A Comprehensive Evaluation Model for Microseismic Source Location Reliability
Microseismic source location is mainly affected by source location methods, microseismic network, velocity model and arrival times, therefore, a single index may not get a comprehensive evaluation of the source location results. This paper presented a comprehensive evaluation model, which contains event residual index, sensitivity index and hit sequence index, to evaluate the microseismic source location reliability. First, the improved L1 norm statistical standard for source location was used to calculate the event residual. According to the ranges of the event residuals, the event residual index and its rating standard were determined, which can estimate the source location accuracy. Second, the stability of a solution was analyzed by the sensitivity index which was defined as the distance between a located source and its associated position by assuming different velocities. Third, based on the matching degree of the observed hit sequence and the calculated hit sequence, together with the microseismic network and the number of microseismic sensors, the hit sequence index was put forward. It can reflect not only the location accuracy but also the solution stability. Finally, the comprehensive evaluation model was built up by considering the above three evaluation indexes. In the end, the comprehensive evaluation model was checked by the field test. The results show that this model can evaluate the source location accuracy and stability comprehensively and effectively. The result of assessment can be used as a practical basis for the source location reliability of microseismic monitoring systems.
N. Li et al., "A Comprehensive Evaluation Model for Microseismic Source Location Reliability," Meitan Xuebao/Journal of the China Coal Society, Editorial Office of Journal of China Coal Society, Jan 2013.
Keywords and Phrases
Comprehensive Evaluation Model; Event Residual Index; Hit Sequence Index; Microseismic; Sensitivity Index; Source Location Reliability
Article - Journal
© 2013 Editorial Office of Journal of China Coal Society, All rights reserved.
01 Jan 2013