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| | Abstract | | Surface based microseismic monitoring is an emerging technology in the last decade. The method observes acoustic emission (AE) / microseismic events using a surface receiver array and estimates locations and origin times of the events by analyzing a time series of migrated images. However, accuracy and monitoring cost of the technology highly depends on the array geometry. The migration images can be blurred if too coarse array is used. Monitoring cost can be unnecessarily high if too dense array is used. Some array evaluation methods are required for designing a cost effective survey plan. We introduce an array evaluation method based on the point-spread function (PSF). The PSF describes the response of an imaging system to a point source. Our proposed method evaluates an array in the following way: First, a point source which excitation time and source location are known is defined. Second, a synthetic data using the array is computed. Third, the data is migrated and a time series of source images are obtained. Finally, the images are examined so that abilities of the array are understood. We demonstrate the use of some display techniques those extract characteristics of the array. |
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