Seasonal modulation of interseismic strain buildup in northeastern Japan driven by snow leads

被引:117
作者
Heki, K [1 ]
机构
[1] Natl Astron Observ, Div Earth Rotat, Mizusawa, Iwate 0230861, Japan
关键词
D O I
10.1126/science.1061056
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Distinct periodic variations with annual frequencies are often found in the time series of continuous Global Positioning System (GPS) site coordinates in northeastern Japan, They show maximum are-normal contraction of a few millimeters as well as maximum subsidence of 1 to 2 centimeters, both in March, In northeastern Japan, it snows heavily on the western flank of the backbone range, attaining a maximum depth of several meters in March, When observed snow depths were compared with the Load distribution estimated from the CPS data, the surface loads caused by the snow were found to be largely responsible for the annual displacement of GPS sites, The snow load modulates secular strain buildup in northeastern Japan due to the Pacific Plate subduction, but its relevance to the seasonal change of earthquake occurrences remains uncertain.
引用
收藏
页码:89 / 92
页数:4
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