Estimating SiO₂ content of lava deposits in the humid tropics using remotely sensed imagery

详细信息    查看全文

• 作者：Cielo F. Bastero and Alfredo Mahar F.A. Lagmay
• 关键词：rheology ; silica content ; humid tropics ; hazards assessment ; remote sensing ; digital elevation models ; Bingham plastic
• 刊名：Journal of Volcanology and Geothermal Research
• 出版年：2006
• 出版时间：15 March 2006
• 年：2006
• 卷：151
• 期：4
• 页码：357-364
• 全文大小：593 K

文摘

Remote sensing methods used to determine the rheology and SiO₂ composition of lava flows on Mars were utilized to estimate the composition of lava deposits in the Philippines. Test cases were conducted on two lava domes and two lava flow deposits to determine whether remote sensing methods can be applied as a rapid and economical means to assess hazards associated with volcanoes in the humid tropics. Our study shows that dimensional parameters derived from digital elevation models (DEMs) generated from airborne sensors are effective in determining the SiO₂ content of lava deposits. The SiO₂ values computed from the rheological properties of lava are found to be comparable to geochemically analyzed field samples. These results suggest that remote sensing methods to estimate the composition of lava deposits is viable and can serve as a potentially useful tool for rapid and economic hazards assessment of volcanoes in tropical regions. With the growing number of high-resolution satellite sensors that routinely image the Earth's surface, such a technique can be widely utilized.