针对传统梯形积分方法的低精度缺陷,提出了一套高精度累积数值积分方法.首先对被积数据进行分段三次Hermite插值,之后采用积分区间四等分的Newton-Cotes积分公式进行积分.误差分析表明,本方法精度远高于梯形积分方法精度.在对构建信号进行方法验证的前提下,采用2013年4月20日雅安芦山地震和2008年5月12日汶川地震的真实强震动加速度记录对本方法进行测试,测试结果表明,本方法适用于将强震动加速度记录积分为位移记录.

This article introduces the construction of a comprehensive network in Tai’an Standard Seismic Station,which is an important component of “the Tenth Year Plan” of the station concerning reconstruction.The construction of the network has improved the station’s process of modernization and digitization.We hope the introduction can be of some reference to our counterparts in other stations.

Using Venidikov harmonic analysis method, the tidal parameters of digital volume strain of Shandong Province have been studied to find their deviations to the theoretical value and to get the characteristic values of each parameter in normal conditions. The running state of every station is evaluated combined with the analysis on the observed data of body strain. And the relation among the tidal parameters, such as tide factor and phase lag, as well as the lithology and the conditions of the boreholes is discussed in this paper.

Tai'an Seismic Station is the first to undergo the digitization in "the Ninth Five-Year Plan".The improvement includes the transformation of the already existing water pipe instrument,the addition of the pantograph,the digital horizontal pendulum and the vertical pendulum.Up to now the digitized transformation has already run for more than six years.This article makes a comparative study utilizing four instruments’ figures and simulation materials in terms of drift amount,tidal amplitude,record precision and annual variation curve,and draws a conclusion that the replacement of the simulation instruments by digital instruments is feasible.

收集整理了山东省数字化形变台自观测以来的固体潮分钟值资料,论述了气压、雷电、洞室进人、仪器故障及附加载荷等干扰因素对数字化形变高频记录的影响及其机理,为利用数字化资料及时识别干扰、准确捕捉短临地震异常提供了可借鉴的实例.

以观测条件及观测质量居全国前列的山东泰安台为例,对固体潮形变观测的数字化与模拟资料的一致性、精度等方面进行了对比研究,认为固体潮的数字化与模拟观测资料的形态、观测精度、方差及均值无显著差异.通过对潮汐因子中误差、相位滞后及仪器零漂等参量的计算,对山东、上海及江苏各套形变数字化仪器观测资料的连续性、稳定性及观测质量进行了综合分析.在数字化倾斜仪中,水管倾斜仪的稳定性及精度较高,石英摆存在一定程度的漂移,垂直摆倾斜仪的漂移较大且资料精度较低.伸缩仪也存在精度较低的情况,但数字化资料精度略高于模拟资料;压容及体应变仪资料精度较高,但压容仪漂移较大,仪器稳定性不及体应变仪;体应变仪受气压、水位影响较显著.山东各形变台观测资料总体质量较好,上海佘山、江苏常熟台次之,江苏徐州台较其它台受降雨干扰大、漂移大,资料的稳定性及精度较低,说明台址条件是决定观测质量的重要因素之一.