سال انتشار: ۱۳۸۴

محل انتشار: دوازدهمین کنفرانس ژئوفیزیک

تعداد صفحات: ۷

نویسنده(ها):

احمد سدیدخوی – دانشجوی مقطع دکتری زلزله شناسی موسسه ژئوفیزیک دانشگاه تهران
غلام جوان دولویی – استادیار زلزله شناسی پژوهشگاه بین المللی زلزله شناسی و مهندسی زلزل
محمدرضا قیطانچی – دانشیار زلزله شناسی موسسه ژئوفیزیک

چکیده:

Although there can be up to ٢١ independent elastic constants, any material in which more than two are needed is called anisotropy. More than two elastic constants means that the material’s properties differ depending on the direction. Seismic wave through anisotropic materials travel faster or slower depend on their direction. The shear wave can be spitted into two pulses, each with a different polarity and travel at a different speed. This phenomenon is called shear wave splitting. Shear wave splitting of different shear phases can be applied to determine the anisotropy parameters. Also, different shear velocities (fast and slow) of Ps phase on horizontal components of Receiver function can interpret the physical description of anisotropy phenomenon. In this paper, we attempt to automate the choice of analysis window by performing a grid search over different windows to find stable splitting measurements with minimum error. Finally, for determining anisotropy in the crust under centeral Alborz, we use ٤ events where recorded by DAMV seismic broad band station. In this study we find out the fast direction of hear wave velocity is about ٧٠ degree and its delay time is about ٠٫٣٣ second.