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  • 池上斷層-潛變儀 Chihshang Fault


In his last ten years of work of Taiwan, Professor Angelier had paid particular attention on studying the Chihshang Fault. The study had begun with a series of discovery of surface breaks of the creeping Chihshang Fault and the associated displacement-measurements since early 90s. Collaborated with Taiwanese colleagues, creep meters have been installed at Tapo School and Chinyuan channel sites and several local dense geodetic networks have been deployed annually since late 90s. Speculated on possible seasonal variation of fault slip from preliminary results of earlier measurements, Angelier started to measure the displacements of the fault twice per year (spring and autumn) since early 2000s until his last trip in 2009. His bold figure with a typical foreigner would then become a famous image for the local Chihshang people. Many habitants expected to see him to visit their rural country each year to 'measure the fault'.



Tapo School, Chihshang (2001)

Tapo elementary school has become a touristic spot for the Chihshang Fault, due to the 'famous slider' across the fault at the foot of the slope of a small hill. Tourists come here to see the 'fault slider". Students come here to look at the active faults explained by their teachers. Pictures of faults in Tapo School have been exposed in many international conferences worldwide. Angelier's sketch might provide us a gift to memorize his work in Tapo school.



Chinyuan site and Chihshang Fault (2001)

The Chinyuan site along the channel of the Chinyuan River is also an important observation site of the Chihshang Fault. Three fault-strands emerge onto surface to rupture the channel at a horizontal distance of about 100 m. During a geodetic survey in 2001, Angelier showed his super 3-D perspective vision and sketch skills to make this overview of the Chinyuan site.



Geodetic Network at Nanhai site, Chihshang(2001)

The Nanhai Tiandao site is an observation site for the Chihshang fault located between Tapo school and Chinyuan village. The fault runs sub-perpendicular to the cemented channel and caused ruptures in the channel. This site was monitored and measured since early 90s for about 20 years. Angelier called the site "Nanhai Tiandao", borrowed the name of a nearby Taoist temple, which always fascinated him with typical Asian decoration and style.



Surface ruptures on retaining wall, Chinyuan (2006)

Professor Anglier draw this sketch during the measurements of nail networks on the retaining walls, which he conducted regularly (once or twice a year) for about 20 years along the Chihshang Fault. This simple measurement came from the innovative idea of Angelier, in an attempt to quantify the displacement of the surface breaks of the rapid creeping Chihshang Fault. Data from repeated measurements in several years show a rather robust result by this easy original technique.