在日本东北部的地震间压力积累的季节性调节是由雪负荷驱动的
1Division of Earth Rotation, National Astronomical Observatory, 2-12 Hoshigaoka, Mizusawa, Iwate 023-0861, Japan. heki@miz.nao.ac.jp
概括
日本的季节性雪量大大取代了全球定位系统 (GPS) 站点,导致地面运动的年度变化. 这项研究量化了雪深对GPS测量的影响.
科学领域:
- 地质物理学 地质物理学
- 地质测量是指地质测量.
- 环境科学 环境科学
背景情况:
- 来自日本东北部的全球定位系统 (GPS) 数据显示,地点坐标每年有明显的周期变化.
- 这些变化包括最大弧度正常收缩和沉降,两者都在3月达到峰值.
- 日本东北部经历了大量的降雪,最高深度在3月达到几米.
研究的目的:
- 调查季节性雪量与日本东北部GPS站点观察到的年度移位之间的关系.
- 为了确定雪负荷对GPS数据周期性变化的程度.
主要方法:
- 观察到的雪深度与基于GPS数据估计的负载分布的比较.
- 分析来自连续GPS站点的时间序列数据.
主要成果:
- 由雪造成的表面负荷被发现是每年GPS站点迁移的主要原因.
- 雪荷重显著影响日本东北部的世俗应变积累的调节,这是由于太平洋板块的沉降造成的.
结论:
- 季节性积雪和融化是日本东北部GPS数据中观察到的年度垂直和水平移动的主要驱动因素.
- 虽然雪量会影响压力积累,但其在季节性地震发生模式中的确切作用仍然是一个开放的问题,需要进一步调查.
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