Andreas Fichtner’s Post

AGU 2024 - Advances in Theoretical and Computational Seismology The American Geophysical Union (AGU) Fall Meeting will take place from 9 - 13 December in Washington D.C. We (Monica Maceira, Carene Larmat, Marine Denolle and myself) will again organise our traditional session on theoretical and computational seismology, with Jannes Münchmeyer and Barbara Romanowicz as invited speakers. In this session, we welcome innovative contributions dealing with creative approaches to more accurate and faster forward modeling, efficient solutions of (nonlinear) inverse problems, and methods that enable the exploitation of massive emerging data volumes. Of particular interest are contributions on the modeling and inversion of data from fiber-optic seismology, multi-scale or multi-parameter tomography, effective medium theory, uncertainty analysis in both data and model space, machine learning approaches to data mining and inversion, novel concepts in seismic interferometry, as well as the use of emerging hardware solutions or new programming languages. The abstract submission deadline is 31 July. For more information, please see the official session website: https://lnkd.in/dB-R8uT8 #seismology #geophysics #computing #waves #fiberoptics #inversetheory #tomography #machinelearning #interferometry #highperformancecomputing #numericalmethods #data

Welcome to read my recent article published in Earth Science Reviews. This comprehensive article summarises different topics about satellite gravimetry data and products such as static and time-variable gravity models as well as applications like Geoid modelling, height systems, crustal structure modelling, lithospheric stress, Earthquakes' epicentre, Earth's tensor of Inertia and dipole, percession and nutation, hydrological modelling, ocean bathymetry, elastic thickness modelling, glaciology and sea level. This article is written in collaborations with different geodesists from a diverse geographical locations and it is a good reference and guide for physical geodesists specially PhD students and young researchers. I hope you will enjoy reading it. https://lnkd.in/dbEEuKw4 #geodesy #geophysics #Earth #gravimetry

#Seismology in the #lab? Wen Zhou started in May as #EPOS_eNLarge researcher at the Faculty of Geosciences (Utrecht University), developing #acoustic measurement techniques for the High Pressure and Temperature and Tectonic Modelling laboratories, together with a.o. André Niemeijer and Ernst Willingshofer. He uses state-of-the-art equipment like laser vibration measurement systems and conventional piezo sensor arrays to push the boundaries of #ultrasound detection in various experiments. This will involve capturing minuscule ultrasonic waves from laboratory ‘#earthquakes’ and creating detailed images of the samples under study. #Geoscience #Geosciences #earthscience #earthsciences #openscience #Geologie #Onderzoek #innovatie #geophysics #geophysical #researchinfrastructure #earthquake #ultrasonic Ivan Vasconcelos

What drives large-scale extensional strain in southern Tibet? In our latest collaborative study, we tackle this key question by combining Sentinel-1 InSAR and GNSS data to produce high-resolution maps of 3D velocities and strain rates across Southern Tibet. We focused on seven major rift zones, uncovering the details of how the region is extending at a total rate of 18.4 mm/yr. This work wouldn’t have been possible without the fantastic collaboration between researchers from the China Earthquake Administration, Nanjing University, and the Computational Geophysics Lab at Nanyang Technological University Singapore, Earth Observatory of Singapore, and NTU Asian School of the Environment. Check out our paper published in Geophysical Research Letters: https://lnkd.in/gxXkbJdw

Discover this insightful article by EQS team member Robert L. Nowack on "Science and Reflections: With Some Thoughts for Young Applied Scientists and Engineers". 🔷 Author: Robert L. Nowack 🔷 Keywords: geophysics, computational and data science, applied science and engineering 🔷 Key points: • Reflections and science are presented from experiences working in geophysics. • Several connections are described between the applied sciences and the computational and data sciences. • Insights are provided that might be useful to young applied scientists and engineers. Click here for the article: https://lnkd.in/eCTwv3qQ Click here to submit a paper: https://lnkd.in/e4DydcAM We hope this information will be helpful for your research. #EQS #Earthquake #Science #Geophysics #DataScience #AppliedScience #Engineering

📢CALL FOR PAPERS📢 Seismological Research Letters #SRL is soliciting manuscripts for a Focus Section on 🌊Advances in Ocean Monitoring 🌊 Deadline for Submission: 9 Sept. 2024 Significant advances have been realized in physical observation and modeling in the marine environment, driven both by the importance of extending Earth observation networks into the >70% of the solid Earth that lies beneath the seas, and by the critical need to improve our observational and modeling capacity for the oceans themselves. Our understanding of the fundamental plate tectonics and Earth structure continues to improve with expanded marine deployments, and improvements in data quality. Earthquake and tsunami early warning can be greatly improved by the presence of reliable real-time data from the seafloor. Climate change is driving rapid evolution of wave propagation and noise environments in polar regions, which can directly affect both our observational thresholds and our ability to locate events using hydroacoustic signals. The very real consequences of sea-level rise due to climate change, such as greater storm and tsunami inundations, may be better predicted with ubiquitous seafloor pressure and temperature sensing, and impacts to ecosystems can likewise be evaluated using these methods. New sensing technologies are evolving at a rapid pace, and new analyses based upon seafloor or subsurface water column sensing are driving this frontier of seismoacoustic and geophysical research. Work in this challenging marine environment is blurring the lines between geophysics, cryoseismology, and physical oceanography, while also cultivating much needed international collaborations. We welcome contributions relevant to this multidisciplinary arena, from observational, modeling, and prediction perspectives, as well as novel technologies, sensor development and societal applications. Guest editors include: Kasey Aderhold, EarthScope Consortium Helen Janiszewski, University of Hawaii at Manoa Diana Núñez, Universidad Complutense de Madrid (UCM) Tiago Oliveira, Comprehensive Nuclear-Test-Ban Treaty Organization - CTBTO Charlotte Rowe, Los Alamos National Laboratory https://lnkd.in/gESpYZfm

