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Showing 33701 to 33750 of 59105 works
The influence of local low-density basement anomalies on the distribution of fluvio-deltaic sediment in rift basins: th…
Local low-density basement anomalies are an important part of a rift basin’s inherited structural framework that can influence basin stratigraphy. Large granitic intrusions can ca…
Enriching the historical meteorological information using Romanian newspaper reports
This study presents the meteorological information spanning the last two decades of the end of 19th century (1880-1900) extracted from three Romanian newspapers (România Liberă, G…
Neue Lothaken (Firstennägel)
research
Weak phases production and heat generation controls fault friction during seismic slip
The triggering and magnitude of earthquakes is determined by the friction evolution along faults. Experimental results have revealed a drastic decrease of the friction coefficient…
Miniature paleo-speleothems from the earliest Ediacaran (635 Ma) Doushantuo cap dolostone in South China and their impl…
Speleothems can offer insights into terrestrial life because their formation is critically dependent on soil-microbial ecosystems. Here we report the wide distribution of miniatur…
Infilling abandoned deltaic channels through tidal sedimentation: a case study from the Huanghe (Yellow River) delta, C…
Upon avulsion, abandoned deltaic distributary channels receives water and sediment delivered by a tie channel, overbank flow, and by tidal inundation from the receiving basin. The…
Coseismic or Landslide? The source of the 2018 Palu Tsunami
On 28 September, 2018, Indonesia was struck by a MW 7.5 strike-slip earthquake. An unexpected tsunami followed, inundating nearby coastlines leading to extensive damage. Given the…
Organisatorische und technologische Neuerungen im Markt für Stromspeicher : Abschlussbericht des Projekts ZA 591 4-1 im…
Der Bericht fasst die wesentlichen Erkenntnisse und Outputs des DFG-Projekts ZA 591 4-1 und ihren Beitrag zu aktuell wichtigen Debatten der Wirtschaftsgeographie und der (geograph…
A report on gender diversity and equality at Tectonic Studies Group (TSG) meetings: 2007-2019.
The Tectonic Studies Group (TSG) is a specialist group of the Geological Society of London that was founded in 1970 as a forum for discussion of research in structural geology and…
Modeling deltaic lobe-building cycles and channel avulsions for the Yellow River delta, China
River deltas grow by repeating cycles of lobe development punctuated by channel avulsions, so that over time, lobes amalgamate to produce a composite landform. Existing models hav…
The effect of remote sensing resolution limits on aeolian sandstone measurements and the reconstruction of ancient dune…
The distribution of cross-set thicknesses is important field-collected data for reconstructing ancient aeolian dune fields from the strata they accumulated, but most aeolian strat…
Bayesian elastic Full-Waveform Inversion using Hamiltonian Monte Carlo
We present a proof of concept for Bayesian elastic full-waveform inversion in 2-D. This is based on (1) Hamiltonian Monte Carlo sampling of the posterior distribution, (2) the com…
An Adaptive Discontinuous Galerkin Method for the Simulation of Hurricane Storm Surge
Numerical simulations based on solving the 2D shallow water equations using a Discontinuous Galerkin (DG) discretisation have evolved to be a viable tool for many geophysical appl…
Paradoxical impact of sprawling intra-Urban Heat Islets: Reducing mean surface temperatures while enhancing local extre…
Cities are at the forefront of climate change impacts and face a growing burden of adaptation to ensuing natural hazards. Extreme heat is a particularly challenging hazard as pers…
Recommended "Best Practices" for Chirp Acquisition and Processing
This BOEM report describes details our experience/lessons learned in chirp subbottom data collection and processing.
