【摘要】 对十堰台的数字化水管仪2007—2010年倾斜潮汐观测资料进行全面质量评定后发现,运行3年以来的倾斜潮汐观测资料连续可靠,仪器工作正常稳定,零漂与年变幅等指标均在稳定范围内。长水管系列调和分析结果表明:倾斜潮汐观测在资料精确度、连续性和可用率3方面已接近国际同类水平,有些指标已超过国内优秀台站观测水平。倾斜资料于2009年3月曾因山洞附近土石开挖受到影响,出现高频微颤动和短时掉格下跃暂态事件,但固体潮汐很快恢复正常,排除地震前兆异常。同时在汶川8.0级地震前十堰台水管仪NS分量固体潮汐加卸载响应非潮汐比值显示有超出正常变化范围的波动现象。更多还原

【Abstract】 Tilt tide measurement data with digital water tube is collected at Hubei Shiyan seismostation from 2007-2010.The results of data analysis indicate that the tilt tide observation for 3 years werecontinuous and reliable,the instrument works normally and stably which has small annual zero drift and change amplitude and so it is with the low noise level.The overall quality nearly reach the international level in terms of data accuracy,continuity and applicability,though the data had been affected by the local station cave excavates in March,2009,which were high-frequency vibration and the short-time drift.The earth tide returned soon to regular level very approximately and this short-time Anomaly had been not believed firmly as an earthquake precusor.In the same time,it is revealed that in the tilt components evident signal occurs together with significant perturbations of load/unload-response-ratio(LURR) of earth tide before the Wenchuan M8.0 earthquakes.更多还原