Geological Society of America Publications’ Post

#mathematics #algebra, #geometry and #topology" #OpenAccess Highly viewed paper "Transitive Deficiency One Parallelisms of PG(3, 7)" by Svetlana Topalova and Stela Zhelezova. Keywords: finite projective space; parallelism; automorphism; transitive #group; deficiency one https://lnkd.in/g46k2rN3

⚛️🚀 Awesome optics‼️ Awesome physics‼️ 🚨 Snell's Law explains light refraction at the interface of two media, relating angles of incidence and refraction to their refractive indices. It governs how the changes in wave direction are produced due to speed variations, which is crucial in optics for lenses, prisms, and fiber optics design. #science #engineering #geology #design #creativity #innovation #construction #art 🎥 Please DM for credit

💡 #Highcitedpaper #HarokopioUniversity #UniversityofIoannina #NationalObservatoryofAthens #NationalandKapodistrianUniversityofAthens 🌊 Title: Late Quaternary Marine Terraces and Tectonic Uplift Rates of the Broader Neapolis Area (SE Peloponnese, Greece) 🔑 Keywords: #geomorphology; #marineterraces; #sea-levelindicators; #tectonicuplift; #Quaternary; #ElafonissosIsland 🔗 Read More at: https://lnkd.in/gTb8QFq2 📜 Abstract: Marine terraces are geomorphic markers largely used to estimate past sea-level positions and surface deformation rates in studies focused on climate and tectonic processes worldwide. This paper aims to investigate the role of tectonic processes in the late Quaternary evolution of the coastal landscape of the broader Neapolis area by assessing long-term vertical deformation rates. To document and estimate coastal uplift, marine terraces are used in conjunction with Optically Stimulated Luminescence (OSL) dating and correlation to late Quaternary eustatic sea-level variations. The study area is located in SE Peloponnese in a tectonically active region. Geodynamic processes in the area are related to the active subduction of the African lithosphere beneath the Eurasian plate. A series of 10 well preserved uplifted marine terraces with inner edges ranging in elevation from 8 ± 2 m to 192 ± 2 m above m.s.l. have been documented, indicating a significant coastal uplift of the study area. Marine terraces have been identified and mapped using topographic maps (at a scale of 1:5000), aerial photographs, and a 2 m resolution Digital Elevation Model (DEM), supported by extensive field observations. OSL dating of selected samples from two of the terraces allowed us to correlate them with late Pleistocene Marine Isotope Stage (MIS) sea-level highstands and to estimate the long-term uplift rate. Based on the findings of the above approach, a long-term uplift rate of 0.36 ± 0.11 mm a−1 over the last 401 ± 10 ka has been suggested for the study area. The spatially uniform uplift of the broader Neapolis area is driven by the active subduction of the African lithosphere beneath the Eurasian plate since the study area is situated very close (~90 km) to the active margin of the Hellenic subduction zone.

#mathematics #algebra, #geometry and #opology Highly Viewed Article "Conics from the Cartan Decomposition of SO(2,1)", by Dr. Mircea Crasmareanu. Keywords: conic; Cartan decomposition of SO(2,1); #complex #variable https://lnkd.in/dGQ_vN6G

I'm thrilled to share that our latest paper is featured on the cover of the July edition of Astrobiology! 🚀 In our study, we used advanced synchrotron X-ray nanoimaging to reveal 2 million-year-old fossilized microorganisms in iron-rich and acidic deposits from Rio Tinto, Spain. These deposits are analogous to those found on Mars at Meridiani Planum, providing a unique opportunity to study ancient extremophile communities and their preservation in extreme environments. By employing a multi-scale coherent X-ray 3D imaging technique, we analyzed the morphology and preservation of fossil microbes from the nanoscale to the population scale, uncovering details about their ecology, metabolism, and interactions with minerals. Our work also introduces a novel approach to investigating microbial signatures in extreme environments, such as Precambrian rocks, and helps anticipate the challenges we may face in analyzing ancient traces of life in Martian samples returned in the near future. We are excited to contribute to the development of techniques that will be crucial for exploring early fossils both on Earth, and other distant worlds! 🔗 https://lnkd.in/d4dDCb3d #Astrobiology #FossilBiosignatures #RioTinto #MarsAnalogues #Microfossils #SynchrotronNanoImaging #Ptychography

