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Authors: Masci, F.* 
Thomas, J. N.* 
Title: Comment on “Temporal and spatial precursors in ionospheric total electron content of the 16 October 1999 Mw7.1 Hector Mine earthquake”, by Su et al. (2013)
Issue Date: 8-Aug-2014
Series/Report no.: /119(2014)
DOI: 10.1002/ 2014JA019896
Keywords: Ionosphere
Total Electron Content
Earthquake precursors
Short-term earthquake prediction
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous 
05. General::05.07. Space and Planetary sciences::05.07.99. General or miscellaneous 
05. General::05.07. Space and Planetary sciences::05.07.01. Solar-terrestrial interaction 
Abstract: We review the recent paper by Su et al. [2013]. Using Global Position System (GPS) and Global Ionospheric Maps (GIM) data, Su et al. claimed to have found ionospheric precursors a few days before the 16 October 1999 Hector Mine, California earthquake. They proposed that this type of analysis of ionospheric data may be useful for locating forthcoming large earthquakes. In this Comment, we reexamine these data and show that ionospheric anomalies reported by Su et al. were not precursors to the Hector Mine earthquake. Therefore, their proposed analysis is not useful in the context of earthquake prediction.
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