...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Volcanology and Geothermal Research >Some Regularity In The Process Of Re-awakening Of Andesite And Dacite Volcanoes: Specific Features Of The 1982 El Chichon Volcano, Mexico Reactivation
【24h】

Some Regularity In The Process Of Re-awakening Of Andesite And Dacite Volcanoes: Specific Features Of The 1982 El Chichon Volcano, Mexico Reactivation

机译：安山岩和达克特火山再唤醒过程中的一些规律性：1982年墨西哥El Chichon火山重新活化的特殊特征

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

El Chichon volcano is an andesite stratovolcano in southern Mexico. It erupted in March 1982, after about 550 years of quiescence. The 1982 eruption of El Chichon has not been followed by the growth of a lava dome within the newly formed crater. This is rather anomalous since the construction of a new dome after the destruction of an old one is a common process during the eruptions at andesite and dacite volcanoes. To discuss this anomalous aspect of the El Chichon eruption, some regularity in the process of re-awakening of dormant (here defined as a period of quiescence of more than 100 years) andesite and dacite volcanoes are studied based on the seismic activity recorded at the volcanoes Bezymianny, Mount St. Helens, El Chichon, Unzen, Pinatubo and Soufriere Hills. Three stages were identified in the re-awakening activity of these volcanoes: (1) preliminary seismic activity, leading up to the first phreatic explosion; (2) activity between the first and the largest explosions; (3) post-explosion dome-building process. The eruptions were divided into two groups: low-VEI (Volcanic Explosivity Index) and the long duration stage-1 events (Unzen, 1991 and Soufriere Hills volcano, 1995) and high-VEI and the short duration stage-1 events (Bezymianny, 1956; Mount St. Helens, 1980; El Chichon, 1982 and Pinatubo, 1992). The comparative analysis of the seismo-eruptive activity of two eruptions of the second group, the 1980 of Mt. St. Helens and the 1982 of El Chichon, produced an explanation the absence of new dome building during the 1982 eruption of El Chichon volcano. It may be explained in terms of the unusually rapid emission of gas and water from the magmatic and hydrothermal system beneath the volcano during a relatively short sequence of large explosions that could have sharply increased the viscosity of the magma making impossible its exit to the surface.
机译：El Chichon火山是墨西哥南部的安山岩层状火山。经过约550年的沉寂，它于1982年3月爆发。 1982年的El Chichon火山喷发并未在新形成的火山口内形成熔岩穹顶。这是非常反常的，因为在安第斯山和达克特火山喷发期间，在破坏旧圆顶之后建造新圆顶是一个常见的过程。为了讨论El Chichon火山喷发的这一异常方面，根据记录在地震记录上的地震活动，研究了安山岩和da榴石火山的重新唤醒过程（此处定义为静止期超过100年）的一些规律性。 Bezymianny火山，St。Helens山，El Chichon，Unzen，Pinatubo和Soufriere Hills火山。这些火山的重新唤醒活动分为三个阶段：（1）初步地震活动，导致第一次潜水。 （2）第一次和最大爆炸之间的活动； （3）爆炸后圆顶的建造过程。火山喷发分为两类：低VEI（火山爆发指数）和持续时间长的第一阶段事件（Unzen，1991； Soufriere Hills volcano，1995）；高VEI和短期持续时间的第一阶段事件（Bezymianny， 1956年；圣海伦斯山（Mount St. Helens），1980年； 1982年El Chichon和1992年Pinatubo）。对第二组两次火山爆发的地震爆发活动的比较分析，1980年。圣海伦斯（St. Helens）和1982年的奇琴（El Chichon）提出了一个解释，认为在1982年的奇琴（El Chichon）火山喷发期间没有新的圆顶建筑。可以用相对短的大爆炸序列从火山下面的岩浆和热液系统中异常迅速地释放出气体和水来解释，这可能会急剧增加岩浆的粘度，从而使岩浆不可能逸出地面。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号