【摘要】 分析造成强震加速度记录基线漂移的可能原因,以东日本Mw9.0强震加速度记录为例,由于基线漂移的不确定性以及现有方法在处理日本Mw9.0强震数据的不适用性,提出基于Hermit插值,并以平整度为判别依据确定强震台站永久位移的基线校正方法,参考同震位移的相关数据对比各种方法的基线校正结果,同时选取汶川Ms8.0强震加速度记录进行验证。研究表明:①造成强震加速度记录基线漂移的可能原因比较复杂;②现有基线校正方法通用性不强;③基于Hermit插值的基线校正方法比较合理,拟合精度较高,适用于强震中永久位移的识别。更多还原

【Abstract】 The possible causes of baseline drift in strong motion acceleration records are analyzed.Taking Mw 9.0 Tohoku earthquake acceleration records as an example,due to the uncertainty of the baseline drift and the imperfect existing methods in the applicability of processing Japanese records,a suitable way based on the Hermit interpolation is introduced.And the flatness can be used to determine the permanent displacement,at the same time,results are compared with the coseismic displacement resulted from the GPS station nearby,which is also tested by Ms 8.0 Wenchuan earthquake acceleration records.It shows that: ① the possible reasons for baseline drift of acceleration records are complicated;② the existing baseline correction methods are not applicable for all records;③ it is reasonable to apply the new baseline correction method based on the Hermit interpolation in the permanent displacement identification,and the fitting accuracy is higher than other ways.更多还原