Table 8 Lithological information based on geoelectrical survey.

Depth	Rock type	Resistivity	K m/day	LN(K)	K cm/day	Ln K	Rating
Lava of Katu cone formation (Qlk)
0–56	Tuf	3424.39	1.2867E−05	− 11.2608	0.001286733	− 6.655649122	2
56–90	Basalt	1369.98	1.0391839	0.038436	103.9183898	4.643605878
90–100	Andesit	935.23	11.3538931	2.429561	1135.389313	7.034730878
SUM			12.3930899	− 8.79282	1239.308989	5.022687633
Geometric mean				− 2.93094		1.674229211
Exp mean ln(K)				0.053347		5.334681651
Arithmetric mean				4.13103		413.1029964

Depth	Rock type	Resistivity	K m/day	LN(K)	K cm/hari	Ln (K)	Rating
Kawi-Butak Volcano Formation (Qpkb)
0–45	Sand	866.15	2.46439E−06	− 12.91357	0.000246439	− 8.308397646	1
45–80	Tuf	2054.79	0.024040405	− 3.728019	2.404040534	0.877150878
80–100	Andesit	1042.55	6.292136579	1.8393007	629.2136579	6.444470878
SUM			6.316179449	− 14.80229	631.6179449	− 0.98677589
Geometric Mean				− 4.934095		− 0.328925297
Exp Mean ln(K)				0.007197		0.719696778
Arithmetric Mean				2.1053931		210.539315
Malang Tuff Formation (Qvtm1)
0–42	Alluvium	172.06	755.209875	6.626995	75520.9875	11.2321658	6
42–66	Tuf	2739.59	0.00055618	− 7.494419	0.05561795	− 2.88924912
66–78	Sand	639.01	57.9030865	4.058770	5790.30865	8.663940878
78–100	Andesitic Fragmen	655.19	9.53728E− 05	− 13.86289	9.53728E− 05	− 9.25771764
SUM			813.113519	− 10.67154	81311.3519	7.74913998
Geometric Mean				− 2.667885		2.58304666
Exp Mean ln(K)				0.0693988		13.2374067
Arithmetric Mean				203.27838		27103.78398
Buring Volcanic Sediment Formation (Qpvb1)
0–42	Sand	739.25	33.36310644	3.5074507	3336.310644	8.112620878	8
42–64	Tuf	2253.25	0.001266348	− 6.671618	0.126634835	− 2.066447646
64–85	Basalt	1093.28	4.760180995	1.5602857	476.0180995	6.165455878
85–100	Andesit	829.65	20.29248645	3.0102507	2029.248645	7.615420878
SUM			58.41704023	1.4063692	5841.704023	19.82704999
Geometric Mean				0.3515923		6.609016663
Exp Mean ln(K)				1.4213289		741.7532662
Arithmetric Mean				14.60426		1947.234674

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