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High-resolution analysis of the gravest seismic normal modes after the 2004 Mw = 9 Sumatra earthquake using superconducting gravimeter data

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dc.contributor.authorRosat, S
dc.contributor.authorSato, Tadahiro
dc.contributor.authorImanishi, Yuichi
dc.contributor.authorHinderer, J
dc.contributor.authorTamura, Yoshiaki
dc.contributor.authorMcQueen, Herbert
dc.contributor.authorOhashi, M
dc.date.accessioned2015-12-13T22:59:35Z
dc.date.issued2005
dc.date.updated2015-12-12T07:29:29Z
dc.description.abstractThe Mw > 9 Sumatra-Andaman earthquake on December 26, 2004 has strongly excited the low-frequency seismic modes and is a unique opportunity to improve the frequency and damping measurements of the gravest seismic modes. The precise estimation of the frequency splitting of the seismic modes below 1 mHz is needed to improve 1D-density models of the Earth. From this event, 2S1 is observed for the first time without any stacking on both SG (Superconducting Gravimeter) and seismic records. We report here analyses of SG data obtained from 11 sites. The spectra of SG records clearly show the splitting of 0S2 into 5 completely resolved singlets and the splitting of 0S3 into 7 singlets at individual stations. The present results demonstrate that SGs provide high quality data for a precise analysis of the low-frequency seismic modes.
dc.identifier.issn0094-8276
dc.identifier.urihttp://hdl.handle.net/1885/83875
dc.publisherAmerican Geophysical Union
dc.sourceGeophysical Research Letters
dc.subjectKeywords: Earthquakes; Gravimeters; Mathematical models; Seismic waves; Spectrum analysis; Frequency splitting analysis; Gravest seismic modes; Low frequency seismic modes; Seismology; earthquake; gravimetry; monitoring system; resolution; seismic data; Asia; Easte
dc.titleHigh-resolution analysis of the gravest seismic normal modes after the 2004 Mw = 9 Sumatra earthquake using superconducting gravimeter data
dc.typeJournal article
local.bibliographicCitation.lastpage4
local.bibliographicCitation.startpage1
local.contributor.affiliationRosat, S, National Astronomical Observatory of Japan
local.contributor.affiliationSato, Tadahiro, National Astronomical Observatory of Japan
local.contributor.affiliationImanishi, Yuichi, University of Tokyo
local.contributor.affiliationHinderer, J, Institut de Physique du Globe de Strasbourg
local.contributor.affiliationTamura, Yoshiaki, National Astronomical Observatory of Japan
local.contributor.affiliationMcQueen, Herbert, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationOhashi, M, University of Tokyo
local.contributor.authoruidMcQueen, Herbert, u8102941
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor040403 - Geophysical Fluid Dynamics
local.identifier.ariespublicationMigratedxPub12151
local.identifier.citationvolume32
local.identifier.doi10.1029/2005GL023128
local.identifier.scopusID2-s2.0-24944446649
local.type.statusPublished Version

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