| 长白山天池火山千年大喷发空降浮岩碎屑的形貌特征和最终沉降速度 |
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| 引用本文： | 于红梅,许建东,林传勇.长白山天池火山千年大喷发空降浮岩碎屑的形貌特征和最终沉降速度[J].地震地质,2011,33(2):440-451. |
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| 作者姓名： | 于红梅 许建东 林传勇 |
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| 作者单位： | 中国地震局地质研究所; |
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| 基金项目： | 国家自然科学基金(40972209); 地震行业科研专项(20070827)共同资助 |
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| 摘 要： | 碎屑的形貌参数是计算碎屑最终沉降速度公式中的一个重要参数,而以往在计算中只是把碎屑假设为球形或椭球形,未对其进行详细研究.通过对长白山天池火山千年大喷发产生的空降碎屑的形貌分析得到一些新的认识:空降碎屑以浮岩为主,浮岩碎屑的形态不规则,从等轴状到拉长状,从次圆状到棱角状都有.随着浮岩碎屑粒径的减小,颗粒拉长现象明显,拉...
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| 关 键 词： | 浮岩碎屑 形貌参数 最终沉降速度 扩散模型长 白山天池火山 |
| 收稿时间： | 2010-09-12 |
| 修稿时间： | 2010-11-22 |
MORPHOLOGICAL CHARACTERIZATION AND TERMINALVELOCITY OF PUMICE PARTICLES ERUPTED DURING THE MILLENNIUM ERUPTION OF CHANGBAISHA NTIANCHI VOLCANO,CHINA |
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| YU Hong-mei,XU Jian-dong,LIN Chuan-yong.MORPHOLOGICAL CHARACTERIZATION AND TERMINALVELOCITY OF PUMICE PARTICLES ERUPTED DURING THE MILLENNIUM ERUPTION OF CHANGBAISHA NTIANCHI VOLCANO,CHINA[J].Seismology and Geology,2011,33(2):440-451. |
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| Authors: | YU Hong-mei XU Jian-dong LIN Chuan-yong |
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| Institution: | YU Hong-mei XU Jian-dong LIN Chuan-yong(Institute of Geology,China Earthquake Administration,Beijing 100029,China) |
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| Abstract: | The shape parameter of particles is an important parameter in the formula of the terminal settling velocity,but it was usually assumed to be spherical or ellipsoidal without detailed study.According to the morphological characterization of the tephra particles erupted during the Millennium eruption of Changbaishan Tianchi volcano,we got some new recognition:The tephra particles consist mainly of pumice,which have irregular shapes,varying from very equant to elongate and from subrounded to angular.With decre... |
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| Keywords: | pumice particles shape parameters terminal settling velocity tephra dispersal model Changbaishan Tianchi volcano |
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