Accurate Method for Picking Up the First Arrival Time of Microseismic Signals Based on Entropy Theory

Table 5

Pickup time error of different parameters when R = 1.7

	T2
T1	20 ms	30 ms	40 ms	60 ms
5 ms	1.3	1.1	1.8	4.2
10 ms	1.6	1.4	1.2	3.5
15 ms	2.1	1.6	1.3	1.2