Update zur Paragenese der hydrothermalen Rejuvenation im Rheinischen Schiefergebirge
Die sogenannte hydrothermale Rejuvenation ist eine spätvariszische, eigenständige Hydrothermalaktivität, die im Rheinischen Schiefergebirge vom Kerngebiet des Siegerländer Bergbau…
Investigating global correlations between tsunami, earthquake, and subduction zone characteristics
Tsunamigenic earthquakes pose a large hazard in subduction zones, but it is currently unclear in which - if any - tectonic setting they preferentially occur. Here, we compile the …
Methods and Test Cases for Linking Physics-Based Earthquake and Tsunami Models
Despite the inter-dependence of long term deformation, earthquakes and tsunamis, few modelling approaches bridge these processes. To advance the understanding of tsunami generatio…
The 1987 to 2019 Tennant Creek, Australia, earthquake sequence: a protracted intraplate multi-mainshock sequence
The 1987 to 2019 Tennant Creek earthquake sequence comprises three 1988 surface-rupturing mainshocks (moment magnitude (Mw 6.2, 6.3, and 6.5) that occurred within a 12-hour period…
Grainstone cross-set geometry as a physical proxy for chemical and biological sediment cohesion
Preserved cross-set thicknesses are powerful tools for unravelling past environmental conditions. The relative rate of bedform aggradation to migration (climb angle) is encoded in…
Coupled climate and subarctic Pacific nutrient upwelling over the last 850,000 years
High latitude deep water upwelling has the potential to control global climate over glacial timescales through the biological pump and ocean-atmosphere CO2 exchange. However, ther…
An equation of state for high pressure-temperature liquids (RTpress) with application to MgSiO3 melt
The thermophysical properties of molten silicates at extreme conditions are crucial for understanding the early evolution of Earth and other massive rocky planets, which is marked…
Bergordnung König Maximilian I. für Schwaz 1490
Diese Bergordnung wurde am 19. März 1490 für die Bergwerke in Schwaz von König Maximilian I. erlassen. Der expandierende Bergbau und die damit einhergehende Misswirtschaft und der…
Lower mantle structure from paleogeographically constrained dynamic Earth models
Seismic tomography reveals two large, low-shear velocity provinces (LLSVPs) beneath Africa and the Pacific Ocean. These structures may have existed for several 100 Myr and are lik…
Assimilating lithosphere and slab history in 4-D Earth models
We develop methods to incorporate paleogeographical constraints into numerical models of mantle convection. Through the solution of the convection equations, the models honor geop…
Dynamic origins of seismic wavespeed variation in D
The D discontinuity is defined by a seismic velocity increase of 1–3% about 250 km above the core–mantle boundary (CMB), and is mainly detected beneath locations of inferred paleo…
A geodynamic and mineral physics model of a solid-state ultralow-velocity zone
Recent results (Wicks et al., 2010) suggest that a mixture of iron-enriched (Mg,Fe)O and ambient mantle is consistent with wavespeed reductions and density increases inferred for …
Melt inclusion constraints on mantle carbon heterogeneity within an individual mantle plume and at the global scale
The Earth’s mantle holds more carbon than its oceans, atmosphere and continents combined, yet the distribution of carbon within the mantle remains uncertain. Global variations in …
Enhanced Convection and Fast Plumes in the Lower Mantle Induced by the Spin Transition in Ferropericlase
Using a numerical model we explore the consequences of the intrinsic density change (Δρ/ρ ≈ 2–4%) caused by the Fe2+ spin transition in ferropericlase on the style and vigor of ma…
Re-evaluating 14C dating accuracy in deep-sea sediment archives.
