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Authors: Masci, F.* 
Thomas, J. N.* 
Title: Comment on “Ultra low frequency (ULF) electromagnetic anomalies associated with large earthquakes in Java Island, Indonesia by using wavelet transform and detrended fluctuation analysis” by Febriani et al. (2014)
Issue Date: 18-Dec-2015
Series/Report no.: /15 (2015)
DOI: 10.5194/nhess-15-2697-2015
Keywords: Geomagnetic field
Magnetic anomalies
Earthquake precursors
Subject Classification01. Atmosphere::01.03. Magnetosphere::01.03.03. Magnetospheric physics 
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies 
Abstract: We examine the recent report of Febriani et al. (2014) in which the authors show changes in ULF magnetic field data prior to the M7.5 Tasikmalaya earthquake that occurred south of Java, Indonesia, on 2 September 2009. Febriani et al. (2014) state that the magnetic changes they found may be related to the impending earthquake. We do not agree that the pre-earthquake magnetic changes shown in Febriani et al. (2014) are seismogenic. These magnetic changes, indeed, are too closely related to global geomagnetic disturbances to be regarded as being of seismic origin.
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