• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Lava delta deformation as a proxy for submarine slope instability
【24h】

Lava delta deformation as a proxy for submarine slope instability

机译：熔岩三角洲变形为潜艇坡度不稳定的代理

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

The instability of lava deltas is a recurrent phenomenon affecting volcanic islands, which can potentially cause secondary events such as littoral explosions (due to interactions between hot lava and seawater) and tsunamis. It has been shown that Interferometric Synthetic Aperture Radar (InSAR) is a powerful technique to forecast the collapse of newly emplaced lava deltas. This work goes further, demonstrating that the monitoring of lava deltas is a successful strategy by which to observe the long-term deformation of subaerial-submarine landslide systems on unstable volcanic flanks. In this paper, displacement measurements derived from Synthetic Aperture Radar (SAR) imagery were used to detect lava delta instability at Stromboli volcano (Italy). Recent flank eruptions (2002-2003, 2007 and 2014) affected the Sciara del Fuoco (SdF) depression, created a "stacked" lava delta, which overlies a pre-existing scar produced by a submarine-subaerial tsunamigenic landslide that occurred on 30 December 2002. Space-borne X-band COSMO-SkyMED (CSK) and C-band SENTINEL-1A (SNT) SAR data collected between February 2010 and October 2016 were processed using the SqueeSAR algorithm. The obtained ground displacement maps revealed the differential ground motion of the lava delta in both CSK and SNT datasets, identifying a stable area (characterized by less than 2 mm/y in both datasets) within the northern sector of the SdF and an unstable area (characterized by velocity fields on the order of 30 mm/y and 160 mm/y in the CSK and SNT datasets, respectively) in the central sector of the SdF. The slope stability of the offshore part of the SdF, as reconstructed based on a recently performed multibeam bathymetric survey, was evaluated using a 3D Limit Equilibrium Method (LEM). In all the simulations, Factor of Safety (F) values between 0.9 and 1.1 always characterized the submarine slope between the coastline and -250 m a.s.l. The critical surfaces for all the search volumes corresponded to
机译：熔岩Deltas的不稳定性是影响火山群岛的经常性现象，这可能导致沿海爆炸等次要事件（由于热熔岩和海水之间的相互作用）和海啸。已经表明，干涉性合成孔径雷达（INSAR）是预测新燃烧的熔岩Deltas崩溃的强大技术。这项工作进一步走得进一步，表明对熔岩增德拉斯的监测是一种成功的策略，可以观察到不稳定的火山侧面的Suberial-潜水滑坡系统的长期变形。在本文中，源自合成孔径雷达（SAR）图像的位移测量用于检测Stromboli火山（意大利）的Lava Delta不稳定性。最近的侧翼爆发（2002-2003,2007和2014）影响了Sciara del Fuoco（SDF）抑郁症，创建了一个“堆积的”熔岩三角洲，它覆盖了由12月30日发生的潜艇 - 丘疹的海啸滑坡生产的预先存在的疤痕2002年2月2010年2月和2016年2月至2016年10月之间收集的空间X场Cosmo-Skymed（CSK）和C-BAND Sentinel-1A（SNT）SAR数据。使用CHIMESAR算法处理。所获得的地位移图揭示了CSK和SNT数据集中的熔岩δ的差分接地运动，识别SDF北部扇区内的稳定区域（在两个数据集中的少于2mm /毫米）（以不稳定的区域）（在SDF的中央扇区中分别在CSK和SNT数据集中为30mm / y和160 mm / y的速度字段。使用3D限制平衡方法（LEM）评估基于最近进行的MuliBeam碱基测量的SDF的近距离部分的斜坡稳定性。在所有模拟中，0.9和1.1之间的安全系数（F）值始终以海岸线和-250 m A.L.L之间的潜艇斜率表征为潜艇斜率。所有搜索卷的临界表面对应于

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