The current geochronological state of the art for applying the radiocarbon (14C) method to deep-sea sediment archives lacks key information on sediment bioturbation. Here, we appl…
Hydropower dependency and climate change in sub-Saharan Africa: A nexus framework and evidence-based review
In sub-Saharan Africa, 160 million grid-connected electricity consumers live in countries where hydropower accounts for over 50% of total power supply. A warmer climate with more …
On seismicity and structural style of oceanic transform faults: a field geological perspective from the Troodos ophioli…
Aseismic creep accommodates the majority of displacement along active oceanic transform faults, also within their thermally defined seismogenic zone. The significant earthquakes t…
Building back bigger in hurricane strike zones
Despite decades of regulatory efforts in the United States to decrease vulnerability in developed coastal zones, exposure of residential assets to hurricane damage is increasing —…
The near-tip region of a hydraulic fracture with pressure-dependent leak-off and leak-in
This paper is concerned with an analysis of the near tip region of a propagating fluid-driven fracture in a saturated permeable rock. The study attempts to accurately resolve the …
Frictional heterogeneities can promote disordered slip evolution on faults
We consider that a slip instability nucleates an earthquake. Past studies found blow-up solutions for diverging slip velocities. Prior stability analyses, considering heterogeneo…
Emergent self-similarity and scaling properties of fractal intra-Urban Heat Islets for diverse global cities
Urban areas experience elevated temperatures due to the Urban Heat Island (UHI) effect. However, temperatures within cities vary considerably and their spatial heterogeneity is no…
Comparing Aggradation, Superelevation, and Avulsion Frequency of Submarine and Fluvial Channels
IN REVIEW IN "FRONTIERS IN EARTH SCIENCE" (30 Aug 2019). Constraining the avulsion dynamics of rivers and submarine channels is essential for predicting the distribution and archi…
Controls on variations in minibasin geometries: Lower Congo Basin, offshore Angola
In passive margin salt basins, the distinct tectonic domains of thin-skinned extension and contraction exert important controls on the geometry and evolution of minibasins. In thi…
Subduction history reveals Cretaceous slab superflux as a possible cause for the mid-Cretaceous plume pulse and supersw…
Subduction is a fundamental mechanism of material exchange between the planetary interior and the surface. Despite its significance, our current understanding of fluctuating subdu…
Der Lotapparat für Bohrlöcher
research
Anatomy of exhumed river-channel belts: Bedform- to belt-scale kinematics of the Ruby Ranch Member, Cretaceous Cedar Mo…
Many published interpretations of ancient fluvial systems have relied on observations of extensive outcrops of thick successions. This paper, in contrast, demonstrates that a regi…
Accounting for training data error in machine learning applied to Earth observations
Remote sensing, or Earth Observation (EO), is increasingly used to understand Earth system dynamics and create continuous and categorical maps of biophysical properties and land c…
Speeding up PPP ambiguity resolution using triple-frequency GPS/BeiDou/Galileo/QZSS data
Precise point positioning (PPP) has been suffering from slow convergences to ambiguity-fixed solutions. It is expected that this situation can be relieved or even resolved using t…
Observed and modelled tidal bar sedimentology reveals preservation bias against mud in estuarine stratigraphy
Mud plays a pivotal role in estuarine ecology and morphology. However, field data on the lateral and vertical depositional record of mud is rare. Furthermore, numerical morphodyna…
Considering the role of adaptive evolution in models of the ocean and climate system
Numerical models have been highly successful in simulating global carbon and nutrient cycles in today’s ocean, together with observed spatial and temporal patterns of chlorophyll …
Bluecap: A Geospatial Model to Assess Regional Economic-Viability for Mineral Resource Development
Frontier mineral exploration is often exclusively focused on assessing geological potential without consideration for the economic viability of resource development. This strategy…
Die Faziesentwicklung der Zaluch-Gruppe (Perm) in der Salt Range und in den Trans Indus Ranges, Pakistan
Während des Perm war dem Indischen Schild ein vom Tethysmeer überfluteter Schelf vorgelagert. Die Sedimentation wurde von Meeresspiegelschwankungen und verschiedenen Hebungsphasen…
Solar signals in observation indeed implied enhanced predictability since 1977
This is a Correspondence submitted to Nature GeoScience following the undermentioned paper: Gabriel Chiodo, Jessica Oehrlein, Lorenzo M. Polvani, John C. Fyfe & Anne K. Smith,…
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