Integrated satellite gravity analysis and HVSR microtremor measures for geothermal potential assessment in the Suban Curup–Rejang Lebong Hot Spring Area, Indonesia

Puja Kasmailen Putri; Ahmad Fauzi Pohan; Ashar Muda Lubis; Brecya Isa Siburian; Marzuki Marzuki

doi:10.2478/cee-2027-0008

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Integrated satellite gravity analysis and HVSR microtremor measures for geothermal potential assessment in the Suban Curup–Rejang Lebong Hot Spring Area, Indonesia

Civil and Environmental Engineering

AHEAD OF PRINT

By: Puja Kasmailen Putri, Ahmad Fauzi Pohan, Ashar Muda Lubis, Brecya Isa Siburian and Marzuki Marzuki

Open Access

|Jul 2026

Figures & Tables

a) Tectonic setting of the Bengkulu area, Sumatra, and distribution of earthquake epicenters; b) geological map of the study area (modified after Gafoer et al. 1992); c) topographic map of the Curup–Rejang Lebong area

Gravity data of the Curup–Rejang Lebong area: a) Gravity disturbance data equivalent to free-air anomalies; b) full-scale topographic gravity derived from SRTM2gravity data

Complete Bouguer anomaly (CBA) map of the Curup–Rejang Lebong area, Indonesia

Regional gravity anomalies of the Suban Curup–Rejang Lebong area derived from the radial averaging process: a regional component and b residual component

Residual gravity anomalies of the Curup–Rejang Lebong area obtained by upward continuation from the ground surface: a) height of 0.8 km; b) height of 1.2 km

Results of residual gravity anomaly inversion in the Curup–Rejang Lebong area: a) measurement data; b) prediction data

Cross-sections of rock density contrast in the Curup–Rejang Lebong area based on 3D inversion

Same as Figure 9, but for the spatial distribution of seismic vulnerability

Same as Figure 9, but for the spatial distribution of sediment thickness

Natural frequency distribution map of the Curup–Suban area based on microtremor measurements. Dashed black boundaries represent high- and low-anomaly zones. Profile lines A–A′, B–B′, C–C′, and D–D′ are shown for further subsurface interpretation

The results of the estimated depth values for each zone

Zones	Gradient	Estimated depth [km]
Regional	−12.509	0.995
Residual	−2.5968	0.206
Noise	−1.3299	0.105

