Coseismic ionospheric disturbance of the large strike-slip earthquakes in North Sumatra in 2012: Mw dependence of the disturbance amplitudes

被引：91

作者：

Cahyadi, Mokhamad Nur ^{[1
,2
]}

Heki, Kosuke ^{[1
]}

机构：

[1] Hokkaido Univ, Dept Nat Hist Sci, Sapporo, Hokkaido, Japan

[2] Inst Teknol Sepuluh Nopember ITS, Geomat Engn Dept, Surabaya, Indonesia

来源：

GEOPHYSICAL JOURNAL INTERNATIONAL | 2015年 / 200卷 / 01期

关键词：

Acoustic-gravity waves; Ionosphere/atmosphere interactions; Acoustic properties; ELECTRON-CONTENT OBSERVATION; TOHOKU EARTHQUAKE; PACIFIC COAST; ACOUSTIC-RESONANCE; GPS DETECTION; TEC RESPONSE; ATMOSPHERE; VELOCITY; SHOCK;

D O I：

10.1093/gji/ggu343

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

We studied ionospheric responses to the 2012 April 11 M-w 8.6 North Sumatra earthquake using total electron content (TEC) measurements with the regional Global Navigation Satellite System network. This earthquake ruptured the oceanic lithosphere off the Indian Ocean coast of North Sumatra, and is known as the largest strike-slip earthquake ever recorded. Coseismic ionospheric disturbances (CIDs) with rapid TEC enhancement of a few TEC units propagated northward with a speed of acoustic waves (similar to 1 kms(-1)). Resonant atmospheric oscillation with a frequency similar to 4 mHz have been found as monochromatic oscillation of TEC lasting for an hour after the main shock and the largest aftershock. We compared CID amplitudes of 21 earthquakes world-wide with moment magnitudes (M-w) 6.6-9.2. They roughly obeyed a law such that CID amplitude increases by two orders of magnitude for the M-w increase of three. The 2012 North Sumatra earthquakes slightly deviated negatively from the trend possibly reflecting their strike-slip mechanisms, that is small vertical crustal movements for their magnitudes.

引用

页码：116 / 129

页数：14

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