Fabrice Cotton

Fabrice Cotton
Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ | GFZ · Division of Seismic Hazards and Stress Field

Professor Potsdam University

About

346
Publications
99,966
Reads
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11,449
Citations
Additional affiliations
September 2014 - May 2016
Helmholtz-Zentrum Potsdam - Deutsches GeoForschungsZentrum GFZ
Position
  • Head of Department
September 2001 - present
Université Joseph Fourier - Grenoble 1
September 2001 - September 2014
University Joseph Fourier - Grenoble 1
Position
  • Professor (Full)

Publications

Publications (346)
Article
In site-specific site response assessments, observation-based site-specific approaches requiring a target-reference recording pair or a regional recording network cannot be implemented at many sites of interest. Thus, various estimation techniques have to be utilized. How effective are these techniques in predicting site-specific site responses (av...
Conference Paper
Full-text available
Strong ground motion can generate a large dynamic strain in shallow materials, lead to a nonlinear response, and cause permanent damage in near-surface materials. The nonlinear behavior of soils subjected to strong vibrations leads to an increase in wave attenuation and a decrease in shear modulus. These effects lead to a decrease in the resonance...
Article
Full-text available
Plain Language Summary Large earthquakes modify the state of stress and pore pressure in the upper crust and mantle. These changes induce stress relaxation processes and pore pressure diffusion in the postseismic phase. The two main stress relaxation processes are postseismic slip along the rupture plane of the earthquake and viscoelastic deformati...
Article
Full-text available
In this article we describe EPOS Seismology, the Thematic Core Service consortium for the seismology domain within the European Plate Observing System infrastructure. EPOS Seismology was developed alongside the build-up of EPOS during the last decade, in close collaboration between the existing pan-European seismological initiatives ORFEUS (Observa...
Article
We construct and examine the prototype of a deep learning-based ground-motion model (GMM) that is both fully data driven and nonergodic. We formulate ground-motion modeling as an image processing task, in which a specific type of neural network, the U-Net, relates continuous, horizontal maps of earthquake predictive parameters to sparse observation...
Article
Full-text available
In seismic risk assessment, the sources of uncertainty associated with building exposure modelling have not received as much attention as other components related to hazard and vulnerability. Conventional practices such as assuming absolute portfolio compositions (i.e., proportions per building class) from expert-based assumptions over aggregated d...
Article
Full-text available
The creation of building exposure models for seismic risk assessment is frequently challenging due to the lack of availability of detailed information on building structures. Different strategies have been developed in recent years to overcome this, including the use of census data, remote sensing imagery and volunteered graphic information (VGI)....
Article
Full-text available
Ground-motion models (GMMs) are often used to predict the random distribution of Spectral accelerations (SAs) at a site due to a nearby earthquake. In probabilistic seismic hazard and risk assessment, large earthquakes occurring close to a site are considered as critical scenarios. GMMs are expected to predict realistic SAs with low within-model un...
Article
The main Marmara fault (MMF) extends for 150 km through the Sea of Marmara and forms the only portion of the North Anatolian fault zone that has not ruptured in a large event (Mw>7) for the last 250 yr. Accordingly, this portion is potentially a major source contributing to the seismic hazard of the Istanbul region. On 26 September 2019, a sequence...
Article
Full-text available
Earthquake site responses or site effects are the modifications of surface geology to seismic waves. How well can we predict the site effects (average over many earthquakes) at individual sites so far? To address this question, we tested and compared the effectiveness of different estimation techniques in predicting the outcrop Fourier site respons...
Article
Full-text available
Typical seismic ground-motion models predict the response spectral ordinates (GMM-SA), which are the damped responses of a suite of single-degree-of-freedom oscillators. Response spectra represent the response of an idealized structure to input ground-motion, but not the physics of the actual ground-motion. To complement the regionally adaptable GM...
Article
Fault zones are major sources of hazard for many populated regions around the world. Earthquakes still occur unanticipated, and research has started to observe fault properties with increasing spatial and temporal resolution, having the goal of detecting signs of stress accumulation and strength weakening that may anticipate the rupture. The common...
Article
Full-text available
The within-site variability in site response is the randomness in site response at a given site from different earthquakes and is treated as aleatory variability in current seismic hazard/risk analyses. In this study, we investigate the single-station variability in linear site response at K-NET and KiK-net stations in Japan using a large number of...
Article
Full-text available
We propose the use of variable resolution boundaries based on central Voronoi tessellations (CVTs) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazards presents intensity measures with contrasting footprints a...
Article
One-dimensional (1D) site response analysis dominates earthquake engineering practice, while local 2D/3D models are often required at sites where the site response is complex. For such sites, the 1D representation of the soil column can account neither for topographic effects or dipping layers nor for locally generated horizontally propagating surf...
Preprint
Full-text available
In site response assessments, observation-based site-specific approaches requiring a target-reference recording pair or a recording network cannot be implemented at many sites of interest. Thus, various estimation techniques have to be utilized. How effective are these techniques in predicting site-specific site responses (average over many earthqu...
Article
