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Abstract A new type of velocity model without the velocity inversion and velocity measuring was put forward for the improvement of the traditional simplex method based on the comprehensive analysis of the traditional simplex method，the velocity models and the related errors of the microseism locating method. Numerical analysis and engineering validation on the precision of locating under the conditions of different velocity models，different iteration algorithms with velocity errors and velocity anisotropy were carried out. The results show that the new velocity model can effectively avoid the errors happened in the process of velocity inversion and measuring and avoid the problem of local minimum in traditional simplex method. In comparison with the other iterative methods, significantly higher accuracy of locating the seismic sources outside the sensor arrays is achieved，taking advantage of the easy convergence of iterations of the simplex method.
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Received: 25 October 2013
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2014, Vol. 33 
