کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6439587 | 1638311 | 2016 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magma chamber recharging and tectonic influence on reservoirs: The 1986 eruption of Izu-Oshima
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
ژئوشیمی و پترولوژی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Although analytical expressions for deformation due to simple reservoirs and planar dikes have been in use for decades, seldom are there sufficient data to provide well-constrained detailed models of volcanic activity. Deformation due to the eruption of Miharayama, Izu-Oshima, Japan, in November 1986 was captured by a wider array of monitoring than usual at that time. Here we show that the first eruptive stage requires a shallow non-spherical source, extended perpendicular to the axis of maximum tectonic tension, together with a deeper reservoir. The shallow reservoir was partially recharged, from a deeper reservoir, during the eruption, with a magma ascent rate of ~Â 10Â km/day; this has important implications for estimation of reservoir gas content. Precursory changes starting 2Â h before the second phase require dike propagation from at least 10Â km depth. Surface elevation changes are indicative of a long sub-surface dike. A model incorporating dikes and a deep (10Â km) reservoir, extended in the same direction as the dikes, provides a very good match to the data. Such reservoir geometry may explain why the eruption was unexpected.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 311, 1 February 2016, Pages 72-78
Journal: Journal of Volcanology and Geothermal Research - Volume 311, 1 February 2016, Pages 72-78
نویسندگان
Alan T. Linde, Osamu Kamigaichi, Masaaki Churei, Kenji Kanjo, Selwyn Sacks,