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Abstract
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Seismic waves contain important information about the Earth's crust. This is due to the influence of crustal structure on wave propagation. The analysis of seismic waves contributes significantly to a better understanding of the crust and the seismicity of a region. Calculation of the moment tensor based on the seismic data is one of the physical methods to analyze an earthquake. The moment tensor of an earthquake represents both its fault geometry (via different components) and its size (via the scalar moment). Also each component of the tensor represents the dynamic effect in a particular direction. The seismic moment tensor can decompose in several ways to analyze the earthquake source mechanism. In this study we calculated the seismic moment tensors using the seismic data of the events with M ?5, occurred in the Central Zagros (CZ). We decomposed each diagonolized tensor into two parts; Isotropic (Iso) and Deviatoric (M’). To evaluate the contribution of each component in seismic source, we further decomposed M into a best Double Couple (DC) and Compensated Linear Vector Dipole (CLVD) components. We found for some events with more than fifty percent of misfit between M, and a pure DC, ?, which show that the CLVD contribution was dominated. It seems there is a good agreement with geology phenomenon, such as active anticline, active salt domes, fault links, fault tips, and also might be curved fault surface in the region as the local effect where the CLVD is dominant.
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