Aerogeophysical measurements of collapse-prone hydrothermally altered zones at Mount Rainier volcano
Aerogeophysical measurements of collapse-prone hydrothermally altered zones at Mount Rainier volcano
复制标题
雷尼尔山火山易塌陷热液蚀变区的航空地球物理测量
作者：
C. Finn;T. Sisson;M. Deszcz
新的机载电磁和磁力数据，结合详细的地质测绘，揭示了相当厚度的大部分被掩埋的蚀变岩主要位于雷尼尔山的上西侧，确定这是未来能够到达现在人口稠密地区的大型泥石流最有可能的来源。大部分的山顶，中央核心和火山的上东侧没有大量的软弱，高度蚀变的岩石，并且相对较低的崩溃风险。此外，火山核心缺乏高度蚀变的岩石可能会阻碍崩塌后退，并限制未来泥石流的体积和淹没区域。高分辨率的地球物理和地质观测产生了前所未有的看法，三维分布的顺时针蚀变岩石在雷尼尔山，并有潜在的应用到危险的火山世界各地。
New helicopter-borne electromagnetic and magnetic data, combined with detailedgeologic mapping, reveal that appreciable thicknesses of mostly buried altered rock liemainly in the upper west flank of Mount Rainier identifying this as the most likely sourcefor future large debris flows capable of reaching now densely-populated areas. Most of thesummit, central core and upper east side of the volcano are free of significant volumes ofweak, highly-altered rock and are at relatively lower risk of collapse. In addition, the lackof highly altered rock lies in the volcano's core may impede collapse retrogression and limitvolumes and inundation areas of future debris flows. High-resolution geophysical andgeologic observations yield an unprecedented view of the 3-D distribution of collapse-pronealtered rock at Mount Rainier, and have potential application to hazardous volcanoes worldwide.