Article
Geochemistry & Geophysics
J. N. Williams, M. J. Werner, K. Goda, L. N. J. Wedmore, R. De Risi, J. Biggs, H. Mdala, Z. Dulanya, A. Fagereng, F. Mphepo, P. Chindandali
Summary: Historical and instrumental earthquake catalogs may not accurately reflect the long-term distribution of seismicity in low strain rate regions. Therefore, probabilistic seismic hazard analysis (PSHA) should consider geologic and geodetic data to incorporate fault-based seismogenic sources. The study explores these issues in the context of a new PSHA for Malawi, which has a thick seismogenic layer and a growing exposure to seismic hazard. The results emphasize the importance of careful fault source modeling in PSHA and the need for new fault-based PSHA in the East Africa Rift.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Yangming Wu, Jie Liao, Jiarong Qing, Yongqiang Shen
Summary: The study investigates the development of subduction in the tectonic setting where mid-ocean ridges and passive continental margins are juxtaposed using a 2-D numerical model. The results reveal three types of oceanic plate subduction: continental margin subduction, ridge-inversed subduction, and a transitional type with double subduction along ridges and margins. The physical parameters that influence the formation of these subduction types are systematically analyzed. The study emphasizes the significance of preexisting weakness along passive margins in promoting subduction development.
Article
Geochemistry & Geophysics
E. Crowder, N. Rawlinson, D. G. Cornwell, C. Sammarco, E. Galetti, A. Curtis
Summary: The deep crustal structure beneath the North Sea is poorly understood but the mid to lower crust plays important roles in rift initiation and evolution. Ancient tectonic features exist beneath the North Sea, making it an ideal location to investigate regional heterogeneity and rifting interactions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
C. Peirce, M. J. Funnell, T. J. Reston, C. J. MacLeod
Summary: This study models the structure of multiple OCCs on the Mid-Atlantic Ridge using seismic tomography. The results suggest that the formation of OCCs may be influenced by the presence of magma and the characteristics of the crust. The study also investigates the drivers of hydrothermal circulation in different vent fields, revealing varying mechanisms in different regions.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geosciences, Multidisciplinary
Yangming Wu, Jie Liao, Feng Guo, Xuan-Ce Wang, Yongqiang Shen
Summary: Through geodynamic modeling, this study reveals that trench-parallel mid-ocean ridge subduction can result in diverse geological evolution, with two distinct types of model evolution and different tectono-magmatic responses. This research helps explain the magmatic evolution and tectonic uplift in the circum-Pacific continental margins.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Trond Ryberg, Christian Haberland, Britta Wawerzinek, Manfred Stiller, Klaus Bauer, Alberto Zanetti, Luca Ziberna, Gyoergy Hetenyi, Othmar Muntener, Michael M. Weber, Charlotte M. Krawczyk
Summary: We present new findings from a seismic experiment conducted in the deepest part of the Val Sesia crust-mantle section in the Ivrea-Verbano zone in the Italian Alps. The experiment revealed a tilted, complete section of the continental crust containing gabbros and peridotites. By using inversion methods, a 3D P-wave velocity model was created, showing a sharp velocity change across the Insubric Zone. The prominent feature of the model is a high-velocity body interpreted as peridotite, which challenges previous models and suggests a reevaluation of the dimension of peridotite material in the area.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2023)
Article
Geochemistry & Geophysics
Catherine A. Rychert, Saikiran Tharimena, Nicholas Harmon, Shunguo Wang, Steven Constable, J. Michael Kendall, Petros Bogiatzis, Matthew R. Agius, David Schlaphorst
Summary: The study reveals evidence of persistent melt in the equatorial Mid-Atlantic Ridge region using ocean bottom seismometer data, which has important implications for plate tectonic theory.
EARTH AND PLANETARY SCIENCE LETTERS
(2021)
Article
Multidisciplinary Sciences
Ingo Grevemeyer, Lars H. Ruepke, Jason P. Morgan, Karthik Iyer, Colin W. Devey
Summary: Oceanic transform faults, which were previously believed to be conservative two-dimensional strike-slip boundaries, are revealed to be more complex due to deeper seafloor along the faults than their associated fracture zones. Accretion at intersections between oceanic ridges and transform faults is asymmetric, with outside corners showing shallower relief and more extensive magmatism. This leads to a two-stage process of accretion at transform-fault systems, different from other regions along mid-ocean ridges.
