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Determining the Source Time Function Using the Modified Matrix Method

Journal of Earth Science 2016年第6期27卷 1054-1059页

作者： anastasiia pavlova Carpatian Branch of Subbotin Institute of Geophysics of NAS of Ukraine Lviv 79060 Ukraine

The modified matrix method of construction of wavefield on the free surface of an anisotropic medium is proposed. The earthquake source represented by a randomly oriented force or a seismic moment tensor is placed on an arbitrary boundary of a layered anisotropic medium. The theory of the matrix propagator in a homogeneous anisotropic medium by introducing a ＂wave propagator＂ is presented. It is shown that the matrix propagator can be represented by a ＂wave propagator＂ in each layer for anisotropic layered medium. The matrix propagator P（z, z0=0） acts on the free surface of the layered medium and generates stress-displacement vector at depth z. The displacement field on the free surface of an anisotropic medium is obtained from the received system of equations considering the radiation condition and that the free surface is stressless. The new method determining source time function in anisotropic medium for three different types of seismic source is validated.

关键词： matrix method seismic tensor synthetic seismograms.

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Ways of Determining the Focal Mechanisms in the Carpathian Region of Ukraine

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Journal of Earth Science and Engineering 2014年第1期4卷 54-71页

作者： anastasiia pavlova Oksana Hrytsai and Dmytro Malytskyy Carpatian Branch of Subbotin Institute of Geophysics NAS of Ukraine Lviv 79060 Ukraine

The modification to the matrix method for constructing the displacement field on the free surface of an anisotropic layered medium was presented. The source of seismic waves was modelled by a randomly oriented force and seismic tensor. A trial and error method was presented for solving the inverse problem of determining parameters of the earthquake source. A number of analytical and numerical approaches to determining the earthquake source parameters, based on the direct problem solutions, were proposed. The focal mechanisms for the events in the Carpathian region of Ukraine are determined by the graphical method. The theory of determinating the angles of orientation of the fault plane and the earthquake＇s focal mechanism was presented. The focal mechanisms obtained by two different methods were compared.

关键词： Matrix method wave propagator anisotropy focal mechanism graphical method.

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