SLIP SOURCE MODEL OF THE 1995 NEFTEGORSK EARTHQUAKE (NORTH SAKHALIN) FROM GEODETIC DATA
https://doi.org/10.5800/GT-2023-14-4-0712
Abstract
The May 27, 1995 Mw=7.0 Neftegorsk earthquake occurred in the north of Sakhalin Island, rupturing the Upper Piltun fault, a secondary feature of the main Hokkaido-Sakhalin regional fault zone. The fault geometry, coseismic slip model, and Coulomb stress changes in the earthquake focal area were calculated based on a finite fault modeling. We used near-field coseismic offsets at 24 points obtained by comparison between predating triangulation and GPS observations, which were collected before and after the earthquake. Our slip distribution model shows two major slip patches. Larger slip asperity (amplitude up to 6.36 m) was characterized by right-lateral strike-slip movements, which correspond to focal mechanism of the earthquake, whereas the northern segment has reverse fault mechanism with maximum slip of 2.64 m. The fault length and width, average slip and stress drop values are estimated at 78 km, 28 km, 1.91 m and 11.3 MPa, respectively. The estimated release moment is approximately 7.49×1019 N∙m equal to Mw=7.2, which is larger than that reported by the USGS and GCMT but consistent with the values reported by other researchers. The coseismic Coulomb stress changes enhanced the stress by more than 10 MPa on the southern segment of the Gyrgylaninsky fault and middle section of the Hokkaido–Sakhalin fault. Seismic risks on the nearest faults cannot be ignored in the future despite the fact that the earthquake with a magnitude of 5.8 occurred in 2010 near the Gyrgylaninsky fault. The recent GPS rates in the surroundings of the Neftegorsk surface rupture mean that the recurrence interval for similar earthquakes may be more than a thousand years.
Supporting agencies: The research was carried out within the state assignment of IMGG FEB RAS, with the support of the Ministry of Science and Higher Education of the Russian Federation (theme 121022000085-9).
About the Authors
A. S. Prytkov
Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
1B Nauki St, Yuzhno-Sakhalinsk 693022
N. F. Vasilenko
Institute of Marine Geology and Geophysics, Far Eastern Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
1B Nauki St, Yuzhno-Sakhalinsk 693022
References
1. Arefiev S., Rogozhin E., Tatevossian R., Rivera L., Cisternas A., 2000. The Neftegorsk (Sakhalin Island) 1995 Earthquake: a Rare Interplate Event. Geophysical Journal International 143 (3), 595–607. https://doi.org/10.1046/j.1365-246X.2000.00234.x.
2. DeMets C., Gordon R.G., Argus D.F., 2010. Geologically Current Plate Motions. Geophysical Journal International 181 (1), 1–80. https://doi.org/10.1111/j.1365-246X.2009.04491.x.
3. Global CMT Catalog, 2022. Available from: https://www.globalcmt.org/CMTsearch.html (Last Accessed May 4, 2022).
4. GS RAS Seismic Catalogues and Bulletin, 2022. Available from: http://www.ceme.gsras.ru/new/eng/catalog/ (Last Accessed May 4, 2022).
5. Katsumata K., Kasahara M., Ichiyanagi M., Kikuchi M., Sen R., Kim C.U., Ivaschenko A., Tatevossian R., 2004. The 27 May 1995 Ms 7.6 Northern Sakhalin Earthquake: An Earthquake on an Uncertain Plate Boundary. Bulletin of the Seismological Society of America 94 (1), 117–130. http://doi.org/10.1785/0120020175.
6. Kharakhinov V.V., 2010. Oil-Gas Geology of the Sakhalin Region. Nauchnyy Mir, Moscow, 276 p. (in Russian).
7. King G.C.P., Stein R.S., Lin J., 1994. Static Stress Changes and the Triggering of Earthquakes. Bulletin of the Seismological Society of America 84 (3), 935–953. DOI:10.1785/BSSA0840030935.
8. Kozhurin A.I., 2004. Active Faulting at the Eurasian, North American and Pacific Plates Junction. Tectonophysics 380 (3–4), 273–285. https://doi.org/10.1016/j.tecto.2003.09.024.
9. Okada Y., 1985. Surface Deformation Due to Shear and Tensile Faults in a Halfspace. Bulletin of the Seismological Society of America 75 (4), 1135–1154. https://doi.org/10.1785/BSSA0750041135.
10. Polets A.Yu., Zlobin T.K., 2017. 1995 Neftegorsk Earthquake Source Inversion Model. Vestnik of the Far East Branch of the Russian Academy of Science 191 (1), 38–42 (in Russian)
11. Pritchard M.E., Fielding E.J., 2008. A Study of the 2006 and 2007 Earthquake Sequence of Pisco, Peru, with InSAR and Teleseismic Data. Geophysical Research Letters 35 (9), L09308. https://doi.org/10.1029/2008GL033374.
