Research has been conducted on derivative analysis of gravity anomaly data and 2d modeling of the subsurface structure of the Cugenang fault area. The Meteorology Climatology and Geophysics Agency discovered a new fault in the West Java region called the Cugenang fault, which caused an earthquake in Cianjur on November 21, 2022, with a magnitude of 5.6 M. The earthquake event was caused by a local fault with a left shear fault mechanism. This study aims to understand the character of the fault, it is necessary to have a sustainable study that utilizes the gravity method. Earth’s gravity data is obtained from the GGMplus satellite image. Based on the value of the gravity anomaly, an analysis can be done to determine the presence and characteristics of the type of fault under the surface, namely derivative analysis. Based on the results of the First Horizontal Derivative (FHD) and Second Vertical Derivative (SVD) derivative analysis of 7 slices made, there is a suspected fault near the main earthquake. The fault is suspected to be the cause of the November 21, 2022 Cianjur earthquake. From the suspected fault, 2-dimensional modeling was made as many as 2 passes representing the presence of the suspected fault, and showing the subsurface geological model. The research area is located in 3 formations, namely chonical hills, mainly of basalt blocks formation (Qyc), breccia and lahar from Mt. Gede (Qyg), and oldest volcanic products breccisa, lava (Qot). The rock layers of the study area are composed of breccia and basalt.