detection of gravity changes before powerful earthquakes in grace satellite observations

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ID: 215407
2014
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Abstract

The variations of gravity field have been analyzed in this article, in order to find disturbances in the vicinity of recent great earthquakes epicenters including Chile (February 27, 2010), Tohoku-Oki (March 11, 2011) and Indian Ocean (April 11, 2012) prior to the events. For this purpose, the 10 years long time series of gravitational gradient components obtained from weekly Gravity Recovery And Climate Experiment (GRACE) solutions have been used. Some of gravitational gradient components are independent to GRACE stripy error and amplify high frequency components of gravity field. Therefore that preseismic activity can be better illustrated. The interquartile method has been used to construct the higher and lower bounds in time series to detect outlying solution outside the bounds associated with impending earthquakes. Afterwards, Nonlinear Auto-Regressive models with eXogenous inputs (NARX) neural network has been proposed in the detection process of prominent gravity field anomalies prior the earthquakes. Both methods detect considerable anomalous occurrences during 2-5 weeks prior to the earthquakes. Our results statistics show that the anomalous deviations before the earthquakes have different signs and amplitudes at different cases.

Reference Key
shahrisvand2014annalsdetection Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Mohsen Shahrisvand;Mehdi Akhoondzadeh;Mohammad Ali Sharifi
Journal desalination
Year 2014
DOI
10.4401/ag-6612
URL
http://www.annalsofgeophysics.eu/index.php/annals/article/view/6612
Keywords
meteorology earthquake ionosphere gravity grace cosmic physics climatologygeophysics

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