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Multiple Attenuation using radon filtering is commonly used for suppressing multiple energy technique at seismic data. The basic concept is to do separation between primary and multiple in radon domain by using residual moveout value. The method is used for synthetic seismic data called GM1 as marine precipitation zone. The data is found multiple, dominantly as peg-leg multiple. The study is being done in order to know how much radon filtering can influence both for Common Mid Point (CMP) stack and Common Reflection Surface (CRS) stack to attenuate multiple. The imaging of CRS stack is expected will be able to create higher signal to noise ratio than conventional method. Radon filtering is applied to CMP gather and CRS supergather. Radon analysis can't able to reduce peg-leg multiple overall in CMP gather and CRS supergather. Signal to noise ratio of stacking section can be enhanced by CRS stack method significantly. [ABSTRACT FROM AUTHOR]

Rocks and minerals that exist on earth have electrical properties such as: natural electric potential, electrical conductivity, and dielectric constant. There are various methods used to determine the conditions below the ground surface. One of them is the geoelectric method. This method can be used as a way to investigate the electrical properties of the earth through the response captured from the ground in the form of potential difference, electric current, and electromagnetic field. The resistivity or resistivity geoelectric method is one type of geoelectrical method used to study subsurface conditions by studying the nature of electric currents in subsurface rocks of the earth. Based on the research objectives, the resistivity method is divided into two, namely mapping and sounding. The resistivity method by mapping uses the Wenner configuration, while the resistivity method by sounding uses the Schulmberger configuration. Geoelectric resistivity mapping method is a resistivity method that aims to study the horizontal variation of the resistivity of the subsurface layer. While the resistivity sounding method aims to study variations in the resistivity of the subsurface layers of the earth vertically. The resistivity method by mapping uses the Wenner configuration, while the resistivity method by sounding uses the Schulmberger configuration. With this geoelectric study, it is hoped that it can become a reference for the feasibility study of the Samarinda tunnel which has an impact on the efficiency and effectiveness of tunnel construction, both in terms of cost and construction time. [ABSTRACT FROM AUTHOR]

In the hydrological cycle, there is a water circulation process starting from evatranspiration, condensation, precipitation followed by run-off, infiltration and percolation. From this cycle it is known that water changes form startingfrom a liquid, solid and vapor. In the hydrogeological process, it is the process of obtaining groundwater which will produce groundwater basins. Hydrodynamics can be defined as the science that studies the motion of liquids or the motion of liquid fluids, especially the motion of water. The hydrodynamics of groundwater flow in the Subang groundwater basin in the form of lateral flow is regional flow and is an interbasin flow, where the Subang Groundwater Basin is related to the Non Groundwater Basin area which contains rock formations that act as a fissure medium. Where the groundwater flow pattern of the wells and the location of the springs found in the Non Groundwater Basin Zone indicates the direction of subsurface flow is to flow laterally to the Subang Groundwater Basin. By delineating the watertable (groundwater level), deep groundwater (bore well) and shallow watertable (dug wells and springs) in the Subang Groundwater Basin, it can be seen that the equal position of the watertable at the same location between dug wells and wells is in one aquifer system. the same one. In addition, several areas within the Subang Groundwater Basin are known to be able to absorb local and local water, especially in unconfined aquifer systems which are characterized by the similarity of the watertable positions of dug wells and drilled wells. The role of rock formations capable of absorbing water (infiltration), is also a reference for delineating the recharge zone of the Subang Groundwater Basin. [ABSTRACT FROM AUTHOR]