Determination of all parameters in the study for 106 H/V measured sites

No	Measurement point	f₀ [Hz]	A₀ [-]	Kg [-]	H [m]
1	T1	3.21	1.86	1.07	31.17
2	T2	9.14	3.91	1.67	10.94
3	T3	9.11	6.67	4.88	10.98
4	T4	5.17	7.34	10.42	19.36
5	T5	3.47	2.54	1.86	28.82
6	T6	9.05	4.78	2.52	11.05
7	T7	2.38	2.01	1.70	41.95
8	T8	2.56	3.37	4.44	39.03
9	T9	6.48	4.24	2.78	15.44
10	T10	4.47	3.09	2.14	22.35
11	T11	5.16	12.51	30.33	19.38
12	T12	8.64	4.78	2.65	11.57
13	T13	8.44	6.36	4.79	11.85
14	T14	2.94	3.70	4.65	34.03
15	T15	2.61	2.74	2.88	38.27
16	T16	2.98	4.38	6.44	33.55
17	T17	6.73	6.92	7.12	14.87
18	T18	3.18	3.24	3.30	31.43
19	T19	2.13	4.32	8.79	47.05
20	T20	4.13	3.33	2.68	24.18
21	T21	7.57	3.85	1.96	13.21
22	T22	4.95	4.54	4.16	20.20
23	T23	10.74	5.96	3.31	9.31
24	T24	4.04	2.00	0.99	24.78
25	T25	3.15	4.94	7.74	31.74
26	T26	7.13	6.47	5.88	14.02
27	T27	10.12	3.29	1.07	9.88
28	T28	1.90	2.37	2.95	52.69
29	T29	5.09	4.27	3.58	19.65
30	T30	4.30	4.04	3.79	23.25
31	T31	2.34	4.22	7.61	42.74
32	T32	2.20	4.13	7.76	45.53
33	T33	2.44	5.27	11.39	40.93
34	T34	9.06	5.67	3.55	11.04
35	T35	5.04	4.37	3.78	19.83
36	T36	3.51	5.79	9.56	28.51
37	T37	3.52	5.47	8.50	28.42
38	T38	8.92	3.41	1.30	11.22
39	T39	7.54	7.56	7.58	13.26
40	T40	8.34	8.76	9.20	12.00
41	T41	7.43	6.27	5.28	13.46
42	T42	6.75	2.33	0.81	14.81
43	T43	9.50	7.90	6.58	10.53
44	T44	4.33	3.47	2.78	23.10
45	T45	9.20	6.37	4.41	10.87
46	T46	2.49	3.35	4.49	40.11
47	T47	9.13	4.62	2.34	10.96
48	T48	2.37	4.45	8.38	42.23
49	T49	2.63	3.09	3.61	37.97
50	T50	2.58	4.48	7.76	38.74
51	T51	3.06	5.14	8.64	32.70
52	T52	3.70	3.53	3.37	27.02
53	T53	6.76	5.33	4.20	14.80
54	T54	2.22	2.64	3.14	45.01
55	T55	2.62	3.53	4.74	38.13
56	T56	7.91	7.85	7.78	12.64
57	T57	2.66	5.54	11.52	37.60
58	T58	3.34	4.91	7.22	29.91
59	T59	2.42	3.97	6.53	41.33
60	T60	2.66	4.69	8.27	37.66
61	T61	2.56	5.49	11.78	39.03
62	T62	3.73	2.75	2.03	26.78
63	T63	6.39	2.56	1.02	15.66
64	T64	2.21	3.85	6.71	45.30
65	T65	6.96	2.57	0.95	14.37
66	T66	5.84	8.29	11.77	17.13
67	T67	2.31	3.64	5.75	43.35
68	T68	9.03	1.90	0.40	11.07
69	T69	4.55	1.82	0.73	21.96
70	T70	10.13	4.02	1.60	9.88
71	T71	6.92	2.80	1.13	14.46
72	T72	5.05	4.73	4.42	19.79
73	T73	0.98	4.23	18.26	102.0
74	T74	10.44	1.96	0.37	9.57
75	T75	7.44	4.47	2.69	13.45
76	T76	8.59	2.08	0.50	11.64
77	T77	10.70	3.07	0.88	9.35
78	T78	10.15	7.00	4.84	9.86
79	T79	6.81	4.32	2.73	14.68
80	T80	3.04	1.94	1.24	32.94
81	T81	2.08	3.72	6.65	48.05
82	T82	7.57	3.01	1.20	13.21
83	T83	3.73	3.65	3.57	26.84
84	T84	2.03	3.28	5.29	49.26
85	T85	8.64	1.44	0.24	11.57
86	T86	8.85	4.50	2.28	11.30
87	T87	8.84	4.42	2.21	11.30
88	T88	2.02	5.17	13.20	49.46
89	T89	7.63	3.19	1.33	13.11
90	T90	3.32	8.22	20.35	30.11
91	T91	2.47	1.98	1.59	40.47
92	T92	2.91	2.40	1.98	34.32
93	T93	9.26	7.00	5.29	10.80
94	T94	7.63	3.64	1.74	13.10
95	T95	9.32	6.98	5.22	10.73
96	T96	2.00	3.45	5.95	50.05
97	T97	2.93	3.42	3.99	34.17
98	T98	7.64	2.38	0.74	13.09
99	T99	5.75	3.11	1.69	17.40
100	T100	4.64	1.19	0.31	21.57
101	T101	1.05	3.50	11.65	95.09
102	T102	8.35	10.06	12.12	11.98
103	T103	5.51	4.77	4.13	18.14
104	T104	4.52	1.72	0.66	22.14
105	T105	3.66	2.05	1.14	27.29
106	T106	6.37	2.64	1.09	15.69

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DOI: https://doi.org/10.2478/cee-2027-0008 | Journal eISSN: 2199-6512 | Journal ISSN: 1336-5835

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Language: English

Submitted on: May 30, 2026

Accepted on: Jun 25, 2026

Published on: Jul 22, 2026

Published by: University of Žilina

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Geothermal,

Microtremor,

HVSR,

Gravity,

Inversion modeling

Related subjects:

Business and economics,

Business management,

Industries,

Environmental management

© 2026 Puja Kasmailen Putri, Ahmad Fauzi Pohan, Ashar Muda Lubis, Brecya Isa Siburian, Marzuki Marzuki, published by University of Žilina
This work is licensed under the Creative Commons Attribution 4.0 License.

AHEAD OF PRINT

Integrated satellite gravity analysis and HVSR microtremor measures for geothermal potential assessment in the Suban Curup–Rejang Lebong Hot Spring Area, Indonesia

Figures & Tables

Figure 1:

Figure 2:

Figure 3:

Figure 4:

Figure 5:

Figure 6:

Figure 7:

Figure 8:

Figure 9:

Figure 10:

Figure 11:

Figure 12:

The results of the estimated depth values for each zone

Determination of all parameters in the study for 106 H/V measured sites

Paradigm

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