Novelty detection in time series of ULF magnetic and electric components obtained from DEMETER satellite experiments above Samoa (29 September 2009) earthquake region
-
Published:2013-01-09
Issue:1
Volume:13
Page:15-25
-
ISSN:1684-9981
-
Container-title:Natural Hazards and Earth System Sciences
-
language:en
-
Short-container-title:Nat. Hazards Earth Syst. Sci.
Abstract
Abstract. Using ULF (ultra low frequency) measurements of magnetometer and ICE (Instrument Champ Electrique) experiments on board the DEMETER satellite, possible irregularities in ULF magnetic and electric components have been surveyed in the vicinity of Samoa (29 September 2009) earthquake region. The data used in this paper cover the period from 1 August 2009 to 11 October 2009. The anomalous variations in magnetic components (Bx, By and Bz) were clearly observed on 1 and 3 days before the event. It is seen that the periodic patterns of the magnetic components obviously changed prior to the earthquake. These unusual variations have been also observed in the variations of polarization index obtained from the magnetic components during the whole period at ~10:30 and ~22:30 LT. It is concluded that the polarization exhibits an apparent increase on 1 and 3 days preceding the earthquake. These observed unusual disturbances in ULF magnetic components were acknowledged using the detected perturbations in ULF electric components (Ex, Ey and Ez) in the geomagnetic coordinate system. Finally, the results reported in this paper were compared with previous results for this Samoa earthquake. Hence, the detected anomalies resulting from the magnetometer and ICE ULF waveforms in quiet geomagnetic conditions could be regarded as seismo-ionospheric precursors.
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences
Reference24 articles.
1. Akhoondzadeh, M.: Comparative study of the earthquake precursors obtained from satellite data, PhD thesis, University of Tehran, Surveying and Geomatics Engineering Department, Remote Sensing Division, 2011. 2. Akhoondzadeh, M., Parrot, M., and Saradjian, M. R.: Electron and ion density variations before strong earthquakes ($M>6.0$) using DEMETER and GPS data, Nat. Hazards Earth Syst. Sci., 10, 7–18, https://doi.org/10.5194/nhess-10-7-2010, 2010a. 3. Akhoondzadeh, M., Parrot, M., and Saradjian, M. R.: Akhoondzadeh, M., Parrot, M., and Saradjian, M. R.: Investigation of VLF and HF waves showing seismo-ionospheric anomalies induced by the 29 September 2009 Samoa earthquake ($M_w=8.1$), Nat. Hazards Earth Syst. Sci., 10, 1061–1067, https://doi.org/10.5194/nhess-10-1061-2010, 2010b. 4. Berthelier, J. J., Godefroy, M., Leblanc, F., Malingre, M., Menvielle, M., Lagoutte, D., Brochot, J. Y, Colin, F., Elie, F., Legendre, C., Zamora, P, Benoist, D., Chapuis, Y., Artru, J., and Pfaff, R.: ICE, the electric field experiment on DEMETER, Planet. Space Sci., 54, 456–471, 2006. 5. Chmyrev, V. M., Isaev, N. V., Bilichenko, S. V., and Stanev, G.: Observation by space-borne detectors of electric fields and hydromagnetic waves in the ionosphere over an earthquake centre, Phys. Earth Planet. Int., 57, 110–114, 1989.
Cited by
12 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|