Detection of Coseismic Changes of Underground Water Level
Detection of Coseismic Changes of Underground Water Level
复制标题
地下水位同震变化检测
DOI：
10.1080/01621459.1996.10476917
复制
发表时间：
1996
影响因子：
3.7
通讯作者：
N. Matsumoto
中科院分区：
文献类型：
--
作者：
G. Kitagawa;N. Matsumoto
摘要分析了日本观测最集中的地区之一东海地区10年来定期观测的地下水位数据集。首先，使用非高斯状态空间模型对500，000+点数据集进行平滑，以插入缺失的观测值并校正离群观测值。利用状态空间模型估计了气压、固体潮和降水对水位的影响。在减去这些影响后，16个检验地震的同震效应是清楚的。同震效应的量被解释为地震的震级和震源距离的函数。研究还表明，地下水位有每年增加约6厘米的趋势。据推测，这与该地区由于菲律宾海构造板块向欧亚板块俯冲而导致的应变增加相对应。
Abstract An underground water level data set, regularly observed over a 10-year period in the Tokai area, one of the most intensively observed areas in Japan, is analyzed. First, the 500,000+ point data set was smoothed using a non-Gaussian state-space model to interpolate missing observations and to correct outlying observations. Then the effects of barometric pressure, earth tide, and precipitation on the water level were estimated using state-space modeling. After subtracting these effects, the coseismic effects on 16 examined earthquakes are clear. The amount of the coseismic effect is explained as a function of magnitude and hypocentral distance of the earthquake. It is also shown that the underground water level had a tendency to increase approximately 6 cm/year. Presumably, this corresponds to the increase of strain in this area due to the subduction of the Philippine Sea tectonic plate under the Eurasian plate.