TY - JOUR
T1 - Normal mode detection and splitting after Sumatra-Andaman earthquake
AU - Abd El-Gelil, Mahmoud
AU - Pagiatakis, Spiros
AU - El-Rabbany, Ahmed
N1 - Funding Information:
This research was financially supported by Ryerson University Post Doctoral Fellowship for the first author and the Natural Sciences and Engineering Research Council (NSERC) of Canada, the GEOIDE National Centre of Excellence of the second and third authors. We thank the managers of the GGP stations for making the SG data available for this research. The first anonymous reviewer and Professor Sun Heping provided very useful comments and suggestions that improved significantly the manuscript.
PY - 2010/8
Y1 - 2010/8
N2 - 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.
AB - 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.
KW - Earth free oscillations
KW - Least squares spectrum
KW - Normal mode
KW - Superconducting gravimeter
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U2 - 10.1016/j.jog.2010.02.003
DO - 10.1016/j.jog.2010.02.003
M3 - Article
AN - SCOPUS:77955585432
VL - 50
SP - 49
EP - 56
JO - Journal of Geodynamics
JF - Journal of Geodynamics
SN - 0264-3707
IS - 2
ER -