Deformation source revealed from leveling survey in Jigokudani valley, Tateyama volcano, Japan

Earth, Planets and Space

Table 1 Search range and step for the model parameters and their optimal values with uncertainties (square brackets) for a Poisson’s ratio of 0.45

Parameter	Range	Step	Optimal value
N–S location	− 1000–0 m	25 m	− 325 [− 325,− 325] m
E–W location	− 1000–0 m	25 m	− 650 [− 650,− 650] m
Depth from the surface	0–500 m	25 m	50 [50, 75] m
Length	25–1000 m	25 m	650 [625, 675] m
Width	25–1000 m	25 m	425 [150, 1000] m
Dip	0–90°	1°	67 [61, 72]°
Strike	N0–359° E	1°	N18 [17, 19]° E
Opening	− 500–500 cm	1 cm	− 59 [− 74 to − 43] cm

The origin of the horizontal coordinate is BM. 1 (137.597735° E, 36.58748187° N). The uncertainties are the 99% confidence intervals estimated from an F-test (Árnadóttir and Segall 1994). The position is at the center of the top edge of the fault. The dip is clockwise from the horizontal, and the strike is clockwise from the north