Abstract: The study area on the North West Coast of Oman Sea in Shoor and Parak estuaries is located within the city limits Chabahar. The GPR and seismic profiles in order to prepare and investigate the effects of subsurface and all is done. Identification of shallow subsurface structures material and thickness of the different are due to the contrast in electrical properties such as electrical conductivity and can pass including targets that are GPR detection methods are available. In this study the GPR profiles were taken with Mala GPR model. In order to calibrate the seismic data with characteristics facies obtained using a Euger involves two cores to lengths of 4.35 and 5 m were prepared. The data from these two methods were compared and the conclusions. The study showed that the cores are composed of two sedimentary facies. The first facies set includes mud with brown color and gravelly sandy mud facies with brownish cream color that the sedimentary environment is supratidal and the second facies set consists of muddy sand, gravelly mud and slightly gravelly sandy mud with gray color that specificities are related to depositional environment intertidal. Profile of the Shoor estuary defines four distinct facies that they are consistent with the core facies show up the upper facies set in the environment are supratidal and in the northeast of the South West on their thickness increases. The lower facies set environments intertidal formed that of the northeast toward the South West their thickness is unchanged. Profile of the Parak estuary defines two distinct facies that they are consistent with the core facies show up the upper facies set in the environment are supratidal that of the northeast toward the South West their thickness increases. The lower facies environments intertidal formed that of the northeast toward the South West their thickness does not change much. Since, the profile GPR No. 73 and 74 was nearer to the sea and influence the saltwater sea on penetration depth GPR is higher, detection of subsurface structures is less effective and two layers of subsurface has been identified in the parak estuary, but in Shoor estuary (the profile GPR No. 71 and 72), high distance from the sea and influence the saltwater sea on penetration depth GPR is less and detection of subsurface structures is better that has leading to the identification of four layers of subsurface. On the other hand comparison of sediment cores and GPR profiles with curve changes in global sea levels show that During two-Interval from time 2100 to 2800 years ago and so from time 4900 to 5800 years ago, increased sedimentation and sedimentation rates higher than average (0.1 mm per year) respectively. Finally, using GPR profile and cores, sea level changes in coastal environments can be revealed. These changes indicate that the two sedimentary cycles includes of a rise and fall sea level locally in the North West estuaries of Oman Sea in connection with the tectonic situation in the region. Keywords: Core, electrical conductivity, parak, penetrating radar, shoor INTRODUCTION An estuary is a semi-enclosed coastal body of water having a free connection with the open sea and containing a measurable quantity of sea water (Cameron and Pritchard, 1963). Estuaries form a transition zone between river environments and ocean environments and are subject to

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