Penentuan Hiposenter Dan Mekanisme Fokus Gempa Bumi MLv4,8 1 Januari 2015 Di Sekitar Sesar Matano
DOI:
https://doi.org/10.33536/jg.v8i02.1401Keywords:
hypocenter, focal mechanisms, Matano Fault, oblique, left-lateral strike slipAbstract
Earthquake was recorded by BMKG on Thursday January 1, 2015 at 22:20:04.8 GMT or Friday January 2, 2015 at 06:20:04.8 Central Indonesia Time. Hypocenter located at 120.87 E, 2.22 S with depth of 17 km and magnitude MLv4.8. Purpose of this research is to study fault plane mechanism that cause this earthquake using hypocenter and focal mechanisms. This research used waveform MLv4.8 January 1, 2015 which recorded at BMKG earthquake observation stations. Waveform is processed to obtain arrival time P- and S-wave and polarity of arrival time P-wave. Method used to determine hypocenter is Geiger Method with input are arrival time P- and S-wave. Focal mechanisms determined using the first polarity of arrival P-wave and hypocenter from previous step. Hypocenter obtained from this research is located at 2.2073 S, 120.798 E and 10 km depth. RMS is 0.7391. Focal mechanism of this earthquake is oblique fault, is normal fault with left-lateral strike slip component. Parameters are strike 3120, dip 710 and rake -140. This result is consistent with Matano Fault type as a continuation of Palu-Koro Fault. MLv4.8 January 1, 2015 earthquake occurred because Matano Fault activity. Research results can provide a basis form earthquake hazard mitigation along Matano Fault zone.
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References
Bellier, O., Sébrier, M., Seward, D., Beaudouin, T., Villeneuve, M., & Putranto, E. (2006). Fission track and fault kinematics analyses for new insight into the Late Cenozoic tectonic regime changes in West-Central Sulawesi (Indonesia). Tectonophysics, 413(3–4), 201–220. https://doi.org/10.1016/j.tecto.2005.10.036
Cronin, V. (2010). A Primer on Focal Mechanism Solution for Geologists.
Geiger, L. (1912). Probability method for the determination of earthquake epicenters from the arrival time only. Bulletin of St. Louis University, 8, 60–71.
Hamilton, W. (1973). Tectonics of the Indonesian Region. Geology Society of Malaysia, 6(July), 3–10.
Kennett, B. L. N., & Engdah, E. R. (1991). Traveltimes for global earthquake location and phase identification. Geophysical Journal International, 105, 429–465.
Kurniawati, I., Ratri, A. D. P., & Gunawan, T. (2020). Karakteristik gempabumi di sesar matano menggunakan analisis energi kumulatif dan periode ulang. Jurnal Geocelebes, 4(1), 33–40. https://doi.org/10.20956/geocelebes.v4i1.8919
Lahr, J. C. (2012). HYPOELLIPSE: A Computer Program for Determining Local Earthquake Hypocentral Parameters, Magnitude, and First-Motion Pattern (1.1; p. 119). https://pubs.usgs.gov/of/1999/ofr-99-0023/
Massinai, M. A., Massinai, M. F. I., Harimei, B., & Alimuddin, F. (2018). Analysis of Focal Mechanism Distribution in Northern Sulawesi. Journal of Physics: Conf. Series, 1093(012038), 1–8. https://doi.org/10.1088/1742-6596/1093/1/012038
Massinai, M. F. I., Astuti, A. P., Kiraman, M. R. B., Massinai, M. A., & Ramdhan, M. (2019). Hypocenter Determination and Focal Mechanism Solution of May 29 2017 Earthquake around Poso, Central Sulawesi, Indonesia. Journal of Physics: Conference Series, 1341(082017), 1–5. https://doi.org/10.1088/1742-6596/1341/8/082017
Massinai, M. F. I., Lantu, L., Aswad, S., & Massinai, M. A. (2015). Tectonics Earthquake Distribution Pattern Analysis Based Focal Mechanisms (Case Study Sulawesi Island, 1993 – 2012). AIP Conference Proceedings, 1658(030013), 1–10. https://doi.org/10.1063/1.4915021
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