Browsing by Subject "EARTH'S INTERIOR"

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IMPROVEMENT OF SEISMOLOGICAL EARTH MODELS BY USING DATA WEIGHTING IN WAVEFORM INVERSION

Takeuchi N.; Kobayashi M. (2004)

We present a new method for data weighting in waveform inversion to improve the obtained seismological earth model. We define 'sensitivity' as an index to show the homogeneity of the waveform inversion data set. The ...
MANTLE CIRCULATION MODELS WITH VARIATIONAL DATA ASSIMILATION: INFERRING PAST MANTLE FLOW AND STRUCTURE FROM PLATE MOTION HISTORIES AND SEISMIC TOMOGRAPHY

Bunge H.P.; Hagelberg C.R.; Travis B.J. (2003)

Mantle convection models require an initial condition some time in the past. Because this initial condition is unknown for Earth, we cannot infer the geological evolution of mantle flow from forward mantle convection ...
NOBLE GAS SIGNATURES IN THE EARTH'S INTERIOR-COUPLED OR DECOUPLED BEHAVIOUR AMONG EACH ISOTOPE SYSTEMATICS AND PROBLEMS RELATED TO THEIR IMPLICATION

Kaneoka I. (1998)

In order to conjecture the degassing state of the Earth's interior, many kinds of noble gas systematics are used to characterize the source materials in the Earth's interior. Although some systematics show clear trends, ...
PP-P DIFFERENTIAL TRAVELTIME MEASUREMENT WITH CRUSTAL CORRECTION

Obayashi M.; Suetsugu D.; Fukao Y. (2004)

PP-P differential traveltime data are useful for constraining the seismic structure of the upper mantle. The cross-correlation method has been used for these measurements, whereby a synthetic PP waveform is constructed ...

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