Mondaic Ltd.

📢 Paper alert – Salvus User 📢 Numerical Modeling Predicts Seismic Resonances in the Magma Chamber-Conduit System due to Wavefield Capturing  https://lnkd.in/dz9WaX28     Analysis of the seismic signals observed in the vicinity of volcanoes can provide information about the internal structure of the volcano itself and help us to gain a better understanding of the magmatic processes taking place that we are unable to see from the surface.    However, understanding the seismic signals can be a challenging task, given the wide range of signal characteristics seen and their possible causes. For example, one may be dealing with a combination of volcano-tectonic events, tremors and resonances.    This study uses #Salvus to simulate wave propagation from a double-couple source through a range of models of a magma chamber and conduit, both with varying diameters. Significant resonances are observed, particularly in systems with larger magma chambers and wider conduits. Such signals may appear similar to tremor when observed using seismometers at the surface.    Figure: Visualisation of the z-component of the wavefield at various time steps throughout the simulation:  (A) Shortly after excitation of the wavefield at a source  (B) Capturing of the incident wavefield within the magma chamber  (C) Reflection of the wavefield at internal boundaries within the magma chamber-conduit system  (D) Reverberations within the magma chamber and conduit induce ‘calabash resonances’    Image source: Figure 2 from the paper; published under CC BY 4.0 https://lnkd.in/e365Whs    Disclaimer: This work was carried out by researchers from Goethe University Frankfurt, FIAS - Frankfurt Institute for Advanced Studies, and the Institute for Geothermal Resource Management. Mondaic was not directly involved in this research, but we are proud to see Salvus being used in such an exciting project. 

Tools for Simulating Seismic Hazard in Switzerland https://lnkd.in/dtvxEWqm    Earthquake simulation can be a valuable tool to try to understand the seismic hazard in an area, including in regions with little historical data due to low rates of seismicity.    #Salvus provides a wide range of tools to accurately simulate earthquake ground motion, including the ability to incorporate topography, complex velocity models, anisotropy/attenuation, realistic boundary conditions and complex planar fault sources. The massively parallel implementation of Salvus (on both CPUs and GPUs) also facilitates rapid simulations.    Users can output an assortment of useful metrics for earthquake intensity, including peak ground velocity (PGV), peak ground acceleration (PGA), significant duration, macroseismic intensity and more.    Here, we show an example of the simulation of the historic 1365 Basel earthquake, estimated to have had a magnitude between 6.0 and 7.1. We utilise a realistic velocity model of Basel, including topography, to simulate the macroseismic intensity across the whole of Switzerland.    See the full case study on our website for further details of this work carried out with DT-GEO and Swiss Seismological Service (SED) at ETH Zurich.   #hazard #risk #earthquake #digitaltwin 

We are delighted to announce that Chris Udell has joined our team! 🎉 Chris Udell is our new Head of Business Development NDT. We will be working together to expand Mondaic’s offerings for ultrasound applications.

Local ground motion simulation using Salvus! https://lnkd.in/eqiYHivK Ground motion modeling is an extremely valuable tool for estimating local shaking intensity and identifying areas most at risk from seismic events. However, the point source earthquake approximation often used for distant events is generally not representative of ruptures on large, nearby fault planes.    The Standard Rupture Format (SRF) (Graves, 2014) was developed to define complex seismic sources on fault planes, giving a more accurate representation of the fault rupture. In this case study, we demonstrate the loading of an SRF file directly into Salvus, and the resulting simulation of ground motion through time, accounting for the influence of local topography. See the case study on our website for further details!   This work was carried out with Marisol Monterrubio Velasco, Josep de la Puente, Marta P. and others as part of the DT-GEO project.