📄 Open access paper : “Catalogue of Source Mechanisms and Overview of Present-Day Stress Fields in the Western Region of the Africa–Eurasia Plate Boundary” by Farida Ousadou, abdelhakim Ayadi from the Center of Research in Astronomy, Astrophysics, and Geophysics (#CRAAG) and Mourad Bezzeghoud from the University of Évora. 🌍📖💡 The study delves into the complex deformation along the plate boundary between Africa and Eurasia, providing an updated scheme of the tectonic stress direction from the Azores Archipelago to the Tunisian Atlas. It further proposes a new sketch of the present stress field along the western part of the Eurasia–Africa plate boundary. This comprehensive research serves as a valuable resource for those interested in geodynamics, stress fields, and seismicity. 🔍 Key Insights: 1. The faulting mechanism changes from normal faulting at the Mid-Atlantic Ridge to thrust and strike-slip faulting in the Ibero-Maghreb region. 2. The study area shows the occurrence of NW‒SE convergence between the two plates, with anticlockwise rotation. 3. The inversion considers only the earthquake mechanisms of events 4.0≤M≤8.4, excluding the aftershocks of strong events. 4. The obtained stress field shows an extensional regime in the Mid-Atlantic Ridge, Terceira Ridge and Azores Islands and a strike-slip regime along the Gloria Fault, Gorringe Bank, and Gulf of Cadiz, to southern Spain. The stress regime becomes compressional in western Algeria, with strike-slip in eastern and southern Tunisia and an exception in northern Tunisia, where the stress exhibits a reverse rupture process. 🔗 Paper Link: https://lnkd.in/ddmk_bTE #StressFields #Africa #Eurasia #PlateBoundary #FaultPlaneSolutions #Seismicity #Geodynamics #FaultingMechanism #MidAtlanticRidge #Ibero #MaghrebRegion #Faulting #ThrustFaulting #ExtensionalRegime #CompressionalRegime #Geomechanics #Earthquake #Geotechnical #Engineering #Algeria #Craag #Portugal #Spain

🚀 **Innovative Prediction in Geophysics: Unveiling the Secrets of the Thermosphere Winds** Exciting news in the field of geophysics! Researchers have made a groundbreaking discovery in a recent publication in Geophysical Research Letters, shedding light on the turbulence in the thermosphere. • Our understanding of the thermosphere winds is expanding, revealing intriguing parallels to the lower atmosphere's wind patterns. • The revelation that the turbulence in the thermosphere adheres to similar physical laws as lower atmospheric wind showcases the interconnectedness of Earth's atmospheric dynamics. • Moreover, the predominant cyclonic rotation of wind in the thermosphere highlights the complexity and beauty of Earth's atmospheric systems. • With this new insight, we can potentially enhance our predictive capabilities for space weather phenomena that impact satellite communications, GPS systems, and other critical technologies. • This discovery opens up exciting possibilities for further exploration and research into the intricacies of Earth's atmosphere and its impacts on our daily lives. Let's stay tuned for further developments in this fascinating area of geophysics! 🛰️📡 #Geophysics #Thermosphere #Winds #ResearchDiscovery #EarthAtmosphere

1) near source and a special method: LPDT  2) MSM: microseismic sounding method about ambient noise 3) physics-based method and PSHA  4) Induced Earthquakes and ground motion predictions  5) Swarm intelligence optimization  6) site effect: SPAC Studying geophysics has always been interesting and exciting for me. During the previous fall, I did research on the various methods that I have written about below. In the future, I want to collaborate with other professors in these fields. I would like to thank the authors of these articles and wish them success in their exciting journey in geophysics. In short, I have explained each method in these slides and I hope you can learn from even one small point of each method. with respect Mohammad Reza Hosseini #geophysics #SPAC #siteeffect #MSM #PSHA #nearsource #earthquake #hazard #risk #AI #swarm #inversion #physicsbase #noise #PHD #autocorrelation

How does a seabed telecom's cable respond to seismic waves? David Fairweather, Giuseppe Marra and others reach surprising conclusions in a controlled test, comparing integrated (optical interferometry) and distributed acoustic sensing (DAS) fibre measurements with recordings from 58 geophones, 20 three-axis seismometers and 7 microphones. The results demonstrate sensitivity of integrated optical phase measurements to broadside arriving waves, in contrast to predictions from prevailing theory. A fast-wave arrival, attributed to energy propagating through the metal armour of the submarine cables, greatly affects the optical signals. And sensing on separate optical fibres within the same telecom's cable can lead to significantly different waveforms. For more information: https://lnkd.in/e6_thRtK #UniversityOfEdinburgh #EdinburghUniversity #royalastrosoc #GeologicalSociety #GeolSocLondon #Geoscience #EarthScience #Geophysics #Physics #waveforminversion #inversion #imaging #seismics #seismology #telecommunications #opticalfibre #acoustic