This study is done in order to obtain site effect and attenuation regarding the Arasbaran (Ahar-Varzaghan) Earthquake on August 11th, 2012 in Iran. The region has one of the highest levels of seismic hazard. However, there are no advanced studies in this area in order to obtain site effect and Q-factor. Thus, the main aim of this study is to figure out the site effect and amplification by using the spectral inversion method with respect to geological parameters on the region. We selected 35 events and 13 stations to estimate the site effect and Q-factor. ω-2 model was used to estimate source parameters such as the corner frequency (f0) and the seismic moment (M0). Eventually, we obtained Q = 45.85 f 1.495. Furthermore, the result shows high amplifications in Meshgin Shahr, Horand, Damirchi, Chaykandi, Khajeh and Kharvanagh. Although the reference site is not necessary, the usage of the reference events, especially the determination of the source parameters, can be quiet tough. It may be better to use a rock site or to conduct the geophysical exploration in sites where not so deep sediment is expected.