Anisotropie svrchního pláště pod Severními Apeninami z dat mezinárodního experimentu RETREAT (Itálie)

Název práce: Anisotropie svrchního pláště pod Severními Apeninami z dat mezinárodního experimentu RETREAT (Itálie) Autor: Helena Munzarová Katedra / Ústav: Katedra geofyziky Vedoucí diplomové práce: RNDr. František Gallovič, Ph.D. Katedra geofyziky Konzultant diplomové práce: RNDr. Jaroslava Plomerová, DrSc. Geofyzikální ústav Akademie věd ČR Abstrakt: V této diplomové práci zpracováváme data mezinárodního pasivního seismologického experimentu RETREAT (2003-2006) ve snaze přispět k poznání struktury svrchního pláště pod Severními Apeninami. V Severních Apeninách dochází k aktivní kolizi mezi Tyrhénskou a Adriatickou litosférickou deskou (zanořující se západním směrem). Kolize je doprovázená zpětným pohybem kolizního příkopu ve východním směru. Směrová závislost odchylek v časech šíření vln P, společně se změnami polarizací rychlých štěpených střižných vln indikují, že pozorovaná anisotropie seismických rychlostí je odrazem fosilní anisotropie uvnitř plášťové litosféry a anisotropie, vznikající v důsledku aktuálního tečení v astenosféře. Kontinentální Adriatickou desku je možné rozdělit přinejmenším na dvě oblasti s vlastní fosilní orientací anisotropní struktury. Rovněž jsme vyhodnocovali provázanost seismické anisotropie a heterogenit, zde reprezentovaných vysokorychlostní zanořující se Adriatickou deskou....Title: Anisotropy of the upper mantle under the Northern Apennines based on data from the international experiment RETREAT (Italy) Author: Helena Munzarová Department: Department of Geophysics Supervisor of the master thesis: RNDr. František Gallovič, Ph.D. Department of Geophysics Consultant of the master thesis: RNDr. Jaroslava Plomerová, DrSc. Institute of Geophysics, Czech Academy of Sciences Abstract: In this master thesis, we process data recorded during the passive seismic experiment RETREAT (2003-2006) in the Northern Apennines with the aim to explore the upper mantle structure in the region. Active orogeny in the Northern Apennines relates to the collision of the Tyrrhenian and Adriatic (subducting westward) plates and is accompanied by an eastward retreat of the trench. Directional dependences of P-wave travel-time deviations together with variations of the fast split polarization azimuths of teleseismic SKS waves are derived from data recorded during experiment RETREAT. Both the fossil anisotropic structure in the mantle lithosphere and the anisotropy due to the present-day flow in the sub-lithospheric mantle are sources of the observed velocity-anisotropy patterns. Thick continental Adriatic plate can be divided into at least two sub-regions with their own fossil fabrics. We have also tried to...Department of GeophysicsKatedra geofyzikyFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult

Automatic picking seismic wave onsets recorded during passive experiments (RETREAT, Italy)

Department of GeophysicsKatedra geofyzikyFaculty of Mathematics and PhysicsMatematicko-fyzikální fakult

Anisotropie svrchního pláště pod Severními Apeninami z dat mezinárodního experimentu RETREAT (Itálie)

Title: Anisotropy of the upper mantle under the Northern Apennines based on data from the international experiment RETREAT (Italy) Author: Helena Munzarová Department: Department of Geophysics Supervisor of the master thesis: RNDr. František Gallovič, Ph.D. Department of Geophysics Consultant of the master thesis: RNDr. Jaroslava Plomerová, DrSc. Institute of Geophysics, Czech Academy of Sciences Abstract: In this master thesis, we process data recorded during the passive seismic experiment RETREAT (2003-2006) in the Northern Apennines with the aim to explore the upper mantle structure in the region. Active orogeny in the Northern Apennines relates to the collision of the Tyrrhenian and Adriatic (subducting westward) plates and is accompanied by an eastward retreat of the trench. Directional dependences of P-wave travel-time deviations together with variations of the fast split polarization azimuths of teleseismic SKS waves are derived from data recorded during experiment RETREAT. Both the fossil anisotropic structure in the mantle lithosphere and the anisotropy due to the present-day flow in the sub-lithospheric mantle are sources of the observed velocity-anisotropy patterns. Thick continental Adriatic plate can be divided into at least two sub-regions with their own fossil fabrics. We have also tried to..

