On the coseismic ionospheric disturbances after the Nepal Mw7.8 earthquake on April 25, 2015 using GNSS observations

作者:Chen, P (Chen, Peng)^{[ 1 ]} ; Yao, YB (Yao, Yibin)^{[ 2,3 ]} ; Yao, WQ (Yao, Wanqiang)^{[ 1 ]}

ADVANCES IN SPACE RESEARCH

DOI: 10.1016/j.asr.2016.09.021

出版年: JAN 1 2017

摘要

Nepal Mw7.8 earthquake occurred at 06:11:26 UTC on April 25, 2015. The epicenter was located at 28.147 degrees N, 84.708 degrees E, with the focal depth of 15 km. In this paper, the coseismic ionospheric disturbances were analyzed using Vertical Total Electron Content from Global Navigation Satellite System (GNSS) observations obtained from 309 continuous tracking stations around the epicenter. The results show that significant ionospheric disturbances occurred within 10 mm after the earthquake. The maximum anomaly reached 1.34 TECU; the maximum duration was 10 mm; the farthest anomaly was found beyond 3000 km from the epicenter. The ionospheric response was attributed to two modes: shock acoustic waves and Rayleigh wave. Within 500 km from the epicenter, ionosphere anomaly was induced by both waves, with average propagating speed of 0.61 and 1.62 km/s, respectively. With increasing epicentral distance, the ionospheric disturbances caused by acoustic waves gradually weakened, whereas Rayleigh waves induced ionosphere disturbances reached up to 3000 km from the epicenter. The propagation speed of Rayleigh waves gradually increased to 2.74 km/s while the distance from the epicenter to sub-ionospheric point was over 1500 km. The occurrence of the disturbances appeared strong directivity. The amplitudes of the disturbances were large to the south of the epicenter. In contrast, to the northwest of the epicenter, few disturbances were observed, and the amplitudes of these disturbances were small. In general, the amplitude of the anomaly decreased with increasing epicentral distance. However, the amplitude of the anomaly increased at 1500-2500 km to the northeast of the epicenter. (C) 2016 COSPAR. Published by Elsevier Ltd. All rights reserved.

作者关键词:GPS; Total electron content; Coseismic ionospheric disturbances

KeyWords Plus:ELECTRON-CONTENT OBSERVATION; TOHOKU EARTHQUAKE; PACIFIC COAST; SIGNATURE; VELOCITY; TEC

通讯作者地址: Chen, P (通讯作者)

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电子邮件地址:chenpeng0123@gmail.com

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ELSEVIER SCI LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND

研究方向:Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences

Web of Science 类别:Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences

文献类型:Article

语种:English

入藏号: WOS:000392769500010

ISSN: 0273-1177

eISSN: 1879-1948

Impact Factor (影响因子): 1.409