| 琼北射气岩浆喷发力学机制探讨 |
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| 引用本文： | 孙谦,樊祺诚.琼北射气岩浆喷发力学机制探讨[J].地震地质,2005,27(1):63-72. |
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| 作者姓名： | 孙谦 樊祺诚 |
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| 作者单位： | 中国地震局地质研究所,北京,100029 |
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| 基金项目： | 国家自然科学基金;中国地质大学校科研和教改项目;中国地震局地质研究所项目 |
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| 摘 要： | 琼北第四纪火山区分布着为数众多、大小不一的射气岩浆喷发成因的低平火山口。上升的岩浆遇到地下水会发生射气岩浆喷发,形成地表出露的低平火山口,并伴随出现基浪堆积物。根据低平火山口的半径、爆炸发生时上覆地层的厚度、岩浆与地下水接触面的半径等参数,运用弹性力学基本原理建立了简单的喷发模型,初步模拟爆破冲击力与上述各参数之间的关系和变化规律,并计算出上覆地层中任一点的应力状态,初次探讨了射气岩浆喷发的力学机制
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| 关 键 词： | 琼北 第四纪火山 射气岩浆喷发 力学模型 |
| 文章编号： | 0253-4967(2005)01-0063-10 |
| 修稿时间： | 2003年12月18 |
DYNAMIC MECHANISM OF PHREATOMAGMATIC ERUPTION IN NORTHERN HAINAN ISLAND |
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| SUN Qian,FAN Qi-cheng.DYNAMIC MECHANISM OF PHREATOMAGMATIC ERUPTION IN NORTHERN HAINAN ISLAND[J].Seismology and Geology,2005,27(1):63-72. |
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| Authors: | SUN Qian FAN Qi-cheng |
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| Abstract: | Maars of various scales produced by phreatomagmatic eruption are widely distributed in the Quaternary volcanic region of the Northern Hainan Island. The Pleistocene volcanic activity in Northern Hainan Island was characterized by the alternating of effluent magma eruption and phreatomagmatic eruption. In fact, phreatomagmatic eruption was concentrated in Middle Pleistocene to Upper Pleistocene, resulting in a lot of maars of various sizes, such as Longfeng-Longji, Shuangchiling, and Yanghua maars etc. In |
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| Keywords: | Northern Hainan Island Quaternary volcanoes phreatomagmatic eruption dynamic mechanism |
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