Hoby N. T. Razafindrakoto

Identification of Earthquakes and Anthropogenic Events in Madagascar Open

Hoby N. T. Razafindrakoto, Andriniaina Tahina Rakotoarisoa · 2024

Earthquake catalog is a key element in seism hazards. However, it may be contaminated by non-natural earthquake sources. Hence,This study aims to discriminate natural and non-natural earthquakes through machine learning techniques and spat…

Application of Spectral Decomposition approach to examine the attenuation, source parameters, and site effects in Madagascar Open

Manitriniaina Ravoson, Hoby N. T. Razafindrakoto · 2024

A spectral decomposition approach is applied to separate the site amplification, path attenuation, and source parameters of earthquakes that occurred in Madagascar between 2011 and 2013. Concerning source parameters, the stress drop is der…

Recent Advances in Earthquake Monitoring in Madagascar Open

Andriniaina Tahina Rakotoarisoa, Hoby N. T. Razafindrakoto · 2024

Earthquakes are acknowledged as a potent force of nature that can cause substantial harm to populations and result in widespread damage. Therefore, having a seismic public alerting system is crucial for swiftly broadcasting warnings to the…

Ground Motion Variability from Simulation Perspective Open

Hoby N. T. Razafindrakoto, Fabrice Cotton, Sreeram Reddy Kotha, Dino Bindi, Graeme Weatherill , et al. · 2023

Ground motion variability is often left aside in the validation framework of physics-based ground motion simulation. In this study, we evaluate how the distributions of model parameters control ground-motion va…

Hazard-informed optimization of seismic networks for earthquake early warning—the case of the Lower Rhine Embayment (western Germany) Open

Bita Najdahmadi, Marco Pilz, Dino Bindi, Hoby N. T. Razafindrakoto, Adrien Oth , et al. · 2023

Earthquake early warning (EEW) systems can serve as a viable solution to protect specific hazard‐prone targets (major cities or critical infrastructure) against harmful seismic events. Using the example of the Lower Rhine Embayment (wester…

Regional Calibration of Hybrid Ground-Motion Simulations in Moderate Seismicity Areas: Application to the Upper Rhine Graben Open

Hoby N. T. Razafindrakoto, Fabrice Cotton, Dino Bindi, Marco Pilz, Robert Graves , et al. · 2021

This study presents the coupling of the spectral decomposition results for anelastic attenuation, stress drop, and site effects with the Graves-Pitarka (GP) hybrid ground-motion simulation methodology, as implemented on the Southern Califo…

Robust, an Earthquake Early Warning System in the Lower Rhine Embayment, Germany Open

Bita Najdahmadi, Marco Pilz, Dino Bindi, Hoby N. T. Razafindrakoto, Adrien Oth , et al. · 2021

<p>The Lower Rhine Embayment in western Germany is one of the most important areas of earthquake recurrence north of the Alps, facing a moderate level of seismic hazard in the European context but a significant level of risk due to a…

Embedding Spectral Decomposition Results in Broadband Simulation: Application to Rhine Graben Area Open

Hoby N. T. Razafindrakoto, Fabrice Cotton, Dino Bindi, Marco Pilz, Robert Graves · 2021

<p>Over the past decade, there is growing consensus that physics-based simulations can be utilized in engineering applications. However, for the simulations to be accepted, they need to be calibrated and validated. This study present…

Regional broad-band ground-shaking modelling over extended and thick sedimentary basins: an example from the Lower Rhine Embayment (Germany) Open

Marco Pilz, Fabrice Cotton, Hoby N. T. Razafindrakoto, Graeme Weatherill, Thomas Spies · 2020

The simulation of broad-band (0.1 to 10 + Hz) ground-shaking over deep and spatially extended sedimentary basins at regional scales is challenging. We evaluate the ground-shaking of a potential M 6.5 earthquake in the southern Lower Rhine …

The seismic sound of deep volcanic processes Open

Simone Cesca, Torsten Dahm, Sebastian Heimann, Martin Hensch, Jean Letort , et al. · 2020

<p>Deep volcanic processes and magma intrusion episodes through the crust are typically accompanied by a variety of seismic signals, including volcano-tectonic (VT) seismicity, very long period (VLP) signals and deep low-frequency (D…

Seismic catalogues of the 2018-2019 volcano-seismic crisis offshore Mayotte, Comoro Islands Open

Simone Cesca, Sebastian Heimann, Jean Letort, Hoby N. T. Razafindrakoto, Torsten Dahm , et al. · 2020

In May 2018 a volcano-seismic sequence accompanied the upward migration of a magmatic intrusion from Moho depth to the seafloor led to the drainage of the deep magmatic reservoir and to the birth of a submarine volcano offshore the island …

Seismic risk analysis in Germany: an example from the Lower Rhine Embayment. Final report Open

Marco Pilz, Cecilia I. Nievas, Fabrice Cotton, Karsten Prehn, Hoby N. T. Razafindrakoto , et al. · 2020

The Lower Rhine Embayment in western Germany is one of the most important areas of earthquake recurrence north of the Alps, facing a moderate level of seismic hazard in the European context but a significant level of risk. This study deals…

Drainage of a deep magma reservoir near Mayotte inferred from seismicity and deformation Open

