摘要
针对气象因素对基岩观测标志稳定性的影响,利用垂直摆倾斜仪对黄梅和荆门的GNSS观测墩进行试验,发现观测墩在南北向和东西向上存在回归性的日偏移运动,南北向的偏移变化大于东西向。南北向的偏移日变幅度和偏移日均值多在3 mm和1 mm以内,东西向的偏移日变幅度和偏移日均值多在2 mm和0.2 mm以内,且季节变化不显著。研究表明,日照导致墩体的温差变化是观测墩发生偏移运动的主因,降雨、气压变化、地球固体潮等因素对观测标志稳定性没有显著影响。基岩观测墩的日偏移运动对精密地壳运动观测造成一定的影响,需对观测墩采取温度防护措施或采用热膨胀率较低的特殊设计。
The tests analyzing the influence of meteorological factors on the stability of bedrock observation marks were taken for GNSS observation pillars in Huangmei and Jingmen to researchby using vertical pendulum tilt- meter. The result indicates that a regression daily offset movement of the pillars in S-N direction and E-W direction, and a bigger offset in S-N over E-W direction. The maximum amplitude of the daily offsets and the daily average off- sets of the pillars in S-N direction is within 3 mm and 1 mm, respectively, within 2 mm and 0.2 mm in E-W direc- tion, and the influence of change of seasons on amplitude is not obvious. The main reason of the offset movements of the pillars is the changes of temperature difference caused by the sunshine. Also, there is no significant relationship between the stability of the observation marks and rainfall, air pressure, and solid tide. The influence of daily offset movement of the bedrock pillars on the high-precision observation reminds us to take temperature protection against the pillars, or to make pillars of the materils with lower thermal expansion rate.
出处
《大地测量与地球动力学》
CSCD
北大核心
2014年第4期165-171,共7页
Journal of Geodesy and Geodynamics
基金
地震行业科研专项(201208006
201308009)
关键词
精密地壳运动观测
观测标志稳定性
垂直摆倾斜仪
气象因素
日偏移
high-precision observation of crustal movement
stability of observation marks
vertical pendulum tihme- ter
meteorological factors
daily offset movement
