1Istituto Nazionale di Geofisica e Vulcanologia, L'Aquila, Italy
2NorthWest Research Associates, Redmond, Washington, USA
3Department of Electrical and Computer Engineering, DigiPen Institute of Technology, Redmond, Washington, USA
4Department of Earth and Space Sciences, University of Washington, Seattle, Washington, USA
Received: 31 Mar 2015 – Discussion started: 23 Sep 2015
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.
Revised: 09 Dec 2015 – Accepted: 09 Dec 2015 – Published: 18 Dec 2015
Masci, F. and Thomas, J. N.: 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), Nat. Hazards Earth Syst. Sci., 15, 2697-2701, doi:10.5194/nhess-15-2697-2015, 2015.