Survei Pendahuluan Deformasi Sesar Kaligarang Dengan Pengamatan GPS

Kaligarang Fault is an active fault shear which located in a river valley of Kaligarang. Kaligarang River divides the area of Semarang on the direction nearly north - south. In the Tertiary, Kaligarang Fault is a fault moves horizontally quarter turn to the right while at the time the fault is activated again as the fault moves horizontally left. According to geological research Kaligarang Fault directed north – south that extends to the east of Semarang cut the Quaternary sediments results of Merapi and Merbabu Volcano to the base of Java Sea in the north of Semarang. For the purposes of fault activity information then made a planning of the installation monitoring points of GPS measurements by using geodetic static methods. The research method that used is using a dual frequency GPS observations on 14 points mounted transverse direction of Fault Kaligarang by using Gamit 10.5 Scientific Software for data processing. The purpose of this research is made a planning of network point design to monitoring the fault deformation of Kaligarang by using GPS monitoring and take the first control point of Kaligarang fault deformation measurements carefully by using GPS dual frequency tools with scientific devices Gamit 10.5. Scientefic Software for data processing. The purpose of this research such as the design of network control point plan for monitoring deformation Fault Kaligarang with GPS observations and take the first control point observations carefully on Kaligarang Fault deformation using GPS dual frequency measurement tools with scientific devices Gamit 10.5. Literature review which used in this research include the dynamics of the earth's structure, fault, Fault Kaligarang, deformation, GPS, Data RINEX, ITRF of Gamit. The implementation conducted on the point of planning of monitoring methods, collection of data, and analysis of GPS data. The results of this study showed on the second strategies by means of monitoring points tied BAKO station, COCO, DARW, of PIMO have an average standard deviation of X = 0.02741 m; Y = 0.01185 m; Z = 0.06000 m. So the final conclusion of this research is the measurement by using dual frequency GPS in order to obtain more precise results it must be tied to stations which categorized as IGS more