Barbara Romanowicz
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View article: Upwellings and Mantle Ponding Zones in the Lower Mantle Transition Zone (660–1000 km)
Upwellings and Mantle Ponding Zones in the Lower Mantle Transition Zone (660–1000 km) Open
Convective instabilities at various boundary layers in the earth’s mantle—including the core–mantle boundary, mantle transition zone and lithosphere-asthenosphere boundary— result in upwellings (mantle plumes) and downwellings (subducting …
View article: Patterns of deformation in the deepest mantle linked to ancient subduction
Patterns of deformation in the deepest mantle linked to ancient subduction Open
Shear wave speeds in Earth's deepest mantle (D") that vary with wave propagation and polarization direction -- a property called seismic anisotropy -- offer insights into mantle convection. To date, global patterns of D" anisotropy have be…
View article: Efficient hybrid numerical modeling of the seismic wavefield in the presence of solid-fluid boundaries
Efficient hybrid numerical modeling of the seismic wavefield in the presence of solid-fluid boundaries Open
Applying full-waveform methods to image small-scale structures of geophysical interest buried within the Earth requires the computation of the seismic wavefield over large distances compared to the target wavelengths. This represents a con…
View article: Deep mantle plumes feeding periodic alignments of asthenospheric fingers beneath the central and southern Atlantic Ocean
Deep mantle plumes feeding periodic alignments of asthenospheric fingers beneath the central and southern Atlantic Ocean Open
High-resolution full waveform seismic tomography of the Earth’s mantle beneath the south and central Atlantic Ocean brings into focus a series of asthenospheric low shear velocity channels, or “fingers” on both sides of the southern and ce…
View article: On accounting for the effects of crust and uppermost mantle structure in global scale full-waveform inversion
On accounting for the effects of crust and uppermost mantle structure in global scale full-waveform inversion Open
SUMMARY Fundamental mode surface wave data have often been used to construct global shear velocity models of the upper mantle under the so-called ‘path average approximation’, an efficient approach from the computational point of view. Wit…
View article: Partial melt in mesoscale upper mantle upwellings beneath ocean basins
Partial melt in mesoscale upper mantle upwellings beneath ocean basins Open
International audience
View article: Fibre optic sensing of submarine gravity flows
Fibre optic sensing of submarine gravity flows Open
Fibre optic sensing has emerged as a powerful technology for detecting energetic processes that modify the seafloor, such as earthquakes and ocean currents. Fibre optic technologies have a transformative potential in seafloor geomorphology…
View article: Seismic Tomography 2024
Seismic Tomography 2024 Open
Seismic tomography is the most abundant source of information about the internal structure of the Earth at scales ranging from a few meters to thousands of kilometers. It constrains the properties of active volcanoes, earthquake fault zone…
View article: Introduction to the Distributional Finite Difference Method for 3D Seismic Wave Propagation and Comparison With the Spectral Element Method
Introduction to the Distributional Finite Difference Method for 3D Seismic Wave Propagation and Comparison With the Spectral Element Method Open
We have extended the distributional finite difference method (DFDM) to simulate the seismic‐wave propagation in 3D regional earth models. DFDM shares similarities to the discontinuous finite element method on a global scale and to the fini…
View article: Effects of mantle structure on models of seismic anisotropy in the inner core
Effects of mantle structure on models of seismic anisotropy in the inner core Open
Mapping inner core (IC) seismic anisotropy at high resolution provides important insight on the growth of the inner core through time, its internal dynamics, and its role in the production of the geodynamo. Since the discovery of IC anisot…
View article: Full waveform anisotropic tomography of the transition zone beneath the south west Pacific
Full waveform anisotropic tomography of the transition zone beneath the south west Pacific Open
The presence of ponding slabs at the base of the mantle transition zone (600-700 km) has been well known for a long time and can be explained by the changes in material properties related to phase changes around this depth. However, recent…
View article: Mantle plumes imaged by seismic full waveform inversion: from the core-mantle-boundary to surface hotspots
Mantle plumes imaged by seismic full waveform inversion: from the core-mantle-boundary to surface hotspots Open
With recent progress in resolution in global seismic mantle imaging provided by numerical wavefield computations using the Spectral Element Method and full waveform inversion, Jason Morgan’s suggestion from over 50 years ago that man…
View article: Efficient hybrid numerical modeling of the seismic wavefield in the presence of solid-fluid boundaries
Efficient hybrid numerical modeling of the seismic wavefield in the presence of solid-fluid boundaries Open
Applying full-waveform methods to image small-scale structures of geophysical interest buried within the Earth requires the computation of the seismic wavefield over large distances compared to the target wavelengths. This represents a con…
View article: 2-D seismic wave propagation using the distributional finite-difference method: further developments and potential for global seismology
