SEISMIC STATIONS CATEGORIZATION AND ITS EFFECT ON THE BMKG EARTHQUAKE MAGNITUDE PARAMETERS DETERMINATION
DOI:
https://doi.org/10.31172/jmg.v24i1.886Keywords:
Magnitude, trimmed mean, site quality, primary station, secondary stationAbstract
The responsibility to send information within five minutes causes the magnitude disseminated by BMKG only from limited seismic records. The result shows that the magnitude produced in the first five minutes can fluctuate and cause a difference in the final magnitude. In the SeisComP system at BMKG, the event magnitudes of each type of magnitude MLv, mb, mB, and Mwp, are the result of the station magnitude average using trimmed mean, so the largest or smallest station magnitudes will become outliers and are eliminated in event magnitude calculation. However, the drawback of the trimmed mean is seismic stations that always tend to be outliers have the potential to be still involved in determining the event magnitude in the early minutes so that it can disrupt the magnitude calculation. This study aims to reduce the fluctuations in determining the magnitude in the first five minutes by identifying seismic stations that are often eliminated by the trimmed mean method and classifying them. We validate them with the site quality of the station and create two main categories of seismic stations. The first category is primary stations to determine the location and magnitude of earthquakes. The second category is secondary stations used only at the earthquake site, then tested using SeisComP playback by replaying 256 earthquake events. The results show a correlation where good site quality will also produce a good magnitude value, indicated by 285 seismic stations, and can be categorized as primary stations. The remaining 126 seismic stations are categorized as secondary stations. The playback results show that the fluctuation of magnitude determination in the first five minutes using the primary station can be reduced, as indicated by the mean residual and the deviation to the final magnitude.References
Republik Indonesia. Undang-Undang Nomor 31 Tahun 2009 tentang Meteorologi, Klimatologi, dan Geofisika. Lembaran Negara RI Tahun 2009 Nomor 139, Tambahan Lembaran RI Nomor 5058. Jakarta: Sekretariat Negara, 2009
Steinmetz, T., Raape, U., Teßmann, S., Strobl, C., Friedemann, M., Kukofka, T., Riedlinger, T., Mikusch, E., and Dech, S.: Tsunami early warning and decision support, Nat. Hazards Earth Syst. Sci., 10, 1839–1850, https://doi.org/10.5194/nhess-10-1839-2010, 2010.
UNESCO/IOC. IOTWMS User Guide for National Tsunami Warning Centres: Version 2.0. Paris, UNESCO. IOC Technical Series No 145. 2019.
Richter, C. F. An Instrumental Earthquake Magnitudo Scale, Bulletin of the Seismological Society of America, 25 (1): 1–32, 1935.
Gutenberg, B. Amplitudes of P, PP, and S and magnitude of shallow earthquakes. Bull. Seism. Soc. Am., 35, 57-69, 1945.
Abe, K. Magnitudes of large shallow earthquakes from 1904 to 1980. Phys. Earth Planet. Interiors, 27, 72-92, 1981.
Tsuboi, S., Abe, K., Takano, K., and Yamanaka, Y. Rapid determination of Mw from broadband P waveforms. Bull. Seism. Soc. Am., 85, 2, 606-613, 1995.
Helmholtz-Centre Potsdam - GFZ German Research Centre for Geosciences and gempa GmbH. The SeisComP seismological software package. GFZ Data Services. doi: 10.5880/GFZ.2.4.2020.003, 2008.
gempa GmbH, GFZ Potsdam. Scmag, Calculates magnitudes of different types. Internet: https://docs.gempa.de/seiscomp/current/apps/scmag.html, diakses 23 Maret 2022
Bormann, P., Dewey, J. W. The new IASPEI standards for determining magnitudes from digital data and their relation to classical magnitudes. - In: Bormann, P. (Ed.), New Manual of Seismological Observatory Practice 2 (NMSOP-2), Potsdam : Deutsches GeoForschungsZentrum GFZ, 1-44. https://doi.org/10.2312/GFZ.NMSOP-2_IS_3.3, 2014
Bormann, P., Wendt, S., DiGiacomo, D. Seismic Sources and Source Parameters. - In: Bormann, P. (Ed.), New Manual of Seismological Observatory Practice 2 (NMSOP2), Potsdam : Deutsches GeoForschungsZentrum GFZ, 1-259. https://doi.org/10.2312/GFZ.NMSOP-2_ch3, 2013
Tukey, John W., and Donald H. McLaughlin. “Less Vulnerable Confidence and Significance Procedures for Location Based on a Single Sample: Trimming/Winsorization 1.” Sankhyā: The Indian Journal of Statistics, Series A (1961-2002), vol. 25, no. 3, 1963, pp. 331–52, http://www.jstor.org/stable/25049278. Accessed 11 Apr. 2022.
gempa GmbH, GFZ Potsdam. Scolv, Origin locator view. Internet: https://www.seiscomp.de/seiscomp3/doc/jakarta/current/apps/scolv.html, diakses 23 Maret 2022
Visser, Ryan & Kao, Honn & Smith, Brindley & Goerzen, Chet & Kontou, Byron & Dokht, Ramin & Hutchinson, Jesse & Tan, Fengzhou & Mahani, Alireza. A comprehensive earthquake catalogue for the Fort St. John-Dawson Creek region, British Columbia, 2017-2018. DOI:10.4095/326015, 2020.
