A new approach to earthquake precursors distinction
AbstractA 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
Copyright (c) 2020 Geofizicheskiy Zhurnal
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).