DISCRETEWAVELET ANALYSIS OF L AQUILA EARTHQUAKE 2009 EFFECTS ON THE GEOMAGNETIC FIELD

Virginia Klausner, Margarete O. Domingues, Odim Mendes Junior., Andres R. R. Papa
2011 unpublished
The vertical component of the Earth's magnetic field observed by L'Aquila observatory has been used to detect geomagnetic signal associated with earthquake of 6th of April, 2009. The main shock occurred at 01 : 32 : 41.4 UT and was rated 5.8 on the Richter scale and 6.3 on the moment magnitude scale (M w ). The epicenter occurred at 7 km away from the Geomagnetic Observatory of L'Aquila. This favorable condition is an excellent opportunity for detect the magnetic signals induced by this seismic
more » ... active. To detect these disturbances in the geomagnetic data, the discrete wavelet technique have been used in four levels of decomposition. Using the minutely magnetogram data, we were able to detect the geomagnetic variations induced by the earthquake at the exactly time of the main shock and the following variations due to the aftershocks. The first interpretation of the results suggests that discrete wavelet transform can be used to detect the earthquake effects on the geomagnetic field, but still need further study.
doi:10.5540/dincon.2011.001.1.0183 fatcat:kasp5uotgve4pkilj447uclrda