Article
Multidisciplinary Sciences
Gang Lu, Ritske S. Huismans
Summary: This study investigates the formation mechanism of volcanic activity at rifted margins using numerical models, revealing a surprising correlation between magmatism and margin width, which differs from previous theories.
NATURE COMMUNICATIONS
(2021)
Article
Geosciences, Multidisciplinary
H. T. Linang, S. Pilia, N. Rawlinson, C. A. Bacon, A. Gilligan, D. G. Cornwell, F. Tongkul
Summary: The study revealed a thick crustal root beneath the Crocker Range and a relatively thin crust in the southeast of northern Borneo, extending into the Sulu Sea, with back-arc rifting behind the younger subduction zone. The findings are consistent with numerical models of subduction polarity reversal involving arc-continent collision, but with differences such as significant mountain ranges and limited back-arc rifting due to northern Borneo being an example of continent-continent collision involved in subduction polarity reversal.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Editorial Material
Geosciences, Multidisciplinary
Tiago M. Alves, Julie Tugend, Simon Holford, Claudia Bertoni, Wei Li
Summary: The geological processes responsible for the formation of continental margins are complex and vary between different margins and adjacent sedimentary basins. Understanding these processes is crucial for determining the economic potential of continental margins.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Geochemistry & Geophysics
C. Peirce, I Grevemeyer, N. W. Hayman, H. J. A. Van Avendonk
Summary: The Swan Islands transform fault marks the southern boundary of the Cayman Trough in the Caribbean and represents the ocean-continent transition of the Honduras continental margin. The CAYSEIS experiment reveals the crustal structure of an actively evolving transform continental margin and the nature of the crust and uppermost mantle beneath the ridge-transform intersection (RTI).
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geochemistry & Geophysics
Taco Broerse, Nemanja Krstekanic, Cor Kasbergen, Ernst Willingshofer
Summary: The article discusses the application of Particle Image Velocimetry (PIV) in simulating geological deformation processes, focusing on the development of strain tensors and qualitative description of large shape changes. Combining Hencky strains is found to provide a meaningful classification of large 2-D strains, accurately mapping deformation in analogue models of lithospheric deformation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geosciences, Multidisciplinary
Adria Ramos, Antonio Pedrera, Jesus Garcia-Senz, Berta Lopez-Mir, Ramon Salas
Summary: This study uses seismic-reflection survey to analyze the structure of the Columbrets Basin, revealing the tectonic fabric underlying the sedimentary basin, including the top structure of the lower crust and the Moho. The study suggests that ductile deformation of the mid-lower crust was the main mechanism controlling the basin geometry, coinciding with the reactivation of two large-offset SW-dipping normal faults. Mid-lower crustal necking occurred below major depocenters before hyperextension. These results provide new insights into the formation of circular-shaped basins and depth-dependent extensional processes during rifting.
Article
Geochemistry & Geophysics
Jiaxuan Tang, Lin Chen, Lijun Liu, Zhiyong Yan, Wei Lin, Qingren Meng
Summary: The results of 2D thermomechanical simulations show that the pre-existing weaknesses in the North China Craton played a crucial role in the formation of quasi-simultaneous MCCs series in response to the retreat of the Palaeo-Pacific Plate. Stronger upper crust and weaker lower crust are favorable conditions for MCC formation, and the strength of the lithosphere may affect the timing of MCC formation.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geology
Nathalie Babonneau, Francois Raisson, Adrien Genet, Ugo Lopes, Ruth Fierens, Elda Miramontes, Sidonie Revillon, Marina Rabineau, Laurence Droz, Deborah Belleney, Maryline Moulin, Daniel Aslanian
Summary: This paper focuses on the study of a contouritic ridge on the Mozambique margin, revealing the importance of bottom currents in shaping submarine slopes and their interaction with other processes. The presence of an intermediate position for contouritic facies in the sedimentary system is also identified.
Article
Marine & Freshwater Biology
Matthieu Guillaume Olivier, Estelle Leroux, Didier Granjeon, Pierre Le Hir, Marina Rabineau, Pascal Le Roy, Laure Simplet, Axel Ehrhold, Heloise Muller
Summary: This study uses numerical modeling to explore the long-term evolution of sediment dynamics induced by tides in tide-dominated estuaries, providing a method and data support for simulating and understanding estuarine sedimentation processes.
