Pengukuran Kecepatan Gelombang Seismik Menggunakan Metode Refraksi Pada Lapisan Tanah Dangkal

Authors

  • Admiral Musa Julius Badan Meteorologi Klimatologi dan Geofisika
  • Rian Mahendra Taruna Badan Meteorologi Klimatologi dan Geofisika
  • Shandy Yogaswara Surya Putra Badan Meteorologi Klimatologi dan Geofisika
  • Pande Komang Gede Arta Negara Badan Meteorologi Klimatologi dan Geofisika
  • Bryan Fitzgerald Amos Rumy Badan Meteorologi Klimatologi dan Geofisika
  • Alghani Yullatifah Badan Meteorologi Klimatologi dan Geofisika
  • Else Nopianti Badan Meteorologi Klimatologi dan Geofisika
  • Nurain Silvana Akuba Badan Meteorologi Klimatologi dan Geofisika
  • Taufan Taufik Badan Meteorologi Klimatologi dan Geofisika
  • Hendri Subakti Badan Meteorologi Klimatologi dan Geofisika
  • I Dewa Ketut Kerta Widana Sekolah Tinggi Meteorologi Klimatologi dan Geofisika

DOI:

https://doi.org/10.29408/geodika.v4i1.1915

Keywords:

seismic refraction, geo-hazard, soil properties

Abstract

The strong and felt earthquake with magnitude 6.5 occurred in 119 km to the southeast of Cilacap Regency, Central Java Province at a depth of 48 km. The earthquake centered on the sea at coordinates 8.48o latitude and 109.17o east longitude on January 25, 2014. The earthquake triggered damage in several locations, including the districts of Banyumas, Kebumen, Cilacap and Purworejo. In order to mitigate natural hazards, this study aims to determine the relationship between seismic wave velocity and depth of layers near the surface in shallow geological structures. The method used in this study is the seismic refraction method. This method is done by interpreting seismic signals from man-made waves that spread near the surface of the earth. The seismogram will display the travel time of the waves, the distance between the waves and the source of the waves themselves. The structure of the geological layers that exist in the earth can be estimated based on the magnitude of the seismic wave velocity. This research is located in the campus area of the Indonesian Institute of Sciences Karangsambung. Measurements were made considering its location close to the center of the earthquake and the uniqueness of the rock formed by the removal of the ocean floor. Based on the results of the study it is known that there is a relationship between seismic wave velocity and the depth of the layers near the surface. The deeper the layer of soil from the earth's surface, the seismic wave velocity will be higher.

References

Agus, R.N., Suardi, I., Sipayung, R. & Sianipar, D. (2018). Local seismicity pattern around Mt. Pandan, East Java according to February 2016 earthquake swarms activity. AIP Conference Proceedings 1987, 020034.

Aminatun, S. (2017). Kajian analisis risiko bencana tanah longsor sebagai dasar dalam pembangunan pembangunan infrastruktur di Desa Sriharjo Kecamatan Imogiri Kabupaten Bantul. Jurnal Teknisia, 21(2), 372-382.

Aminatun, S., & Muntafi, Y. (2016). Kajian analisis risiko bencana tanah longsor di Desa Terong Kecamatan Dlingo Kabupaten Bantul. Jurnal Teknisia, 21(2), 250-260.

Apriani, M., Julius, A.M., Yusuf, M., Heryanto, D.T., & Marsono, A. (2017). Estimation of sediment thickness using power spectral analysis of gravity data, case study Capital Region of Jakarta. Jurnal Ilmiah Geomatika, 23(2), 65-74.

BNPB. (2016). Risiko Bencana Indonesia. Jakarta: Badan Nasional Penanggulangan Bencana.

Hadi, H., Agustina, S., & Subhani, A. (2019). Penguatan kesiapsiagaan stakeholder dalam pengurangan risiko bencana alam gempabumi. Geodika: Jurnal Kajian Ilmu dan Pendidikan Geografi, 3(1), 30-40.

Nurdiyanto, B., Hartanto, E., Ngadmanto, D., Sunardi, B., & Susilanto, P. (2011). Penentuan tingkat kekerasan batuan menggunakan metode seismik refraksi. Jurnal Meteorologi dan Geofisika, 12(3).

Octhav, A., Julius, A.M., Muzli, & Rudyanto, A. (2017). Modified of ground motion prediction equation in Indonesia, case study: South and South-East of Sulawesi at 2011-2015. AIP Conference Proceedings. 1857, 020003.

Pusat Gempabumi dan Tsunami BMKG. (2019). Katalog gempabumi signifikan dan merusak tahun 1821-2018. Jakarta: Badan Meteorologi Klimatologi dan Geofisika.

Raharjo, S.A. (2002). Analisis kecepatan perambatan gelombang bias pada medium dan faktor kualitas medium di lereng barat Gunung Merapi. Skripsi, tidak dipublikasikan. Yogyakarta: Universitas Gadjah Mada.

Rahman, A. Z. (2015). Kajian mitigasi bencana tanah longsor di Kabupaten Banjarnegara. Gema Publica: Jurnal Manajemen dan Kebijakan Publik, 1(1), 1-14.

Rahman, A., Marsono. A., & Rudyanto, A. (2017). Rapid magnitude estimation using Ï„C method for earthquake early warning system (Case study in Sumatra). AIP Conference Proceedings. 1857, 020017.

Sagala, R.A., Harjadi, P.P.J., Heryandoko, N., & Sianipar, D. (2017). Detailed seismotectonic analysis of Sumatra subduction zone revealed by high precision earthquake location. AIP Conference Proceedings. 1857 (1), 020015.

Serhalawan, Y.R., Sianipar, D., & Suardi, I. (2017). The January 25th, 2014 Kebumen earthquake: A normal faulting in subduction zone of Southern Java. AIP Conference Proceedings. 1857 (1), 030002.

Setiadi, T. A. P., Rohadi, S., & Heryandoko, N. (2017). Earthquake relocation in Mollucas Sea using teleseismic double difference method for tectonic setting analysis. AIP Conference Proceedings. 1857, 020007.

Sipayung, R., Alhafiz, M.R., Agus, R.N., & Sianipar, D. (2018). Relocation of the February 2016 Mt. Pandan earthquake sequence using double difference with waveform cross correlation. AIP Conference Proceedings. 1987 (1), 020036.

Sismanto. (1999). Eksplorasi dengan menggunakan seismik refraksi. Yogyakarta: Gadjah Mada University Press.

Taib, M.I.T. (1985). Engineering seismology. Buku tidak dipublikasikan, Institut Teknologi Bandung Press.

Tjetjep (1995). Model simulasi struktur multi lapisan dari data seismik refraksi dengan menggunakan metode time plus minus. Skripsi, tidak dipublikasikan. Bandung: Institut Teknologi Bandung.

Tribunnews.com. (2014). 93 rumah di Banyumas rusak akibat gempa. Diakses tanggal 25 Juni 2020 dari https://jogja.tribunnews.com/2014/01/25/93-rumah-di-banyumas-rusak-akibat-gempa.

Downloads

Published

2020-06-29

Issue

Section

Articles