کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9531120 | 1638495 | 2005 | 15 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of changing stress states on the development of caldera-bounding faults: Geological evidence from Kumano caldera, Japan
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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
The computed stress ratio Ï characterizes a pair of stress fields. In the early stage, the stress field with Ïâ¼1.0 shows a semi-radial trajectory of stress Ï2 and an eastern concentric trajectory of stress Ï3. This stress regime, resulting from pre-collapse tumescence, counteracts the gravitational force and thus produces smaller net vertical stress. The regional tumescence above an inflated magma chamber is the most plausible source of the stress field, and it is consistent with the timing of the caldera formation. In the late stage, the stress field with Ïâ¼0.5 shows the semi-radial trajectory of stress Ï2 and the west-convex and concentric trajectory of stress Ï3. Change of the stress ratio Ï from 1.0 to 0.5 implies that increase in the relative magnitude of the stress Ï1 caused the deeper subsidence of the caldera floor. Stress variations may be of significant value for reconstructing the structural history of the caldera.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Volcanology and Geothermal Research - Volume 144, Issues 1â4, 15 June 2005, Pages 89-103
Journal: Journal of Volcanology and Geothermal Research - Volume 144, Issues 1â4, 15 June 2005, Pages 89-103
نویسندگان
Daisuke Miura,