Using eGPS to study surface deformation of the Chishan and Longchuan faults area after the 2016 Meinong earthquake

• Main Authors: Yu-ChunYeh, 葉宇淳
• Other Authors: Ruey-Juin Rau
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/wv9zph

碩士 === 國立成功大學 === 地球科學系碩士在職專班 === 107 === The Chishan fault and Longchuan fault have moved obviously in recent years, and the motion caused the deformation of the viaduct and the Jungliau tunnel. Geodetic data were collected about one year before and after the 2016 Meinong earthquake from 43 continuous GPS stations in southwestern Taiwan area. At Jungliau tunnel area, 7 points within a length of about 3.6 km were setup crossing the Longchuan fault and Chishan fault. Ten measurements with about once a week were surveyed by using e-GPS from January to April 2017 for understanding the horizontal and vertical velocity field of the study area. After the 2016 Meinong earthquake, crustal deformation of southwestern Taiwan increase to about over 50 mm/yr based on continuous GPS data. And the area between the Longchuan and Chishan faults, the crustal deformation here was larger than the other area. Except for possible lateral extrusion motion here, it might have the other forces contributing this motion. After the Meinong earthquake, the crustal deformation here also increased. At the same point, the horizontal velocity increased from 100 mm/yr to 115 mm/yr, the vertical velocity increased from 79 mm/yr to 141 mm/yr, about 180% larger. Jungliau tunnel area has no obvious crack on building and ground surface after the Meinong earthquake, so the growth of surface deformation might be caused by other forces like mud diapir.