Recovering Seismic Displacements from Underground Strong-Motion Acceleration Records of the 2011 MW9.0 Tohoku Earthquake in Japan

被引:0
|
作者
Li, Heng [1 ]
Zheng, Shuiming [1 ]
Song, Chen [1 ]
Feng, Qian [1 ]
机构
[1] China Earthquake Adm, Inst Seismol, Key Lab Earthquake Geodesy, Wuhan 430071, Peoples R China
来源
关键词
underground strong-motion; baseline correction; ground tilt; seismic displacement; BASE-LINE CORRECTIONS; 1999; CHI-CHI; DIGITAL ACCELEROGRAPH; RESPONSE SPECTRA; TAIWAN; EXAMPLES; TILT;
D O I
10.4028/www.scientific.net/AMR.671-674.1418
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
The borehole strong-motion (SM) records from the 2011 MW9.0 Tohoku earthquake are analyzed, and we find ground tilt is the main error source of the SM records. The assumption is made that the time in when ground tilt fluctuates tempestuously (transient tilt) can be determined by the vertical velocity time-series. Then, we propose a two-step algorithm to correct these errors, which involves fitting a straight line to the tail portion of velocity for permanent tilt and average error processing of the transient tilt and noises caused by it. The transient tilt is unknown, but its final influence can be estimated as the velocity at the time when strong shaking ceased. The horizontal accelerograms are corrected and the displacements are obtained by double integration. Comparing with the GPS data, seismic displacements can be recovered by the corrected underground SM acceleration records.
引用
收藏
页码:1418 / 1422
页数:5
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