尖度解析と最尤推定法を組み合せた微小地震のP波入力時刻自動検出法

概要

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An automatic detection algorithm of P-wave arrival time for a microearthquake is described. A function based on normalized fourth-order cumulant, kurtosis, is used to detect both provisional P-wave arrival time and the end of microseismic signal. The contrast function has the maximum value near the P-wave arrival time. After detection of the provisional P-wavearrival time, maximum likelihood analysis is applied to evaluate residuals between microseismic signal and its AR model, whichis made based on the provisional P-wave arrival time. 100 of microseismic events are used to examine the performance of thisautomatic detection. Errors of the automatic detection are within 3 ms in the 97 events. 3 ms is as long as a quarter of a period ofP-wave because dominant frequency of P-wave is 80Hz.
2007-10-25