• 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 >Long period and very long period events at Mt. Etna volcano: Characteristics, variability and causality, and implications for their sources
【24h】

Long period and very long period events at Mt. Etna volcano: Characteristics, variability and causality, and implications for their sources

机译：富士山的长期和长期事件。埃特纳火山：特征，变异性和因果关系及其来源

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

Almost 50,000 long period (LP) events were recorded at Mt. Etna from November 2003 to May 2006. We analysed these events, as well as very long period (VLP) events which were associated with some of them. During some intervals the spectral and wavefield features of LP events remained steady, with significant changes occurring between the intervals. Based on the times of the changes, we distinguish five different sub-periods. In particular, during sub-period III (June-November 2005) the wavefield at the stations nearest to the summit area was composed of P waves. Locations for 150 LP events occurring in sub-period III, determined using radial semblance, changed, at the same time as the events' spectral features changed. It was during this sub-period that many of the LP events were associated with VLP events. Based on similarity of the waveforms, we distinguished two families of VLP events, with gradually evolving waveforms. The two families are located in slightly different places, but near the sources of the LP events. The change between the families occurred at the same time as the spectra of the LP events changed. Finally the source of the VLP events was investigated by performing complete waveform moment tensor inversion of stacks of the two families. Synthetic Green's functions for the full moment tensor were calculated for a homogeneous half-space. For both families, the source region with the highest variance reduction lies approximately beneath the active craters, at 500 m below the altitudes of the stations. The solutions for both families are very similar with sources that are between 60 and 70% isotropic. Attempts to determine deviatoric moment tensors produced consistently poorer fits. The remaining energy is poorly constrained and is likely to be noise. In conclusion, these results highlight changes in the LP and VLP events at Mt. Etna over time, and the causal relationship between them.
机译：记录了近50,000个长期（LP）事件。埃特纳火山（Etna）从2003年11月到2006年5月。我们分析了这些事件以及与其中一些事件相关的很长时间（VLP）事件。在某些时间间隔内，LP事件的频谱和波场特征保持稳定，在两个时间间隔之间发生了显着变化。根据变化的时间，我们区分了五个不同的子时期。特别是在第三阶段（2005年6月至11月），最靠近山顶区域的台站的波场由P波组成。在子时段III中发生的150个LP事件的位置（通过径向相似性确定）在更改事件频谱特征的同时进行了更改。正是在此子期间，许多LP事件与VLP事件相关联。基于波形的相似性，我们区分了两个VLP事件系列，它们的波形在逐渐发展。这两个家庭位于略有不同的地方，但是靠近LP事件的来源。家族之间的变化与LP事件光谱的变化同时发生。最后，通过执行两个族的堆栈的完整波形矩张量反转来研究VLP事件的来源。针对均匀半空间计算了全力矩张量的合成格林函数。对于这两个家庭，方差减少最大的源区大约位于活动火山口下方，在测站高度以下500 m。两个系列的解决方案与各向同性在60％到70％之间的光源非常相似。试图确定偏斜矩张量的一致性总是较差。剩余的能量约束较弱，很可能是噪音。总之，这些结果突出了山顶LP和VLP事件的变化。随着时间的流逝，埃特纳火山与它们之间的因果关系。

著录项

  • 来源
    《Journal of Volcanology and Geothermal Research》 |2009年第4期|227-234237-242245-249|共19页
  • 作者

    A. Cannata; M. Hellweg; G. Di Grazia; S. Ford; S. Alparone; S. Gresta; P. Montalto; D. Patane;

  • 作者单位

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    Berkeley Seismological Laboratory, University of California at Berkeley, Berkeley, CA, USA;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    Lawrence Livermore National Laboratory, Livermore, CA USA;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

    Dipartimento di Scienze Geologiche, Universita di Catania, Corso Italia 57, 95129 Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy Dipartimento di lngegneria Elettrica, Elettronica e dei Sistemi, Universita di Catania, Catania, Italy;

    Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania, Piazza Roma 2, 95123 Catania, Italy;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    LP and VLP events; source location; moment tensors; Mt. etna volcano;

    机译：LP和VLP事件;源位置;矩张量公吨。埃特纳火山;

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