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DSQ水管倾斜仪和SS-Y伸缩仪观测条件建设要点

本文以辽宁省铁岭地震台DSQ水管倾斜仪和SS－Y伸缩仪观测条件建设实践为基础，运用设计规范理论指导工作实践，对山洞基岩基础施工、仪器岩石礅的布设安装、礅面水平处理以及防水、密封等各施工步骤、方法作了较详尽的论述。其中仪器礅面水平处理和防水、密封等操作方法略有独到之处。     

Resolving the Geometry of Hydraulic Fractures from Tilt Measurements

This paper discusses the resolution of geometrical characteristics of pressurized fractures from tiltmeter data. The quasi-static deformation and tilt field induced by such fractures can be modeled by superposition of displacement discontinuity (DD) singularities. Despite the relatively common use of such measurements to infer fracture characteristics, there is a widespread misunderstanding of what can be accurately determined, depending on the relative distance between the tiltmeter array and the fracture. We investigate in detail the resolution of the dimensions and orientation of hydraulic fractures or faults from tilt measurements. In particular, we formally prove that at a distance larger than about twice the characteristic length of the fracture, elastostatic measurements such as those measured by tiltmeters are not able to resolve independently all the dimensions of the fracture, although the fracture volume can be robustly inverted from the data. The resolution of fracture orientation is also discussed using an analysis based on a spatial Fourier Transform of the tilt field. The relative angle between the plane where the measurements are located and the fracture plane plays a major role in the accuracy of this estimation. In an illustrative field example, where the measurements are located in the far-field of the fracture deformation field, we show how a single DD singularity can be used to model tiltmeter data and efficiently obtain the fracture orientation and volume.     

水平摆倾斜仪的便携式石英系统

介绍一种可以携整体更换的水平摆倾斜仪的石英系统，便于台站对损坏的ＳＱ、ＳＳＱ型倾斜仪摆系的修复。此外，还介绍了摆的悬挂点和摆的初始平衡位置对仪器稳定性的作用。     

楚雄水管倾斜仪观测的倾斜变化特征

1983年至1985年楚雄水管倾斜仪观测表明:楚雄地区的地壳表层是向东南方向倾斜的,与云南西部的红河断裂和哀牢山褶皱带的走向是一致的;楚雄台的台基是不均匀的,它表现在观测结果受外界干扰大和潮汐分析结果有方向性;地表观测与山洞(覆盖约30米)内观测的结果不能很好地符合,它表现在地表观测的倾斜方向规律性不好和干扰大于山洞内的观测。     

青海玛多MS7.4地震安西站VP宽频带倾斜仪数据特征分析

青海玛多M_S7.4地震前甘肃省安西县地震监测站VP宽频带倾斜仪出现明显异常变化且记录到该地震的同震波形。结合CTS-1地震计进行融合分析可知,2套仪器同震波形的震相到时基本同步,表明2套仪器具有可靠性和一致性,但震相记录特征存在差异。2021-04-17 VP宽频带倾斜仪数据打破原有倾斜趋势,年变向西北方向倾斜,05-13恢复为向西南方向倾斜,震前记录到倾角急剧增大的方位与震中至台站的方位一致,倾斜旋转变化方向与区域构造应力方向一致。在同时段时均值数据时频谱中,异常时段存在（1.085~4.340）×10^-6 Hz(周期为64~128 h)的低频信号。此次地震中2套仪器的优势频率和时频变化特征存在显著差异,这种差异可能与2套仪器不同的机械结构、频段宽度、采样频率有关。     

垂直摆倾斜仪灵敏度标定方法研究

采用精度高达4.8×10-8rad的自准直仪作为倾斜标定基准,我们首次提出并实现了利用压电陶瓷(PZT)和自准直仪联合标定高精度垂直摆倾斜仪的方法。这是一种直接标定方法,并综合利用了PZT和自准直仪的优点:PZT直接让倾斜仪产生一个倾斜变化,同时用自准直仪直接测量这一倾斜变化又克服了PZT压电系数不准确的缺点。与间接标定方法相比,由于减少了中间参数的转换,因而其标定结果更加可信。     

甘肃宕昌形变台水管倾斜仪观测资料分析及映震能力初步研究

分析了甘肃宕昌形变台 Ｆ Ｓ Ｑ 型自记水管倾斜仪１９９０ ～１９９８ 年的观测资料．分析结果表明：其潮汐响应函数的测量精度达到了观测规范的要求．水文与气象因素对观测资料有明显影响．该台资料对发生在台站附近的４ 级左右地震有一定程度的短临异常显示;对发生在较远处的中强地震有趋势异常显示     

水平摆倾斜仪配电系统的改造

水平摆倾斜仪配电系统在洞内放置,因洞内潮湿,仪器零部件锈蚀严重,经常发生故障,严重影响资料的连续率。本文提出将配电盘移出山洞,到办公室工作,计算和试验,完成了对赤城地震台的线路改造。仪器运行两年来,情况良好,彻底解决了十几年来一直困扰赤城台倾斜仪故障频繁的问题。