| dc.description.abstract | The Chutung gravity low is the northwest in the Taiwan anomaly map (Yen et al., 1995). We can exclude artificial observation error form the Hsinchu Bouguer anomaly map(Chang, 1972) which is the result of gravity surveyed by Chinese Petroleum Corporation (CPC) in 1960s. The area is the boundary of inter and outer foothills belt, there are many complex structures in this area. The oil and gas had found in the Chingtsaohu anticline, Chutung anticline. There are many folds and faults structures in Hsinchu area, they are Hsinchu fault, Hsincheng fault, Chutung fault, Peipu fault, Juanchiao fault, Chingtsaohu anticline, Kantzechi syncline, Paoshan anticline, Chutung anticline, Taping anticline. The folds and faults have very close relationship. The gravity low is relation with the subsurface formation density and location between Kuanhsi and Chutung area. The study selects the geology models from Yang et al., 2002 to build the initiate models. With the gravity data, the low area exist the west Paoshan anticline to the east Juanchiao fault. In the gravity low area, the Paoshan anticline to the Peipu fault gravity low area arises from the Toukoshan formation, but the Peipu fault to the Juanchiao fault gravity low area could be arose by the complex structures in this area. The Toukoshan formation is about depth 1.5 km, and the gravity curve is great fitting that have a lot of logging and seismic data in the west part of the gravity low. The broken formation could be the cause of the east part of the gravity low but the gravity curve is bad fitting. The east part of the gravity low, the initiate model could be correction. If we can have the others data from seismic and logging in the east of the Peipu fault, we can find the better result in this study. | en_US |