Changes in permeability of the Nojima fault damage zone inferred from repeated water injection experiments

Earth, Planets and Space

Table 2 Macroscopic parameters of the fault fracture zone estimated by numerical calculations and fracture aperture widths calculated by assuming a simplified model with a single open fracture

Injection	Macroscopic parameters of the fault fracture zone							Single open fracture model
Injection	S _s (1/m)	Lower limit of D (m²/s)	Upper limit of D (m²/s)	Central value of K (m/s)	Error of K (m/s)	Ratio to 1997—3rd	Error of ratio	Aperture (mm)	Error of aperture (mm)
1997—3rd	2.5E−06	0.7	1.2	2.3750E−06	6.2500E−07	1.0000	0.2632	0.522	0.047
2000—2nd and 3rd	2.5E−06	0.53	0.78	1.6375E−06	3.1250E−07	0.6895	0.1316	0.463	0.030
2000—4th	2.5E−06	0.56	0.65	1.5125E−06	1.1250E−07	0.6368	0.0474	0.452	0.011
2003—1st	2.5E−06	0.39	0.45	1.0500E−06	7.5000E−08	0.4421	0.0316	0.401	0.010
2004—1st	2.5E−06	0.48	0.54	1.2750E−06	7.5000E−08	0.5368	0.0316	0.427	0.008
2006—1st	2.5E−06	0.57	0.62	1.4875E−06	6.2500E−08	0.6263	0.0263	0.450	0.006
2006—2nd	2.5E−06	0.56	0.59	1.4375E−06	3.7500E−08	0.6053	0.0158	0.445	0.004