B. PADMANABHAMURTY, “Station magnitude corrections for Shillong, Poona and New Delhi”, MAUSAM, vol. 20, no. 3, Apr. 2022.
Nakata, J. S., Okubo, P. G. Determination of station amplitude magnitude corrections for the Hawaiian Volcano Observatory telemetered seismographic network. USGS Publications Warehouse. DOI:10.3133/ofr97863, 1997
BMKG. Repository Katalog dan Buletin parameter gempabumi BMKG. Internet: http://repogempa.bmkg.go.id/repo_new/, diakses 10 Oktober 2021
BMKG. SEISMIC STATION QUALITY EVALUATION SYSTEM (SQES). Internet: http://182.16.248.172/sensorbmkg/ diakses 2 Februari 2022
Wielandt, E. Seismic Sensors and their Calibration. - In: Bormann, P. (Ed.), New Manual of Seismological Observatory Practice 2 (NMSOP-2), Potsdam : Deutsches GeoForschungsZentrum GFZ, 1-51.https://doi.org/10.2312/GFZ.NMSOP-2_ch5, 2008.
Peterson, J. Observations and modelling of seismic background noise. U.S. Geol. Survey Open-File Report 93-322, 95 pp, 1993.
Zhao, J. X., Irikura, K., Zhang, J., Fukushima, Y., Somerville, P. G., Asano, A., Ohno, Y., Oouchi, T., Takahashi, T., & Ogawa, H. An empirical site-classification method for strong-motion stations in Japan using H/V response spectral ratio. Bulletin of the Seismological Society of America, 96(3), 914-925. https://doi.org/10.1785/0120050124, 2006.
BSSC (Building Seismic Safety Council) (2003) NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures. Part 1: Provisions, Prepared by the Building Seismic Safety Council for the Federal Emergency Management Agency (Report FEMA 450), Washington DC, 356 p.
Li, Bo & Liu, Chengyu & Zhang, Zhengshuai & Guoyi, Li. Research on the management of seismic data quality assessment methods. E3S Web of Conferences. 253. 01072. 10.1051/e3sconf/202125301072. 2021.
J.Saul, A. Heinloo, J Backer, B. Weber. Playback in SeisComP3, SeisComP3 User Group Meeting 2013, Potsdam, 2013
gempa GmbH, GFZ Potsdam. SeisComP3 Configuration Internet: https://www.seiscomp.de/seiscomp3/doc/jakarta/current/apps/global.html, diakses 23 Maret 2022
Bormann, P., Wendt, S., DiGiacomo, D. Seismic Sources and Source Parameters. - In: Bormann, P. (Ed.), New Manual of Seismological Observatory Practice 2 (NMSOP2), Potsdam : Deutsches GeoForschungsZentrum GFZ, 1-259. https://doi.org/10.2312/GFZ.NMSOP-2_ch3, 2013
Bormann, P., Dewey, J. W. The new IASPEI standards for determining magnitudes from digital data and their relation to classical magnitudes. - In: Bormann, P. (Ed.), New Manual of Seismological Observatory Practice 2 (NMSOP-2), Potsdam : Deutsches GeoForschungsZentrum GFZ, 1-44. https://doi.org/10.2312/GFZ.NMSOP-2_IS_3.3, 2014
Hutton, L. K., and Boore, D. M. The ML scale in Southern California. Bull. Seism. Soc. Am., 77, 6, 2074-2094, 1987.
Whitmore, P. M., Tsuboi, S., Hirshorn, B., and Sokolowski, T. J. Magnitudo-dependent correction for Mwp, Science of Tsunami Hazards, 20, 187–192, 2002.
Peter Bormann, Joachim Saul. The New IASPEI Standard Broadband Magnitudo mB. Seismological Research Letters. 698–705. doi: https://doi.org/10.1785/gssrl.79.5.698, 2008.
Hanka, W., Saul, J., Weber, B., Becker, J., dan Harjadi, P. (2010). Real-time earthquake monitoring for tsunami warning in the Indian Ocean and beyond. Natural Hazards and Earth System Sciences, 10(12), 2611–2622. https://doi.org/10.5194/nhess-10-2611-2010.
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