Simone Cesca, Jean Letort, Hoby N. T. Razafindrakoto, Sebastian Heimann, Eleonora Rivalta , et al. · 2020

Very long period signals and seismic swarm activity offshore Mayotte, Comoro Islands Open

Simone Cesca, Jean Letort, Hoby N. T. Razafindrakoto, Sebastian Heimann, Eleonora Rivalta , et al. · 2019

Toolkit for bootstrap-based probabilistic dislocation source optimisation from heterogeneous datasets: Analysis of Mayotte Island swarm activity and volcanic uplift in Iceland Open

Marius Paul Isken, Sebastian Heimann, Henriette Sudhaus, Daniela Kühn, Andreas Steinberg , et al. · 2019

GMSimViz: Automated 3D Visualization of Ground Motion Simulation with Generic Mapping Tools (GMT) Open

Viktor Polak, Yuezhang Zhu, Sung Eun Bae, Jason Motha, Brendon Bradley , et al. · 2019

Polak et al., (2019). GMSimViz: Automated 3D Visualization of Ground Motion Simulation with Generic Mapping Tools (GMT). Journal of Open Source Software, 4(35), 808, https://doi.org/10.21105/joss.00808

GMSim Viz: Automated 3D Visualization of Ground Motion Simulation and Consequent Impacts Open

Sung Eun Bae, Viktor Polak, Melody Zhu, Jason Motha, Brendon Bradley , et al. · 2018

Overview \nGMSimViz is an automation tool that produces an animated 3D visualization of geological faults, ground motion and other earthquake-related data. Typically verification of ground motion simulations involves various data visualiza…

Simplified-Physics High Frequency Ground-Motion Simulations Using Site-Specific Parameters Open

J.C. Vyas, Brendon Bradley, Hoby N. T. Razafindrakoto, Ethan M. Thomson, Robin Lee · 2018

Hybrid broadband simulation methods typically compute high-frequency portion of ground-motions using a simplified-physics approach (commonly known as “stochastic method”) using the same 1D velocity profile, anelastic attenuation profile an…

Strong ground motion observations of engineering interest from the 14 November 2016 Mw7.8 Kaikōura, New Zealand earthquake Open

Brendon Bradley, Hoby N. T. Razafindrakoto, M. Ahsan Nazer · 2017

This paper provides a brief discussion of observed strong ground motions from the 14 November 2016 Mw7.8 Kaikōura earthquake. Specific attention is given to examining observations in the near-source region where several ground motions exce…

The Earthquake‐Source Inversion Validation (SIV) Project Open

P. Martín, Danijel Schorlemmer, M. T. Page, Jean‐Paul Ampuero, Kimiyuki Asano , et al. · 2016

Finite-fault earthquake source inversions infer the (time-dependent) displacement on the rupture surface from geophysical data. The resulting earthquake source models document the complexity of the rupture process. However, multiple source…

Hybrid Broadband Ground Motion Simulations of Porters Pass Earthquakes Open

M. Ahsan Nazer, Brendon Bradley, Hoby N. T. Razafindrakoto · 2016

We present ground motion simulations of the Porters Pass (PP) fault in the Canterbury region of New Zealand; a major active source near \nChristchurch city. The active segment of the PP fault has an inferred length of 82 km and a mostly st…

Broadband ground motion simulation of the 2010-2011 Canterbury earthquake sequence Open

Hoby N. T. Razafindrakoto, Brendon Bradley, Robert Graves · 2016

In this paper, we perform hybrid broadband (0-10 Hz) ground motion \nsimulations for the ten most significant events (Mw 4.7-7.1) in the 2010-2011 Canterbury \nearthquake sequence. Taking advantage of having repeated recordings at same sta…

Ground Motion Simulation Validation using Small-to-Moderate Magnitude Events in the Canterbury, New Zealand Region Open

Robin Lee, Brendon Bradley, Seokho Jeong, Hoby N. T. Razafindrakoto, Ethan M. Thomson · 2016

This poster presents work to date on ground motion simulation validation and inversion for the Canterbury, New Zealand region. \nRecent developments have focused on the collection of different earthquake sources and the verification of the…

Quantifying variability in earthquake rupture models using multidimensional scaling: application to the 2011 Tohoku earthquake Open

Hoby N. T. Razafindrakoto, P. Martín, Marc G. Genton, Ling Zhang, K. K. S. Thingbaijam · 2015

Finite-fault earthquake source inversion is an ill-posed inverse problem leading to non-unique solutions. In addition, various fault parametrizations and input data may have been used by different researchers for the same earthquake. Such …

Hybrid broadband simulations of the 2010-2011 Canterbury earthquakes Open

Hoby N. T. Razafindrakoto, Brendon Bradley, Ethan M. Thomson, Robert Graves · 2015

New Insights on the Uncertainties in Finite-Fault Earthquake Source Inversion Open

Hoby N. T. Razafindrakoto · 2015

New Insights on the Uncertainties in Finite-Fault Earthquake Source Inversion Hoby Njara Tendrisoa Razafindrakoto Earthquake source inversion is a non-linear problem that leads to non-unique solutions. The aim of this dissertation is to un…

Hoby N. T. Razafindrakoto YOU? Author Swipe