🌏 #A_Journey_to_the_Other_Side_of_the_Earth: Calculating Antipodal Points** 🌏 Ever wondered where you'd end up if you dug a tunnel straight through the Earth from your current location? It's a fascinating hypothetical scenario that can be explored using spherical coordinates! Imagine starting at the coordinates 26.510748, 91.176175 (my current location). By applying some simple calculations, we can determine the exact point on the Earth's surface directly opposite our starting point, known as the antipodal point. Surprisingly, these coordinates place you somewhere in the South Atlantic Ocean, east of Argentina's coast! Here's how we calculate it: 1. #Latitude_Calculation: -The antipodal latitude is simply the negative of the original latitude. For 26.510748, the antipodal latitude is -26.510748. 2. #Longitude_Calculation: - The antipodal longitude is found by subtracting the original longitude from 180 degrees and then changing the sign. For 91.176175, the calculation is 180 − 91.176175 = 88.823825 180−91.176175=88.823825. Since the original longitude is east (positive), the antipodal longitude will be west (negative), resulting in -88.823825. So, the antipodal coordinates are approximately -26.510748, -88.823825. #CrazyThoughts #Geography #MathInAction #SphericalCoordinates #AntipodalPoints #Curiosity #Science

I'm excited to announce that our new research article titled "Structural Analysis and Evolution of Large Venusian Coronae: Insights from Low-Angle Faults at Coronae Rims" has been published in the Journal of Planetary and Space Science. This study provides a comprehensive analysis of the terrain and fracture patterns of the Atahensik Corona on Venus. We aim to gain new insights into the processes that shape and change these features by comparing our findings with those from other coronae on Venus. 😊🚀 Read the full article here: https://lnkd.in/ecZS3WAp. #Research #Venus #PlanetaryScience #UniFreiburg #UniversitätFreiburg

🌍 Empirical Corrections to Lunisolar Nutation and Their Impact on Celestial Pole Offset Predictions 🌍 Join us at the #AGU24 Annual Meeting in the IAG GGOS - Global Geodetic Observing System session G52A, "Geodetic #Standards for Improved Accurate and Consistent #EarthObservation Products from Global Geodetic Observing System Techniques", for an insightful presentation: 📣 Title: Empirical Corrections to the Main Lunisolar Nutation Terms and Their Impact on Celestial Pole Offset Predictions 🗣️ Presenter: Santiago Belda Palazón (University of Alicante) 📅 Date: Friday, 13 December ⏰ Time: 10:50 - 11:00 📍 Location: Marquis 1-2 (Marriott Marquis) ⭐ Highlight: How do differences in terrestrial and celestial reference frames impact #EarthOrientationParameters (EOP) and #CelestialPoleOffset (CPO) predictions? This talk explores: - Empirical corrections to precession offsets, rates, and amplitudes of The International Astronomical Union 2000A nutation terms. - Consistency and systematic errors among reference frames (e.g., DTRF2020, ITRF2020, VTRF2020). - Improved predictions for CPO, ranging from ultra-short to long-term, with evidence of high accuracy and stability. Don't miss this opportunity to deepen your understanding of reference frame consistency and advancements in CPO forecasting in #Geodesy, #VLBI, and #EarthOrientation! 🔗 Full session details: https://lnkd.in/daB4x4-S International Union of Geodesy and Geophysics

🔍 Exploring One-Way Reflection Waveform Inversion (ORWI) One-Way Reflection Waveform Inversion (ORWI) relies on a one-way acoustic wavefield extrapolation scheme. As an inverse problem, ORWI alternately solves a two-parameter minimization problem—background velocity and angle-independent reflectivity. This is achieved using a data error function that measures the reflection data (primaries) error in the least-squares sense. 📄 The model discussed here is taken from Mike Warner’s paper, presented at EAGE 2018. In this example, the challenge is to determine the velocity model represented by the missing dipping layers from the initial model. We applied ORWI to reconstruct these missing layers (video). 👨🏫 Key details of the inversion: • Maximum offset in the observed data: 1.5 km • Frequency content: 0-60 Hz • No multi-scaling strategy applied #ORWI #velocitymodelbuilding #VMB #phd #delphiconsortium #tudelft #seismology #FWI #RWI #research #energytransition #seismic #inversion #optimization #geophysics #SEG #EAGE #AAPG #tomography #imaging #greenenergy #modeling #data #acoustic #elastic #geology