鲁阿佩胡火山下方的地震异型性:可能的喷发预测工具
Alexander Gerst1, Martha K Savage
1Institute of Geophysics, School of Earth Sciences, Victoria University of Wellington, New Zealand. publications@planet3.de
Science (New York, N.Y.)
|November 30, 2004
概括
鲁阿佩胡火山的火山爆发显著改变了地震异构的方向. 这些与岩活动相关的地压力的变化表明了火山监测和喷发预测的新方法.
科学领域:
- 地质物理学 地质物理学
- 火山学 火山学是一门学科.
- 地震学 地震学
背景情况:
- 火山爆发可以引起火山地下应力场的显著变化.
- 地震异构性,即地震波速度的方向依赖性,对地压力敏感.
- 新西兰的鲁阿佩胡火山有着大量喷发和岩石活动的历史.
研究的目的:
- 为了研究火山爆发对卢阿佩胡火山地地震异性质的影响.
- 评估地震异性变化的潜力,作为对火山压力的监测技术.
- 探索使用这些变化用于中期火山爆发预测的可能性.
主要方法:
- 在1994年,1998年和2002年使用地震计部署测量了地震异质性.
- 快速的异构方向被用作地压力的现场测量.
- 分析的重点是1995-1996年爆发前后的异构性方向变化.
主要成果:
- 地的地震异质性取向至少两次改变了80度.
- 在1995-1996年爆发后,观察到一个显著的应力方向变化.
- 2002年的测量表明,部分恢复到爆发前的压力状态.
结论:
- 火山爆发,特别是与堤相关的岩活动,可能会导致地压力的实质性和快速变化.
- 地震异构度测量为监测火山下面的应力变化提供了有价值的工具.
- 这些发现支持开发用于中期喷发预测的新技术.
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