We have developed a rod-type creepmeter in 1998. This creepmeter is designed for measuring the relative movement across well-defined active faults on the surface. This rod-type creepmeter is designed by a working group of active tectonics, including:

　

        Jian-Cheng Lee, Institute of Earth Sciences, Academia Sinica, Taiwan

        Jacques Angelier, Observatoire Océanologique de Villefranche, Géosciences Azur, France

        Fu-Shu Jeng, Dept. Civil Engineering, National Taiwan University

        Hao-Tsu Chu, Central Geological Survey, Taiwan

        Jyr-Ching Hu, Dept. Geosciences, National Taiwan University

　

　

The rod-type creepmeter, 5-6 meters long, measures displacements between two anchored piers on the opposite sides across the active fault. The piers were mounted on 60cm ´ 60cm wide concrete bases. While located on the soil surface, an extra 0.5 m deep cavity was dug for each pier and filled with pebbles, concrete, and iron bars, which were implanted more than 1 m deep. The instrument itself is composed of two parallel Invar rods, which are attached to each pier via a universal connector and are supported by the rollers fixed on a U-shaped steel cover-and -support system. The relative movement of two invar rods can be measured by a mechanical dial-gauge sensor. The resolution of the dial-gauge is 0.01 mm with a range of 50 mm. 

　       　       

　

　

　

　

　

Creepmeter CHIH004 was installed across surface breaks of the Chihshang fault on the retaining wall of a water channel near the Chinyuan Village.

　

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Site map of creepmeters and Creep data of the Chihshang Fault, eastern Taiwan

Creep data

    Tapo site

    Chinyuan Site

 

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References

Lee, J.C., Jeng, F.S., Chu, H.T., Angelier, J. and Hu, J.C., 2000. A rod-type creepmeter for measurement of displacement in active fault zone: Earth, Planets, and Space, 52, 5, 321-328.  [Full Text (PDF) 11.1MB]

Angelier, J., Chu, H.T., Lee, J.C., and Hu, J.C., 2000. Active faulting and earthquake risk: the Chihshang Fault case, Taiwan: Jour. Geodynamics, 29, 151-185.  [Full Text (PDF) 943K]

 Lee, J.C., Angelier, J., Chu, H.T., Hu, J.C., and Jeng, F.S., 2001. Continuous monitoring of an active fault in a plate suture zone: a creepmeter study of the Chihshang active fault, eastern Taiwan, Tectonophysics, 333, 219-240.   [Full Text (PDF) 3.1MB]

Lee, J.C., Chu, H.T., Angelier, J., Hu, J.C., Yu, S.B., Chen, H.Y., Jeng, F.S. Lin, C.H., Rau, R.J., Chow, J.D., Chang, S.H., and Jiang, G.C., 2002. Crustal deformation and Active faulting in relation with seismic hazard: Study of the active Chihshang fault in Longitudinal Valley , eastern Taiwan (in Chinese). Ti-Chih, 21, 2, 31-52. [Full Text (PDF 1.8MB]

Lee, J.C., Angelier, J., Chu, H.T., Hu, J.C., Jeng, F.S. and Rau, R.J., 2003. Active Fault Creep Variations at Chihshang, Taiwan, Revealed by Creepmeter Monitoring, 1998-2001. Journal of Geophysical Research, 108, B11, 2528, doi:10.10129/2003JB002394.  [Full Text (PDF)11.2MB]