Design interpreter of the Forth language adapted for definitions of new DSLs

Tato práce je zaměřena na návrh interpretu jazyka Forth, který bude sloužit jako nástroj pro návrh interních doménově specifických jazyků. Součástí práce je analýza vybraných interpretů jazyka Forth, seznámení s doménově specifickými jazyky, popis architektury interpretu a příručka pro programátory, kteří budou s interpretem pracovat.This thesis is focused on the design of the interpreter of the programming language Forth. This interpreter will be used as a tool for the design of internal domain-specific languages. The thesis contains an analysis of some interpreters of Forth, introduction to domain-specific languages, description of the architecture of the interpreter and a manual for programmers, who will work with the interpreter

Design and implementation of the integrated testing tool

The purpose of this thesis is to design and implement integration interface, which represents the core of the Integrated testing tool. Integrated testing tool provides support in the whole process of software testing. This support involves requirement specification and management of the corresponding tests, bug management and creation and execution of automated testing scripts. Integrated testing tool uses existing open-source tools to provide this functionality. The communication of these tools is provided by the integration interface, implementation of which is the purpose of this thesis. Currently there is no so complex open-source solution in the testing area, Integrated testing tool endeavours to fill this gap. The tool is being developed within the activity of the competence centre Software Quality Assurance at the University of Economics in Prague. The analytical phase of the development is described in the diploma thesis written by Bc. Jan Ženíšek Project of the development of Integrated testing tool

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

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. Apart 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.ISSN:0956-540XISSN:1365-246

Novel anisotropic teleseismic body-wave tomography code AniTomo to illuminate heterogeneous anisotropic upper mantle: Part II - Application to data of passive seismic experiment LAPNET in northern Fennoscandia

Seismic anisotropy provides a unique constraint on the past and present dynamics of the lithosphere and sublithospheric mantle. To contribute to studies of large-scale tectonic fabric, we have developed code AniTomo for regional anisotropic tomography. AniTomo allows us to invert simultaneously relative traveltime residuals of teleseismic P waves for 3-D distribution of isotropic-velocity perturbations and velocity anisotropy in the upper mantle. Weak hexagonal anisotropy with the symmetry axis oriented generally in 3-D is considered. The first application of novel code AniTomo to data from passive seismic experiment LAPNET results in a model of anisotropic velocities of the upper mantle beneath northern Fennoscandia. We have opted for northern Fennoscandia for the first application because it is a tectonically stable Precambrian region with a thick anisotropic mantle lithosphere without significant thermal heterogeneities. We carefully analyse the distribution of the rays to limit the fully anisotropic inversion only to the volume with the sufficient directional ray coverage. Capability of the given inversion setup to reveal large-scale anisotropic structures in the upper mantle is documented by a series of synthetic tests. The strongest anisotropy and the largest velocity perturbations concentrate at depths corresponding to the mantle lithosphere, while in deeper parts of the tomographic model, the lateral variations are insignificant. We delimit regions of laterally and vertically consistent anisotropy in the mantle–lithospheric part of the model. We attribute the retrieved domain-like anisotropic structure of the mantle lithosphere in northern Fennoscandia to preserved fossil fabrics of the Archean microplates, accreted during the Precambrian orogenic processes.ISSN:0956-540XISSN:1365-246

Cenozoic volcanism in the Bohemian Massif in the context of P‐ and S‐velocity high‐resolution teleseismic tomography of the upper mantle

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