Waveform inversion for D″ structure beneath northern Asia using Hi-net tiltmeter data

Autor:	Robert J. Geller, Kenji Kawai, Shutaro Sekine, Nobuaki Fuji
Rok vydání:	2009
Předmět:	Cosmic microwave background Wave velocity Tiltmeter Physics::Geophysics Geophysics Shear (geology) Core–mantle boundary General Earth and Planetary Sciences Waveform Physical geography Waveform inversion Far East Physics::Atmospheric and Oceanic Physics Geology Seismology
Zdroj:	Geophysical Research Letters. 36
ISSN:	0094-8276
DOI:	10.1029/2009gl039651
Popis:	[1] We invert shear-wave waveform data for the radial variation of (isotropic) shear-velocity in D″ beneath Northern Asia. We reduce source and receiver effects by using data for intermediate and deep events beneath Italy and Japan recorded respectively at stations in East Asia and Europe. Relative to PREM, we find a significantly higher S-wave velocity in the depth range from 150 to 300 km above the core-mantle boundary (CMB) and a slightly lower S-wave velocity in the depth range 0–150 km above the CMB. As our previous studies of D″ structure beneath Central America and the Arctic obtained similar S-wave velocity models, we suggest that this pattern of vertical dependence of shear wave velocity in D″ may be a general phenomenon, at least in relatively cold regions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::a7e3664c1e6201a0633301aaefa2a107 https://doi.org/10.1029/2009gl039651 Zobrazit plný text záznamu Plný text