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Information Journal Paper

Title

DETERMINATION OF STRESS DIRECTION IN THE CRUST OF CENTRAL ALBORZ USING SHEAR WAVE SPLITTING OF TELESEISMIC EARTHQUAKES

Pages

  1-12

Abstract

 All materials are anisotropic, Although there can be up to 21 independent elastic constants, any material in which more than two are needed is calledANISOTROPY. More than two elastic constants mean 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 splitted into two pulses, each with a different polarity and travel at a different speed.This phenomenon is calledshear wave splitting. SHEAR WAVE SPLITTING of different shear phases can be applied to determine the ANISOTROPY parameters.Parallel, aligned, fluid-filled cracks and microcracks can cause ANISOTROPY and may be sensitive indicators of stress. Thus, for vertically travelingS waves, j (fast direction) is parallel to the cracks and to the maximum principal stress direction. The fast wave speeds in such a medium are identical to those in the uncracked medium (the fast waves do not “see” the cracks.) In this paper, we attempt to automate the choice of analysis window by performing a grid search over different windows to find stable ANISOTROPY direction with minimum error.Finally, for determining ANISOTROPY direction in the crust of Alborz, we use some events where recorded by IIEES seismic broad band station (DAMV, THKV & CHTH). In this study we find out the fast direction of shear wave velocity.

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    APA: Copy

    SADID KHOUY, A., JAVAN DOLOEI, G., GHEITANCHI, M.R., & AKASHEH, B.. (2008). DETERMINATION OF STRESS DIRECTION IN THE CRUST OF CENTRAL ALBORZ USING SHEAR WAVE SPLITTING OF TELESEISMIC EARTHQUAKES. JOURNAL OF THE EARTH, 3(1), 1-12. SID. https://sid.ir/paper/193075/en

    Vancouver: Copy

    SADID KHOUY A., JAVAN DOLOEI G., GHEITANCHI M.R., AKASHEH B.. DETERMINATION OF STRESS DIRECTION IN THE CRUST OF CENTRAL ALBORZ USING SHEAR WAVE SPLITTING OF TELESEISMIC EARTHQUAKES. JOURNAL OF THE EARTH[Internet]. 2008;3(1):1-12. Available from: https://sid.ir/paper/193075/en

    IEEE: Copy

    A. SADID KHOUY, G. JAVAN DOLOEI, M.R. GHEITANCHI, and B. AKASHEH, “DETERMINATION OF STRESS DIRECTION IN THE CRUST OF CENTRAL ALBORZ USING SHEAR WAVE SPLITTING OF TELESEISMIC EARTHQUAKES,” JOURNAL OF THE EARTH, vol. 3, no. 1, pp. 1–12, 2008, [Online]. Available: https://sid.ir/paper/193075/en

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