概括
在1983年的地震之后,长谷火山口的变形放缓了. 地测测量显示延伸率降低,表明火山活动减少和潜在的岩注入.
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.
- 地质测量是指地质测量.
背景情况:
- 长谷火山口在1983年1月经历了显著的地震性.
- 后地震变形,特别是在南沟和复苏的圆顶,是显著的.
- 了解正在进行的变形对于评估火山风险至关重要.
研究的目的:
- 为量化1983年地震群之后长谷火山口的变形速度.
- 分析地面运动的空间和时间模式.
- 为了建模导致观察到的变形的地下过程.
主要方法:
- 在地理测量网络中进行了重复的双色激光测距测量.
- 数据收集时间从1983年6月到1984年11月.
- 分析了基线延伸和剪切变形.
主要成果:
- 从1983年中期到1984年中期,基线延长率 (2-3倍) 显著下降.
- 面积扩张是占主导地位的变形信号,在1983年夏天达到5ppm/年的峰值率.
- 剪切变形也被确定在南沟内.
结论:
- 观察到的变形表明,1983年地震活动后火山动荡的速度正在下降.
- 变形模式与在复苏的圆顶下面的浅岩注入一致.
- 在南的浅,垂直断层上的右侧滑动也导致了变形.
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