The Pre-earthquake Ionosphere Anomaly of the 2015 Nepal Earthquake

doi:10.11947/j.AGCS.2016.20150384

Abstract

Abstract: An ionospheric anomaly detection method based on singular spectrum analysis is introduced firstly.With the TEC time sequence of GIM grid points around the Nepal earthquake epicenter, the positive ionospheric anomalies are determined on 23 April around the eastern region of the epicenter. Using the two-dimensional ionospheric anomalies map, further analysis is taken to comfirm the ionospheric positive anomaly area distributing from 25°N to 37.5°N, 90°E to 110°E, and the anomaly time ranging UT9:00 to UT15:00 on 23 April, 2015. The data of crustal movement observation network of China issued to analyze the STEC fluctuation changes of IPP(ionosphere piece piont) trajectories in the abnormal area, and it is found that on 23 April the STEC values of IPP trajectories passing through the abnormal area are obviously larger than the ones a few days after and before the earthquake time, and returned to the normal level after leaving the abnormal area. Lastly, the CIT (computerized ionosphere tomography) method is used to present the 3D ionospheric anomalies distribution, and it is found that, at UT9:00-UT15:00 on 23 April the peak of ionospheric positive anomaly on the eastern region of the epicenter is approximately at (30°N, 115°E), with the altitude ranging from 100 to 500 km. Also the anomalous peak varies with height is consistent with ionosphere density vertical distribution.

Key words: seismic-ionospheric disturbance, singular spectrum analysis, STEC, CIT

CLC Number:

P228

YAO Yibin, ZHAI Changzhi, KONG Jian, LIU Lei. The Pre-earthquake Ionosphere Anomaly of the 2015 Nepal Earthquake[J]. Acta Geodaetica et Cartographica Sinica, 2016, 45(4): 385-395.

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