3D Inversion of Gravity Data Modeling Using The Chi Fact Algorithm for Revealing Subsurface Structure in Semarang City

Rina Dwi Indriana, Mochamad Aryono Adhi, Danastri L. P. Tampubolon, Sorja Koesuma

Abstract

The interpretation of subsurface in the Semarang City with 3D inversion model using the Chi Fact algorithm has been carried out to reveal the subsurface especially related to the presence of groundwater basins. The gravity data model in this research uses 80 stations with a research area of 20 km2 which is specialized in the surrounding area of Kaligarang district. The results of the 3D inversion using the Chi Fact algorithm founded the distribution of subsurface rock density values in the Semarang City area ranging from 1.6 gr/cc to 2.98 gr/cc. The distribution of subsurface density values indicates the subsurface geological structure of the Semarang City area had a normal fault leading to the southeast.

Keywords

3D inversion; chi fact; gravity method; semarang.

Full Text:

PDF

References

1 Grandis, H. 2009. Pemodelan Inversi Geofisika. (Himpunan Ali Geofisika Indonesia, Jakarta).

2 BPS-Statistic of Semarang Municipality. 2021. Semarang Municipality in Figures, Katalog Number 1102001.3374

3 Sabri, L. M. 2018. Sistem Referensi Vertikal Di Wilayah Land Subsidence (studi kasus: Kota Semarang). Disertasi, Universitas Gadjah Mada, Yogyakarta.

4 Fahrudin. 2011. Studi Sesar Aktif Kinematik dan Dinamik Zona Sesar Kaligarang (KGFZ) Di Semarang. Proceeding The 36th HAGI and 40th IAGI Annual Convention and Exhibition.

5 Poedjoprajitno, S., Wahyudiono, E., & Citra, A. 2008. Reaktivasi Sesar Kali Garang. Jurnal Geologi Indonesia, 3 (3), 129-138.

6 Adhi, M. A., Wahyudi, Suryanto, W., Sarkowi, M. 2018. GRAV3D Validation using Generalized Cross-Validation (GCV) Algorithm by Lower Bounds Approach for 3D Gravity Data Inversion. Scientific Journal of Informatics, 5 (2), 271–277.

7 Hightower, E., Gurnis, M., Avendonk, H.V. 2020. A Bayesian 3-D linear gravity inversion for complex density distributions: application to the Puysegur subduction system. Geophys J Int., 223(3), 1899–918.

8 Maimuna, Kansa, A. 2021. Analisis Anomali Gaya Berat Menggunakan Metode SVD dan Pemodelan 3D (Studi Kasus Gempa di Kepulauan Togean, Kabupaten Tojo Una-Una, Sulawesi Tengah). Jurnal Geofisika, 19 (1), 17-23.

9 Codd, A.L., Gross, L., Aitken, A. 2021. Fast Multi-Resolution 3D Inversion Of Potential Fields With Application To High-Resolution Gravity And Magnetic Anomaly Data From The Eastern Goldfields In Western Australia. Comput Geosci., 157, 1–3.

10 Zurek, J. & Williams‐Jones, G. 2013. The Shallow Structure of Kīlauea Caldera from High‐resolution Bouguer gravity and Total Magnetic Anomaly Mapping: Insights into Progressive Magma Reservoir Growth. Journal of Geophysical Research: Solid Earth, 118(7), 3742-3752.

11 Indriana, R.D., Nurwidyanto, M. I., & Widada, S. 2020. Re -Modeling Kaligarang Fault Base On Satellite Gravity Data. Journal of Physics: Conference Series 1943 (2021) 012004.

12 Mahmoodi, O., Smith, R. S., & Spicer, B. 2017. Using Constrained Inversion of Gravity and Magnetic Field to Produce a 3D Litho‐prediction Model. Geophysical Prospecting. 65(6), 1662-1679.

13 Richard, C., James, G., Shane, B., Vote, J., & Ben, E. 2012. The Virtual Exploration Geophysics Laboratory (VEGL) portal: Harnessing cloud computing for potential-field inversions. ASEG, 1, 1-3

14 Dadan, D. W., Harjono, H., & Sudaryanto. 2014. Struktur Bawah Permukaan Kota Semarang Berdasarkan Data Gayaberat. Ris.Geo.Tam., 24 (1), 53-64

15 Hidayat, E. 2013. Identifikasi sesar aktif di sepanjang jalur Kali Garang Semarang. JSD.Geol., 23 (1), 31 – 37.

16 Pramumijoyo, S. 2000. Existing Active Fault at Semarang, Central Java, Indonesia: Revealed by Remote Sensing and Field Observation. Proceedings of the HOKUDAN International Symposium and School on Active Faulting. Hyogo Japan, 383-385.

17 Supriyadi, Khumaedi, Yusuf M., & Agung W. 2016. Using a time-lapse microgravity model for mapping seawater intrusion around Semarang. AIP Conference Proceedings 1719, 030041.

18 Poedjoprajitno, S., Wahyudiono, J., & Citra, A. 2007. Peran Morfologi Struktur Kaitannya Dengan Deformasi Landform Daerah Semarang Selatan. Publikasi Khusus Pusat Survei Geologi, 49-59.

19 Sarah, D., Soebowo E., Syahbana A.J., Murdohardono D., Setiawan T., Mulyono, A., & Satriyo, N.A. 2012. Perhitungan Penurunan Tanah Lintasan Bandarharjo-Poncol, Kota Semarang Berdasarkan Pemodelan 2 Dimensi. Prosiding Pemaparan Geoteknologi LIPI, Bandung.

20 Sarah, D., Soebowo E., Mulyono A., Satriyo N.A. 2013. Model geologi teknik daerah amblesan tanah kota Semarang bagian Barat. Prosiding Pemaparan Geoteknologi LIPI, Bandung.

21 Ahmad, S. H. , Najib, Trisnawati D., Udhi C. D. , Rheza F. H. , Fitria F. , Brenanto T. W. , Yogiswara G., & Ilma A. 2021. Geological structure influence on landslide occurrences: Tembalang and Banyumanik sub-districts. Semarang City AIP Conference Proceedings 2363, 040014 .

DOI: https://doi.org/10.13057/ijap.v12i1.59295

Refbacks

  • There are currently no refbacks.