| Popis: |
Cisadane Fault is one of the growing faults in Jakarta, which is a surface fracture that becomes a stream water and has northwest-southeast heading. Since 1945 to 2018, 29 earthquakes occured in radius of 25 km from the Cisadane faults, without any scientific evidence to prove it. In this study, nine continuous geodetic observations provided by BPN and BIG were used to determine the activity of Cisadane fault. The result showed that the total horizontal displacement rate every station moves to the southeast with a magnitude about 2 centimeters per year and the vertical displacement rates are varying between 0.22 and 25.44 millimeters per year. After removing the Sunda Block effect, the displacement of each station is random especially the horizontal residual rate, which have magnitude between 0.51 and 3.14 millimeters per year. The BJA0 and BKS1 stations move to the southeast, CRKS, BTGR, and JKTS stations move to the southwest; also TGRK, CJKT, CBTU, and BAKO stations move to the northwest. The uplift motions appear in CBTU, CRKS and BAKO stations and the downlift motion occurred in BTGR, BJA0, JKTS, BKS1, and CJKT stations. Surprisingly, TGRK station has a significant uplift displacement rate although its station is located around JMR and at northern back-thrust of Baribis Fault. It might be caused by the uplift activity of Cisadane fault. |
