Ionospheric variations before some large earthquakes over Sumatra

Research output: Contribution to journalArticle

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Abstract

The paper investigates the ionospheric variations before some large earthquakes that occurred during 2004-2007 in Sumatra using GPS and CHAMP data. The TEC shows the occurrence of positive and negative anomalies detected within a few hours to 6 days before the earthquakes. These anomalies mostly occur during the daytime hours between 4 and 17 LT. The TEC anomalies are mostly consistent with the CHAMP satellite electron density data. The electron density analysis over the 28 March 2005 earthquake epicenter shows that an equatorial anomaly modification took place a few days before the event. The modification took shape in the form of crest amplification during the daytime. The comparison between the TEC and electron density measurements during very quiet geomagnetic conditions is shown to be a useful indicator of a forthcoming earthquake.

Original languageEnglish
Pages (from-to)597-611
Number of pages15
JournalNatural Hazards and Earth System Science
Volume11
Issue number2
DOIs
Publication statusPublished - 2011

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electron density
anomaly
earthquake
CHAMP
earthquake epicenter
amplification
GPS
indicator
analysis
comparison

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

Cite this

Ionospheric variations before some large earthquakes over Sumatra. / Hasbi, Alina Marie; Mohd Ali, M. A.; Misran, Norbahiah.

In: Natural Hazards and Earth System Science, Vol. 11, No. 2, 2011, p. 597-611.

Research output: Contribution to journalArticle

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