2-D seismic wave propagation using the distributional finite-difference method: further developments and potential for global seismology Open
SUMMARY We present a time-domain distributional finite-difference scheme based on the Lebedev staggered grid for the numerical simulation of wave propagation in acoustic and elastic media. The central aspect of the proposed method is the r…
View article: Accelerating full-waveform inversion using source stacking: synthetic experiments at the global scale in a realistic 3-D earth model
Accelerating full-waveform inversion using source stacking: synthetic experiments at the global scale in a realistic 3-D earth model Open
SUMMARY The spectral element method is currently the method of choice for computing accurate synthetic seismic wavefields in realistic 3-D earth models at the global scale. However, it requires significantly more computational time, compar…
View article: Influence of the Asthenosphere on Earth Dynamics and Evolution
Influence of the Asthenosphere on Earth Dynamics and Evolution Open
The existence of a thin, weak asthenospheric layer beneath Earth’s lithospheric plates is consistent with existing geological and geophysical constraints, including Pleistocene glacio-isostatic adjustment, modeling of gravity anomali…
View article: Imaging deep-mantle plumbing beneath La Réunion and Comores hot spots: Vertical plume conduits and horizontal ponding zones
Imaging deep-mantle plumbing beneath La Réunion and Comores hot spots: Vertical plume conduits and horizontal ponding zones Open
Whether the two large low–shear velocity provinces (LLSVPs) at the base of Earth’s mantle are wide compact structures extending thousands of kilometers upward or bundles of distinct mantle plumes is the subject of debate. Full waveform she…
View article: Continental rifts and mantle convection: Insights from the East African Rift and a new model of the West European Rift System
Continental rifts and mantle convection: Insights from the East African Rift and a new model of the West European Rift System Open
<div> <div> <div> <div> <p>The origin of the Eocene-Oligocene European Cenozoic Rift System (ECRIS) is debated in terms of driving forces, far-field or near field, Alpine slab-pull or active plume. An analysis…
View article: Gender equity actions at the ERC: results of sustained measures&#160;
Gender equity actions at the ERC: results of sustained measures  Open
<p>The European Research Council (ERC), Europe&#8217;s premiere funding agency for frontier research, views equality of opportunities as an essential priority and a vital mission to ensure credibility in the review process. The E…
View article: Imaging the meso-scale structure of the upper mantle beneath the southern and central Atlantic ocean
Imaging the meso-scale structure of the upper mantle beneath the southern and central Atlantic ocean Open
<p>Although seismic tomography has provided important constraints on the long-wavelength structure of the mantle and its planform of convection, much is yet not well understood about the dynamic interaction of tectonic plates and dee…
View article: Plume conduits rooted at the core-mantle boundary beneath the R&#233;union hotspot
Plume conduits rooted at the core-mantle boundary beneath the Réunion hotspot Open
<p>Mid-plate volcanoes are well known as hotspots. They represent the surface signature of mantle plumes, nevertheless their origin and their role in geodynamics are still a challenge in the Earth sciences. Even though plate tectonic…
View article: An analysis of core–mantle boundary Stoneley mode sensitivity and sources of uncertainty
An analysis of core–mantle boundary Stoneley mode sensitivity and sources of uncertainty Open
SUMMARY Stoneley modes are a special subset of normal modes whose energy is confined along the core–mantle boundary (CMB). As such, they offer a unique glimpse into Earth structure at the base of the mantle. They are often observed through…
View article: Global reference seismological data sets: multimode surface wave dispersion
Global reference seismological data sets: multimode surface wave dispersion Open
SUMMARY Global variations in the propagation of fundamental-mode and overtone surface waves provide unique constraints on the low-frequency source properties and structure of the Earth’s upper mantle, transition zone and mid mantle. We con…
View article: Multi‐Mode Waveform Tomography of the Indian Ocean Upper and Mid‐Mantle Around the Réunion Hotspot
Multi‐Mode Waveform Tomography of the Indian Ocean Upper and Mid‐Mantle Around the Réunion Hotspot Open
Réunion Island in the western Indian Ocean is well known as one of the most active volcanic hotspots on Earth. Its birth, Ma ago, created the Deccan volcanic traps in India (almost 2 million ), associated with the Cretaceous‐Tertiary bound…
View article: Seismic anisotropy, dominant slip systems and phase transitions in the lowermost mantle
Seismic anisotropy, dominant slip systems and phase transitions in the lowermost mantle Open
SUMMARY The presence of seismic anisotropy at the base of the Earth's mantle is well established, but there is no consensus on the deformation mechanisms in lower mantle minerals that could explain it. Strong anisotropy in magnesium post-p…
View article: Constraining Jumps in Density and Elastic Properties at the 660 km Discontinuity Using Normal Mode Data via the Backus‐Gilbert Method
Constraining Jumps in Density and Elastic Properties at the 660 km Discontinuity Using Normal Mode Data via the Backus‐Gilbert Method Open
We apply the Backus‐Gilbert approach to normal mode center frequency data, to constrain jumps in P, S, bulk‐sound speed and density at the “660” discontinuity in the earth’s mantle (∼650–670 km depth). Different 1‐D models are considered t…