A new approach to earthquake precursors distinction


  • V. E. Korepanov Lviv Center of the Institute of Space Research of NAS and NCA of Ukraine, Ukraine
  • F. L. Dudkin Lviv Center of the Institute of Space Research of NAS and NCA of Ukraine, Ukraine




A lithospheric ultra low frequency (ULF) magnetic activity is recently considered as very promising candidate for application to short-time earthquake (EQ) forecasting. However the ULF lithospheric magnetic field is very weak and masked by much stronger ionospheric and magnetospheric signals. The study of pre-earthquake magnetic activity is very hard problem which consists of identification and localization of weak signal sources in seismo-hazardous area of the Earth crust. A new approach is developed to find a source of pre-EQ ULF electromagnetic activity of lithospheric origin. For separation and localization of EQ magnetic precursors the polarization ellipse technique has been developed to process the measurements data acquired from 3-component magnetometers. The method efficiency is illustrated at the example of the data from fluxgate magnetometers installed in Sichuan province. The Panzhihua earthquake with magnitude Mw 6,0 was happened in the southern part of Sichuan province on August 30, 2008 at 8:30:52 UT. The EQ hypocentre was located in point 26,28 N, 101,92 E at depth 10 km.


Проненко В. Помехозащищенный индукционный магнитометр УНЧ-диапазона // Науч. тр. конф. «Мет рология и измерительная техника», г. Харь кoв, 12-14 окт. 2010 г. - Харьков, 2010. - С. 237-240.

Bai D., Unsworth M. J., Meju M. A., Ma X., Teng J., Kong X., Sun Y, Sun J., Wang L., Jiang C., Zhao C., Xiao P., Liu M. Crustal deformation of the eastern Tibetan plateau revealed by magnetotelluric imaging // Nature Geoscience. Advance online publication. - 2010. - Doi: 10.1038/NGEO830.

Bleier T., Dunson C., Maniscalco M., Bryant N., Bambery R., Freund F. Investigation of ULF magnetic pulsations, air conductivity changes, and infrared signatures associated with the 30 October Alum Rock M5.4 earthquake // Nat. Hazards Earth Syst. Sci. - 2009. - 9. - P. 585-603.

Du A., Huang Q., Yang S. Epicenter location by abnormal ULF electromagnetic emissions // Geophys. Res. Lett. - 2002. - 29 (10). - P. 1455-1458.

Dudkin F., Leontyeva O., Arora B. R., Rawat G., Sharma A. Analysis of magnetic field polarization parameters before and after Koyna earthquakes // Geophys. Res. Abstracts. - 2008. - 10. - EGU2008-A-00054.

Dudkin F., Rawat G., Arora B. R., Korepanov V., Leontyeva O., Sharma A. K. Application of polarization ellipse technique for analysis of ULF magnetic fields from two distant stations in Koyna-Warna seismoactive region, West India // Nat. Hazards Earth Syst. Sci. - 2010. - 10. - P. 1513-1522.

Fraser-Smith A. C., Bernardi A., McGill P. R., Ladd M. E., Helliwell R. A., Villard Jr O. G. Low-frequency magnetic field measurements near the epicenter of the Ms 7.1 Loma Prieta earthquake // Geophys. Res. Lett. - 1990. - 17. - P. 1465-1468.

Hayakawa M., Hattori K., Ohta K. Monitoring of ULF (ultra-low-frequency) Geomagnetic Variations Associated with Earthquakes // Sensors. - 2007. - 7. - P. 1108-1122.

Tullis J., Yund R., Farver J. Deformation enhanced fluid distribution in feldspar aggregates and implications for ductile shear zones // Geology. - 1996. - 24. - P. 63-66.



How to Cite

Korepanov, V. E., & Dudkin, F. L. (2012). A new approach to earthquake precursors distinction. Geofizicheskiy Zhurnal, 34(4), 150–156. https://doi.org/10.24028/gzh.0203-3100.v34i4.2012.116763