Layered meshing with #Salvus!  Salvus 2024.1.x comes with a powerful new meshing engine for complex, multi-layered domains! We have a new tutorial demonstrating how to construct a mesh for Monterey Bay, California, using real topography and bathymetry data, and modelling the water layer.    See our tutorial at https://lnkd.in/eR43jeXk   To update to the latest version, see our documentation https://lnkd.in/ecib9djW 

📢 Paper Alert – Salvus User 📢 Complex Martinique Intermediate-Depth Earthquake Reactivates Early Atlantic Break-Up Structures  https://lnkd.in/dYzRe3EM    Compound earthquakes that rupture several faults are frequently observed within the shallow lithosphere (< 70 km depth) but are much more difficult to observe for intermediate-depth events (70 – 300 km depth). Such observations are even more challenging in locations with sparse seismic networks.    This study combines multiple different types of data and methods to analyse the 2007 magnitude 7.4 Martinique earthquake, revealing that the event likely re-activated a fossil ridge-transform structure. Salvus is used to simulate Green’s Functions using a recent 3D seismic velocity model, in order to improve the accuracy of the moment tensor solutions.    Figure: Overview of regional 3D full waveform inversion. Source mechanisms A-C correspond to a single fault assumption, and D-F to a doublet assumption – each a weighted assumption of the corresponding orange and green double couple mechanisms. Displayed waveform fits are the result of experiment F in respective colours.    Image source: Figure 3 from the paper; published under CC BY 4.0 https://lnkd.in/e365Whs    Disclaimer: This work was carried out by researchers from Karlsruhe Institute of Technology (KIT), University of East Anglia and Imperial College London. Mondaic was not directly involved in this research, but we are proud to see #Salvus being used in such an exciting project.    #FWI #earthquake  

Adjoint Waveform Tomography for Crustal and Upper Mantle Structure of the Middle East and Southwest Asia for Improved Waveform Simulations Using Openly Available Broadband Data #BSSA A new paper by scientists from Lawrence Livermore National Laboratory presents a model of seismic wave speeds for the crust and upper mantle of a broad region of the Middle East and southwest Asia, a tectonically complex part of the world. This model resolves subsurface structures using openly available data. Some examples include the imaging of a low crustal shear wave velocity zone in the Tethyan belt, and elevated shear wave velocity tracking Makran subduction beneath southwest Iran. The authors note that the model could be improved by incorporating data from regional networks. https://lnkd.in/giaxg_h9

How are you using Salvus? We’d love to know!    From modelling ultrasonic waves in manufactured components to running full-waveform inversion simulations on a global scale, we are eager to hear how you are using #Salvus, or what you would like to see from us in the future.     Form: https://lnkd.in/eKKWc7i5     Feedback from prospective users is also welcome!   

Digital Twins for #NDT and #SHM: https://lnkd.in/d-zMzdkH Spectral element simulations with Salvus rely on conforming hexahedral meshes, which enable order-of-magnitude speedups on graphic cards compared to conventional finite element methods. This case study describes how we are using Coreform Cubit to produce digital twins of CFRP (Caron Fibre-Reinforced Polymer) components. The software has helped us to produce high-quality meshes for complex geometries, eliminating problematic pinched elements and facilitating accurate #Salvus simulations of guided wave ultrasound, for material characterisation and defect detection. Figure: (Top) Initial mesh of T-stringer component, showing pinched elements within the central blue section; (Bottom) Final mesh, with improved conformity of element size and shape.

Mondaic at MUST 2024 in Amsterdam! Christian Boehm and Patrick Marty will both present at the International Workshop on Medical Ultrasound Tomography in Amsterdam, and #Salvus user Ines Ulrich will give a poster presentation. Details of their presentations can be found below:   Ines Ulrich (poster): Towards Multiparameter Full-Waveform Inversion for In-Vivo Ultrasound Computed Tomography Monday 10th June, 16:20 https://lnkd.in/e3XYqspB Patrick Marty (presentation): Coupled Viscoacoustic-Viscoelastic Spectral-Element Modeling for Transcranial Ultrasound Tuesday 11th June, 13:00 https://lnkd.in/eM_d-VpH Christian Boehm (plenary presentation): (Full)-Waveform Inversion Across the Scales Wednesday 12th June, 09:00 https://lnkd.in/eKHTCN_W #medical #ultrasound #usct #digitaltwin