| Borehole Tilt Observations of Xiangshan Station, Beijing, and Effects of Tilt Due to Fault Creeping |
| |
| 作者单位： | Department of Surveying Engineering，university of New Brunswick，PO Box 4400，Fredericton，NB，Canada E3B SA3
Institute for Geophysics，Technical University of Clausthal，Germany |
| |
| 摘 要： | An ASKANIA borehole tiltmeter which consists of a vertical pendulum with two degrees of freedom was installed in Xiangshan station,Beijing,in May 1989 in order to monitor the earthquake-reiated crustal deformations.The preliminary results indicate that the resolution of the instrument is better than 0.05 msec for tidal amplitudes.The daily total tidal amplitude is about 20 msec.The spectral analysis of the first four months data provides a signal-to-noise ratio of > 100 for the main semi-diurnal waves.The non-tidal tilts for one year data are dominated by a long term drift with the rate of 0.9 msec/day for X-component and 1.1 msec/day for Y-component.In addition,the tilt observations are affected by meteorological factors,especially by rainfall.The results of modelings of the fault-creep related tilts and responses of tilts to earthquakes suggest that the tilt measurements are very sensitive to the change in tectonic strain and stress fields near the site where the tiltmeter is installed.The fault-creep
|
| 本文献已被 CNKI 等数据库收录！ |
|
