The movement of seawater under tidal force is causing periodic changes on the gravity and position (vertical and horizontal location) of points near the sea, which is known as tidal load effect in geometry and gravity spaces. Besides, the crustal deformation due to tidal load is the source of secondary effect to the gravity at the points near the sea due to the mass redistribution of the Earth. In this paper the aforementioned effects are studied under following two categories: (i) Crustal deformation due to tidal load. (ii) The change of gravity due to redistribution of the masses within the Earth. The used technique is the convolution of the ocean tide models with the Green functions of elastic response of the Earth crust. As the case study, the mentioned technique, is applied at 53 points along the Oman Sea and Persian Gulf at the southern coast of Iran, and the maps of co-range and co-phase of the radial deformations at those 53 points for 4 tidal components namely M2, S2, N2, and K2 based on 4 tide models, i.e. CSR4.0, FES99, GOT00.2, NAO99.b, are computed. According to the numerical results at the test points, maximum radial displacement is equal to 11 mm and is associated with the tidal component M2, and the maximum gravity change at the 53 coastal test points is 4 mGal, again due to M2 tidal component.
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