Study of seasonal variation of groundwater and atmospheric loads : Possible influence on seismicity and astrometry

地下水和大气负荷季节性变化的研究:对地震活动和天体测量的可能影响

基本信息

项目摘要

We quantitatively evaluated various factors governing the seasonal components in the position time series of the Japanese nationwide GPS network (GEONET). We found that seasonal changes of surface loads in the Japanese Islands are responsible for seasonal changes. Among them, the snow loads are several times as large as other kinds of loads. Atmospheric loads, groundwater loads (soil moisture and empoundment in reservoirs), non-tidal ocean loads were found to be of secondary importance. We estimated the seasonal changes of these loads using meteorological data and models, and calculated expected seasonal crustal deformation, compared them with actually observed deformations. We found that, in addition to these load changes, significant contributions come from the apparent changes associatedd with seasonal scale changes of unknown origin and atmospheric delay gradients. We established empirical seasonal change models considering all these factors, and the seasonal changes predicted by these models were consistent with actual GPS data. Seasonal components have been removed by an adaptive method, i.e. by estimating annual and biannual components using least-squares method in order to isolate transient crustal deformation signals. Our investigation showed that removal of seasonal components using our model based on a priori knowledge (non-adaptive correction) gives rise to as good results as the adaptive method. Our results were published in the book "State of the Planet" (AGU Geophysical Monograph Series Vol.150). We also calculated the Coulomb Failure Stress caused by such seasonal loads and found they have some influence on the inland seismicity in Japan. It has been known that there are more earthquakes in spring/summer than in fall/winter in snow covered regions, which is consistent with our prediction. This was reported as a paper in Earth Planet.Sci.Lett., and was introduced by major scientific journal s such as Nature and New Scientist.
我们定量评估了各种因素的季节性成分的位置时间序列的日本全国GPS网络(GEONET)。我们发现,在日本列岛的表面负荷的季节变化是负责的季节变化。其中,雪荷载是其他类型荷载的数倍。大气负荷、地下水负荷(土壤水分和水库的淤积)、非潮汐海洋负荷被认为是次要的。利用气象资料和模型估算了这些负荷的季节变化,并计算了预期的季节地壳形变,与实际观测的形变进行了比较。我们发现,除了这些负载的变化,显着的贡献来自与季节尺度变化的未知来源和大气延迟梯度的明显变化。建立了综合考虑这些因素的季节变化经验模型,模型预测的季节变化与实际GPS数据相吻合。季节性成分已被删除的自适应方法,即通过估计的年度和半年的成分,使用最小二乘法,以隔离瞬态地壳形变信号。我们的调查表明,使用我们的模型基于先验知识(非自适应校正)的季节性成分的去除产生了良好的效果,自适应方法。我们的研究结果发表在《地球状态》一书中(AGU地球物理专题丛书第150卷)。本文还计算了这种季节性荷载引起的库仑破裂应力,发现它们对日本内陆地震活动有一定的影响。在冰雪覆盖的地区,春、夏两季的地震比秋、冬两季多,这与我们的预测是一致的。这篇论文发表在《地球科学与文学》上,并被《自然》和《新科学家》等主要科学杂志介绍。

项目成果

期刊论文数量(20)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Dense Gps Array as a New Sensor of Seasonal Changes of Surface Loads
  • DOI:
    10.1029/150gm15
  • 发表时间:
    2013-04
  • 期刊:
  • 影响因子:
    0
  • 作者:
    K. Heki
  • 通讯作者:
    K. Heki
Heki, K.: "Dence GPS Array as a New Sensor of Seasonal Changes of Surface Loads"アメリカ地球物理連合モノグラフ,"The State of the Planet"(未定). (2004)
Heki, K.:“Dence GPS 阵列作为表面负荷季节性变化的新型传感器”美国地球物理联盟专着,“地球状况”(TBD) (2004)。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
朝日選書「地球が丸いって本当ですか?」
Asahi Sensho “地球是圆的吗?”
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    大久保;里村;飛田;日置
  • 通讯作者:
    日置
Secular, transient and seasonal crustal movements in Japan from a dense GPS array : implication for plate dynamics in convergent boundaries
来自密集 GPS 阵列的日本长期、瞬态和季节性地壳运动:对收敛边界的板块动力学的影响
Dense GPS Array as a New Sensor of Seasonal Changes of Surface
密集 GPS 阵列作为地表季节变化的新型传感器
  • DOI:
  • 发表时间:
    2004
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Heki;K.
  • 通讯作者:
    K.
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HEKI Kosuke其他文献

HEKI Kosuke的其他文献

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{{ truncateString('HEKI Kosuke', 18)}}的其他基金

Exploration of non-standard applications of dense GPS arrays
密集GPS阵列非标应用探索
  • 批准号:
    23540485
  • 财政年份:
    2011
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Interdisciplinary earth science from time-variable gravity
来自时变重力的跨学科地球科学
  • 批准号:
    20540402
  • 财政年份:
    2008
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Identification of the Mechanisms of the Seasonal Crustal Deformation
季节性地壳变形机制的识别
  • 批准号:
    13640430
  • 财政年份:
    2001
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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Preservation of fruit tree branch under various mechanical stress including snow load
果树枝在包括雪荷载在内的各种机械应力下的保存
  • 批准号:
    18KT0058
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    2018
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Proposal of seismic performance evaluation method for spatial structure considering snow load
考虑雪荷载的空间结构抗震性能评价方法的提出
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    16K06571
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    2016
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Resolution of Collapse Mechanism of Timber Space Frames Subjected to Excessive Snow Load and Practical Formulation to Predict their Critical Performance.
过量雪荷载作用下木空间框架倒塌机制的解析及预测其关键性能的实用公式。
  • 批准号:
    11555156
  • 财政年份:
    1999
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study on Snow Load on long span structure
大跨度结构雪荷载研究
  • 批准号:
    08650680
  • 财政年份:
    1996
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Study on control of snow load on roof
屋面雪荷载控制研究
  • 批准号:
    05650541
  • 财政年份:
    1993
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Failure characteristics of Reinforced Concrete Cylindrical Shells subjected to Partial Snow Load
部分雪荷载作用下钢筋混凝土圆柱壳的破坏特性
  • 批准号:
    03650466
  • 财政年份:
    1991
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    $ 0.9万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Comparison of Control Experiments with Field Case Studies- Testing Snow Load Parameters
控制实验与现场案例研究的比较 - 测试雪荷载参数
  • 批准号:
    8512766
  • 财政年份:
    1986
  • 资助金额:
    $ 0.9万
  • 项目类别:
    Continuing Grant
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