Novel anisotropic teleseismic body-wave tomography code AniTomo to illuminate heterogeneous anisotropic upper mantle: Part I - Theory and inversion tuning with realistic synthetic data

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F18%3A00493309" target="_blank" >RIV/67985530:_____/18:00493309 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1093/gji/ggy296" target="_blank" >http://dx.doi.org/10.1093/gji/ggy296</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/gji/ggy296" target="_blank" >10.1093/gji/ggy296</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Novel anisotropic teleseismic body-wave tomography code AniTomo to illuminate heterogeneous anisotropic upper mantle: Part I - Theory and inversion tuning with realistic synthetic data

Popis výsledku v původním jazyce

Considering only isotropic wave propagation and neglecting anisotropy in teleseismic tomography studies is a simplification obviously incongruous with current understanding of the mantle-lithosphere plate dynamics. Therefore, we have developed a code for anisotropic-teleseismic tomography (AniTomo), which allows to invert relative traveltime residuals of teleseismic P waves simultaneously for coupled anisotropic-isotropic P-wave velocity models of the upper mantle. Due to a more complex anisotropic propagation of S waves, the AniTomo is applicable only to P-wave data. Weak hexagonal anisotropy together with isotropic velocity heterogeneities are interpreted as a cause of the observed P-wave traveltime residuals. Moreover, the axis of the hexagonal symmetry can be oriented freely in all directions, which represents a unique approach among recent approaches that usually incorporate only azimuthal or radial anisotropy into the body-wave tomography.nApart from outlining the theoretical background of AniTomo, we examine various aspects coming along with anisotropic tomography such as choice of a set of initial anisotropic models and setup of parameters controlling the inversion. Synthetic testing furthermore allows investigation of the well-known trade-off between effects of P-wave anisotropy and lateral variations of isotropic velocity. The target synthetic models are designed to schematically represent different heterogeneous anisotropic structures of the upper mantle. Considering realistic distributions of stations and events at teleseismic distances, a separation of seismic anisotropy and isotropic velocity heterogeneities is plausible and a stable output model can be achieved within a few iterations. Careful testing of the new code on synthetics, concentrating on its functionality, strength and weaknesses, is a necessary step before AniTomo is applied to real data sets.

Název v anglickém jazyce

Novel anisotropic teleseismic body-wave tomography code AniTomo to illuminate heterogeneous anisotropic upper mantle: Part I - Theory and inversion tuning with realistic synthetic data

Popis výsledku anglicky

Considering only isotropic wave propagation and neglecting anisotropy in teleseismic tomography studies is a simplification obviously incongruous with current understanding of the mantle-lithosphere plate dynamics. Therefore, we have developed a code for anisotropic-teleseismic tomography (AniTomo), which allows to invert relative traveltime residuals of teleseismic P waves simultaneously for coupled anisotropic-isotropic P-wave velocity models of the upper mantle. Due to a more complex anisotropic propagation of S waves, the AniTomo is applicable only to P-wave data. Weak hexagonal anisotropy together with isotropic velocity heterogeneities are interpreted as a cause of the observed P-wave traveltime residuals. Moreover, the axis of the hexagonal symmetry can be oriented freely in all directions, which represents a unique approach among recent approaches that usually incorporate only azimuthal or radial anisotropy into the body-wave tomography.nApart from outlining the theoretical background of AniTomo, we examine various aspects coming along with anisotropic tomography such as choice of a set of initial anisotropic models and setup of parameters controlling the inversion. Synthetic testing furthermore allows investigation of the well-known trade-off between effects of P-wave anisotropy and lateral variations of isotropic velocity. The target synthetic models are designed to schematically represent different heterogeneous anisotropic structures of the upper mantle. Considering realistic distributions of stations and events at teleseismic distances, a separation of seismic anisotropy and isotropic velocity heterogeneities is plausible and a stable output model can be achieved within a few iterations. Careful testing of the new code on synthetics, concentrating on its functionality, strength and weaknesses, is a necessary step before AniTomo is applied to real data sets.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10507 - Volcanology

Projekt

<a href="/cs/project/EF16_013%2F0001800" target="_blank" >EF16_013/0001800: Distribuovaný systém observatorních a terénních měření geofyzikálních polí</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysical Journal International

ISSN

0956-540X

e-ISSN

—

Svazek periodika

215

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

22

Strana od-do

524-545

Kód UT WoS článku

000448242600032

EID výsledku v databázi Scopus

2-s2.0-85055349077