On the onset of ionospheric precursors 40 min before strong earthquakes

被引:44
作者
Masci, F. [1 ]
Thomas, J. N. [2 ,3 ,4 ]
Villani, F. [1 ]
Secan, J. A. [2 ]
Rivera, N. [3 ]
机构
[1] Ist Nazl Geofis & Vulcanol, Laquila, Italy
[2] NorthWest Res Associates, Redmond, WA USA
[3] DigiPen Inst Technol, Dept Elect & Comp Engn, Redmond, WA USA
[4] Univ Washington, Dept Earth & Space Sci, Seattle, WA 98195 USA
关键词
earthquake precursors; total electron content; ionosphere; short-term earthquake prediction; TOHOKU-OKI EARTHQUAKE; TOTAL ELECTRON-CONTENT; PACIFIC COAST; GPS DETECTION; 2007; BENGKULU; TEC RESPONSE; SUMATRA; TSUNAMI; SOLAR; DISTURBANCES;
D O I
10.1002/2014JA020822
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Heki (2011) and Heki and Enomoto (2013) claimed that anomalous, yet similar, increases of ionospheric total electron content (TEC) started similar to 40 min prior to the 2011 Tohoku-Oki, as well as before other M-w>8 earthquakes. The authors concluded that the reported TEC anomalies were likely related to the pending earthquakes, suggesting also that TEC monitoring may be useful for future earthquake prediction. Here we carefully examine the findings of Heki (2011) and Heki and Enomoto (2013) by performing new analyses of the same TEC data. Our interpretation is that the 40 min onset of the ionospheric precursors is an artifact induced by the definition of the reference line adopted in analyzing TEC variations. We also discuss this repeatability in the tectonic and geodynamic context of the earthquakes. By performing a Superimposed Epoch Analysis of TEC data, we show that, however, the TEC increase reported by Heki (2011) was not particularly anomalous. We conclude that the TEC precursors reported by Heki (2011) and Heki and Enomoto (2013) are not useful for developing short-term earthquake prediction capabilities.
引用
收藏
页码:1383 / 1393
页数:11
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