12. Prytkov A.S., Vasilenko N.F., 2018. Earth Surface Deformation of the Sakhalin Island from GPS Data. Geodynamics & Tectonophysics 9 (2), 503–514 (in Russian) https://doi.org/10.5800/GT-2018-9-2-0358.
13. Rogozhin E.A., 1995. The Neftegorsk Earthquake May 27 (28), 1995: Geological Evidence and Tectonic Setting. In: The Neftegorsk Earthquake May 27 (28), 1995. Information Analysis Bulletin of the Federal System of Seismological Observations and Earthquake Prediction. Spec. Iss. Moscow, p. 80–94 (in Russian)
14. Shan B., Xiong X., Zheng Y., Wei S., Wen Y., Jin B., Ge C., 2011. The Co-Seismic Coulomb Stress Change and Expected Seismicity Rate Caused by 14 April 2010 Ms=7.1 Yushu, China, Earthquake. Tectonophysics 510 (3–4), 345–353. https://doi.org/10.1016/j.tecto.2011.08.003.
15. Shan B., Zheng Y., Liu C.L., Xie Z.J., Kong J., 2017. Coseismic Coulomb Failure Stress Changes Caused by the 2017 M7.0 Jiuzhaigou Earthquake, and Its Relationship with the 2008 Wenchuan Earthquake. Science China Earth Sciences 60, 2181–2189. https://doi.org/10.1007/s11430-017-9125-2.
16. Shimamoto T., Watanabe M., Suzuki Y., 1995. Surface Faults and Damage Associated with the 1995 Neftegorsk Earthquake. In: The May 27(28), 1995 Neftegorsk Earthquake. Information Analysis Bulletin of the Federal System of Seismological Observations and Earthquake Prediction. Spec. Iss. Moscow, p. 101–116 (in Russian) .
17. Shimamoto T., Watanabe M., Suzuki Y., Kozhurin A., Strel’tsov M., Rogozhin E., 1996. Surface Faults and Damage Associated with the 1995 Neftegorsk Earthquake. The Journal of the Geological Society of Japan 102 (10), 894–907.
18. Tabrez A.S., Freed A.M., Calais E., Manaker D.M., McCann W.R., 2008. Coulomb Stress Evolution in Northeastern Caribbean over the Past 250 Years due to Coseismic, Postseismic and Interseismic Deformation. Geophysical Journal International 174 (3), 904–918. https://doi.org/10.1111/j.1365-246X.2008.03634.x.
19. Takahashi H., Kasahara M., Vasilenko N., Kim C.U., Ivashenko A., Kimata F., Seno T., 1996. Coseismic Deformation around the Northern Part of Epicentral Area of the 1995 North Sakhalin Earthquake Deduced from Geodetic Observations. In: Report on North Sakhalin Earthquake and Its Disaster. P. 191–202.
20. Takahashi H., Vasilenko N., Kimata F., Kasahara M., Seno T., Kim C.U., Ivashchenko A., 1995. Coseismic Deformation around the Northern Part of Epicentral Area of the 1995 North Sakhalin Earthquake Deduced from Geodetic Observations. In: The May 27(28), 1995 Neftegorsk Earthquake. Information Analysis Bulletin of the Federal System of Seismological Observations and Earthquake Prediction. Spec. Iss. Moscow, p. 123–128 (in Russian)
21. Toda S., Stein R.S., Sevilgen V., Lin J., 2011. Coulomb 3.3. Graphic-Rich Deformation and Stress-Change Software for Earthquake, Tectonic, and Volcano Research and Teaching. User Guide. USGS Open-File Report 2011–1060, 63 p.
22. USGS Earthquake Hazards Program, 2022. Available from: https://earthquake.usgs.gov/earthquakes/search/ (Last Accessed May 4, 2022).
23. Vasilenko N.F., Prytkov A.S., Kasahara M., Takahashi H., 2015. Recent Geodynamics of the Northern Sakhalin before and after May 27 (28), 1995 Mw 7.0 Neftegorsk Earthquake. In: Geodynamical Processes and Natural Hazards. Lesson of Neftegorsk: Proceedings of the All-Russian Scientific Conference with International Participation (May 26–30, 2015, Yuzhno-Sakhalinsk). Vol. 1. Dal’nauka, Vladivostok, p. 13–16 (in Russian)
Review
For citations:
Prytkov A.S., Vasilenko N.F. SLIP SOURCE MODEL OF THE 1995 NEFTEGORSK EARTHQUAKE (NORTH SAKHALIN) FROM GEODETIC DATA. Geodynamics & Tectonophysics. 2023;14(4):0712. https://doi.org/10.5800/GT-2023-14-4-0712
Views:
445
Email this article 