Effect of Initiation Location within Blasthole on Blast Vibration Field and Its Mechanism

Table 4

Measured PPVs in the single-hole blasting experiment.

Sensor no.	PPV (cm/s)
	Blasthole I	Blasthole II	Blasthole III	Blasthole IV
#1	18.37	32.50	14.51	—
#2	19.21	34.40	11.09	21.47
#3	19.33	27.55	7.92	14.07
#4
Radial	0.27	0.40	0.27	—
Tangential	0.13	0.20	0.13	—
Vertical	0.25	0.34	0.25	—