厦门地震台数字化仪器零点台阶产生原因探讨

自使用数字化仪器观测以来，厦门地震台多套仪器的记录曲线均出现台阶现象，大部分出现在当日数据之间。也有一种台阶非常特殊，它出现在当日00h00m数据和昨日23h59m数据之间，称为“零点台阶”。本文对台阶产生的原因简单分析，重点对零点台阶出现的时间进行统计，试图寻找这种台阶的产生规律，讨论出现的可能原因。

Discussion on the cause of zero step of digital instruments in Xiamen Seismic Station

Since digital instruments have been used, the record curves of several apparatus in Xiamen Seismic Station had shown step phenomena. Most of them present in intra day data. There also exists an extraordinary sort of step, which appears between 00.00 of intra day and 23.59 of previous day, and called as zero steps. The cause of step is simply analyzed and emergence time of a zero step as the emphasis is counted. The rule of the origin of a zero step is studied and the possible cause is discussed.