کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8911311 | 1638267 | 2018 | 90 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Contrasting styles of post-caldera volcanism along the Main Ethiopian Rift: Implications for contemporary volcanic hazards
ترجمه فارسی عنوان
سبک های مخالف آتشفشانی پس از کلدرا در امتداد رودخانه اتیوپی اصلی: پیامدهای خطرات آتشفشانی معاصر
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
چکیده انگلیسی
Most central volcanoes in the MER host large mid-Pleistocene calderas, with typical diameters of 5-15Â km, and associated ignimbrites of trachyte and peralkaline rhyolite composition. In contrast, post-caldera activity at most centres comprises eruptions of peralkaline rhyolitic magmas as obsidian flows, domes and pumice cones. The frequency and magnitude of events varies between individual volcanoes. Some volcanoes have predominantly erupted obsidian lava flows in their most recent post-caldera stage (Fentale), whereas other have had up to 3 moderate-scale (VEI 3-4) explosive eruptions per millennium (Aluto). At some volcanoes we find evidence for multiple large explosive eruptions (Corbetti, Bora-Baricha, Boset-Bericha) which have deposited several centimetres to metres of pumice and ash in currently densely populated regions. This new overview has important implications when assessing the present-day volcanic hazard in this rapidly developing region.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 356, 1 May 2018, Pages 90-113
Journal: Journal of Volcanology and Geothermal Research - Volume 356, 1 May 2018, Pages 90-113
نویسندگان
Karen Fontijn, Keri McNamara, Amdemichael Zafu Tadesse, David M. Pyle, Firawalin Dessalegn, William Hutchison, Tamsin A. Mather, Gezahegn Yirgu,