6、23.9和23.7°的平均斜率） 。由于位置在浸没基质上的形态计量学效果以及熔岩埋葬都超过了侵蚀作用，因此，在简单地使用粪锥的H / W_（co）比来检测年龄（特别是在大型活火山上）时，我们要提请注意。

著录项

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