Normal mode detection and splitting after Sumatra-Andaman earthquake

Mahmoud Abd El-Gelil, Spiros Pagiatakis, Ahmed El-Rabbany

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Apart from life loss and damages which earthquakes cause, their signature in the collected data either seismic and/or gravity enables us to define their location and dislocation (i.e., geometric parameters), time of occurrence, and magnitude. In addition, the Earth's interior physical parameters, such as density profile and anelasticity can be defined. Gravity data contribute additional knowledge about the Earth's interior through careful analyses of superconducting gravimeter (SG) records particularly after strong earthquakes. In this paper, SG data recorded after the Sumatra-Andaman earthquake in December 26, 2004 at eight SG stations, are used to investigate the properties of the long-period seismic modes: their frequencies, amplitudes, and quality factors. These parameters are estimated very precisely in this study for the spheroidal modes S00, S02 and S03. In addition, for the first time we observe the toroidal modes T14 and T15.

Original languageEnglish
Pages (from-to)49-56
Number of pages8
JournalJournal of Geodynamics
Volume50
Issue number2
DOIs
Publication statusPublished - Aug 2010

Fingerprint

gravimeters
earthquakes
earthquake
earthquake damage
anelasticity
gravity
gravitation
dislocation
Q factors
seismic data
stations
signatures
occurrences
causes
profiles
detection
parameter

Keywords

  • Earth free oscillations
  • Least squares spectrum
  • Normal mode
  • Superconducting gravimeter

ASJC Scopus subject areas

  • Earth-Surface Processes
  • Geophysics

Cite this

Normal mode detection and splitting after Sumatra-Andaman earthquake. / Abd El-Gelil, Mahmoud; Pagiatakis, Spiros; El-Rabbany, Ahmed.

In: Journal of Geodynamics, Vol. 50, No. 2, 08.2010, p. 49-56.

Research output: Contribution to journalArticle

Abd El-Gelil, Mahmoud ; Pagiatakis, Spiros ; El-Rabbany, Ahmed. / Normal mode detection and splitting after Sumatra-Andaman earthquake. In: Journal of Geodynamics. 2010 ; Vol. 50, No. 2. pp. 49-56.
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