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Laterally constrained inversion of surface wave data at Najaf city (Iraq) |
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| Institution: | 1. State key laboratory of nuclear resources and environment, East China University of Technology, Nanchang 330013, Jiangxi, China;2. Technical Innovation Center of Coverage Area Deep Resources Exploration, Ministry of Natural Resources, Hefei 230001, China;3. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring Ministry of Education, School of Geoscience and Infophysics, Central South University, Changsha 410083, China;1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Chengdu University of Technology, Chengdu 610059, Sichuan, China;2. College of Geophysics, Chengdu University of Technology, Chengdu 610059, Sichuan, China;1. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China;2. The Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China |
| Abstract: | A case history is reported to outline a possible strategy for the construction of a pseudo-2D model of shear-wave velocity for seismic site response studies. Experimental data have been collected using the Multichannel Analysis of Surface Wave technique (MASW) at six sites in the city of Najaf (Southern Iraq). The sites are aligned along the route of a proposed subway. The dataset has been processed to extract the dispersion curves of each site and then it has been inverted by using a Laterally Constrained Inversion (LCI) algorithm. The initial model for the local search algorithm has been obtained with a preliminary Monte Carlo Inversion (MCI). A priori information from borehole logs and lateral constraints between neighbors 1D models are used to mitigate the non-uniqueness of the solution. The result is a pseudo-2D shear-wave velocity model of the area which is in good agreement with sediment lithology and thicknesses obtained from borehole logs. |
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