ESTUARINE COASTAL AND SHELF SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Afonso Loureiro, Alexandra Afilhado, Philippe Schnurle, Mikael Evain, Nuno A. Dias, Frauke Klingelhofer, Flora Gallais, Joao Marcelo Pinheiro, Jose Eduardo Soares, Reinhardt Fuck, J. A. Cupertino, Adriano Viana, Carlos Corela, Maryline Moulin, Daniel Aslanian
Summary: During the SALSA experiment in 2014, wide-angle refraction and seismic profiles were acquired in the Jequitinhonha-Almada-Camamu, Jacuipe, and Sergipe-Alagoas basins in NE Brazil. The study found that sediment thickness varies across the profile, with the Camamu basin showing a distinct crustal layer structure. The results suggest that the Almada and Camamu basins contain exhumed continental crust.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Geosciences, Multidisciplinary
U. Lopes, N. Babonneau, R. Fierens, S. Revillon, F. Raisson, E. Miramontes, M. Rabineau, D. Aslanian, M. Moulin
Summary: This study investigates a fringing coral reef located near Athens, Greece, and highlights its unique sedimentary characteristics. The findings suggest that the reef can serve as an important paleoceanographic and paleoclimatic archive.
Article
Geochemistry & Geophysics
M. Moulin, A. Lepretre, F. Verrier, P. Schnurle, M. Evain, P. de Clarens, J. Thompson, N. Dias, A. Afilhado, A. Loureiro, D. Aslanian
Summary: The North Natal valley is an important region for understanding the history of the South-West Indian Ocean since the Gondwana break-up. The crustal nature and geometry of the valley have significant implications for the reconstruction of paleogeography. The recent data set from the PAMELA project provides new constraints for kinematic re-constructions and reveals the presence of sedimentary and volcanic structures, as well as variations in crustal thickness and velocity.
Review
Geosciences, Multidisciplinary
Daniel Aslanian, Romain Pellen, Marina Rabineau, Maryline Moulin, Estelle Leroux, Antoine Delaunay, Guillaume Baby, Simon Courgeon, Bastien Linol, Jean-Pierre Suc, Speranta Popescu, Severine Fauquette, Paul P. A. Mazza, Sebastien Couette, Massimiliano Delpero, Thierry Huck, Pierrick Penven, Theo Le Hir, Yurui Zhang, Fabien Genin, Judith Masters
Summary: The vertebrate fauna of Madagascar has a unique biogeographic history that differs from colonization models of other islands. While the popular belief has been that most terrestrial vertebrate fauna arrived from Africa through transoceanic dispersal, a new hypothesis of recurrent land bridge uplifts has been challenged. A comprehensive study utilizing sedimentary, tectonic, kinematic, and palaeo-environmental analyses presents a more holistic explanation based on a large-scale dataset. Preliminary palynological results provide insight into the vegetation belts of Madagascar from the coast to high relief.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
Mikael Evain, Philippe Schnuerle, Afonso Loureiro, Flora Gallais, Joao Pinheiro, Alexandra Afilhado, Frauke Klingelhoefer, Nuno Dias, Reinhardt Fuck, J. A. Cupertino, Adriano Viana, Daniel Aslanian, Maryline Moulin
Summary: This study examines the along-strike segmentation of the passive margin in Northeast Brazil by analyzing marine seismic reflection and refraction data. The results show that plate kinematics and lithospheric inheritance play a crucial role in shaping the segmentation of the passive margins in this region.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2023)
Article
Astronomy & Astrophysics
P. Schnurle, A. Lepretre, M. Evain, F. Verrier, P. De-Clarens, Joseph Thompson, N. Dias, A. Afilhado, A. Loureiro, S. Leroy, E. d'Acremont, D. Aslanian, M. Moulin
Summary: This study analyzes the crustal structure of the South Mozambique passive margin using seismic profiles. The results reveal the presence of sedimentary cover, magmatic or volcano-clastic deposits, and variations in crustal thickness.
EARTH AND SPACE SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
Haekal A. Haridhi, Bor Shouh Huang, Kuo Liang Wen, Arif Mirza, Syamsul Rizal, Syahrul Purnawan, Ilham Fajri, Frauke Klingelhoefer, Char Shine Liu, Chao Shing Lee, Crispen R. Wilson, Tso-Ren Wu, Ichsan Setiawan, Van Bang Phung
Summary: Near the northern border of Sumatra, the Sumatran fault zone splits into two branches and extends into the offshore. Large submarine landslides have been triggered by the extended fault zone, as indicated by seismic profiles. Based on simulation, the strike-slip fault system can generate a potential tsunami hazard along the northern coast of Aceh.
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
(2023)