Early warning is a critical potential tool for mitigating the impacts of large mass wasting and flood events, a major hazard in the Himalaya. We used data from a dense seismic network in Uttarakhand, India, to detect and track a fatal rockslide to mass flow to flood cascade and examine the potential for regional networks to provide early warning fo...
Article
Ground motion with strong-velocity pulses can cause significant damage to buildings and structures at certain periods; hence, knowing the period and velocity amplitude of such pulses is critical for earthquake structural engineering. However, the physical factors relating the scaling of pulse periods with magnitude are poorly understood. In this st...
Article
Full-text available
Well-constrained earthquake depth estimations are important for seismic hazard determination. As local networks of the East-African Rift are usually too sparse for reliable depth estimations, we used detections of pP and sP phase arrivals (the so-called depth phases) at teleseismic distance to constrain earthquake depths in this region. We rely on...
Conference Paper
Full-text available
Ground response analyses (GRA) are widely carried out in routine engineering practice to evaluate the effects of local geology on ground motions. GRA models vertically incident SH waves propagating through a laterally homogenous medium assuming either linear, equivalent linear or fully nonlinear stress-strain behaviour (referred to as "1DSH" modell...
Conference Paper
Full-text available
Assessment of seismic hazard and risk at a European scale presents many challenges in terms of both the characterization of the ground motion across a diversity of tectonic environments, as well as the need to incorporate site amplification for loss assessment. Previous pan-European seismic hazard models, including the 2013 European Seismic Hazard...
Conference Paper
Full-text available
Although the techniques and methods to assess ground-motion worldwide have improved significantly during the last decades, the uncertainties and the variabilities related to ground-motion at a given site are still high. One of the key challenges in seismology is to be able to analyse and calibrate the physical factors that control earthquake ground...
Conference Paper
Full-text available
Inspired by similarities of seismic and acoustic signals, we take advantage of the expertise developed in the field of music information retrieval and audio signal processing. A seismic waveform is the record of Earth vibrations, which, in terms of signal properties and generation mechanism, can be seen to be similar to sound signals generated by m...
Article
We estimate the source parameters of small-magnitude earthquakes that occurred during 2008–2020 in the Irpinia faults area (southern Italy). We apply a spectral decomposition approach to isolate the source contribution from propagation and site effects for ∼3000 earthquakes in the local magnitude range between ML 0 and 4.2. We develop our analyses...
Article
Full-text available
Volcanic tremor signals are usually observed before or during volcanic eruptions and must be monitored to evaluate the volcanic activity. A challenge in studying seismic signals of volcanic origin is the coexistence of transient signal swarms and long-lasting volcanic tremor signals. Separating transient events from volcanic tremors can, therefore,...
Preprint
Full-text available
To address the question of how well we can predict the repeatable site responses (average over many earthquakes) at individual sites, we tested and compared the effectiveness of different estimation techniques using a unique benchmark dataset. Evaluated approaches include 1D ground response analysis (GRA), the square-root-impedance (SRI) method (al...
Preprint
Full-text available
Ground-motion models (GMMs) are often used to predict the random distribution of spectral accelerations (SAs) at a site due to an earthquake at a distance. In probabilistic seismic hazard and risk assessment, large earthquakes occurring close to a site are considered as critical scenarios. GMMs are expected to perform well for such rare scenarios i...
Article
We explore nonlinear site effects in the new Japanese ground-motion dataset compiled by Bahrampouri et al. (2020). Following the approach of Seyhan and Stewart (2014), we evaluate the decrease of soil amplification according to the increasing and corresponding ground motion on surface rock (VS30=760 m/s). To better predict the rock ground motion as...
Preprint
Full-text available
The within-site variability in site response is the randomness in site response at a given site from different earthquakes and is considered to be aleatory in seismic hazard/risk analyses. In this study, we investigate the single-station variability in linear site response at K-NET and KiK-net stations in Japan using a large number of earthquake re...
Article
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 California Earthquake Center (SCEC) broadband platform (BBP). It is targeted to applications in the Upper Rhine grabe...
Preprint
Full-text available
Typical ground-motion models predict the response spectral ordinates (GMM-SA), which are the damped responses of a suite of single-degree-of-freedom oscillators. Response spectra represent the response of an idealized structure to input ground-motion, but not the physics of the actual ground-motion. To complement the regionally adaptable GMM-SA of...
Article
In this article, we address the question of how observed ground‐motion data can most effectively be modeled for engineering seismological purposes. Toward this goal, we use a data‐driven method, based on a deep‐learning autoencoder with a variable number of nodes in the bottleneck layer, to determine how many parameters are needed to reconstruct sy...
Preprint
Full-text available
We propose the use of variable resolution boundaries based on Central Voronoi Tessellations (CVT) to spatially aggregate building exposure models for risk assessment to various natural hazards. Such a framework is especially beneficial when the spatial distribution of the considered hazards present intensity measures with contrasting footprints and...
Article
Full-text available
The aim of this study is to conduct a probabilistic seismic hazard analysis and spatial variation of seismic hazard at the surface level for Northeast of Algeria, covering 4°E–9°E, 33°N–38°N. The most recent peak ground acceleration (PGA) attenuation relationship, along with the updated seismic catalog and the best knowledge on the seismic activity...
Article
A method is proposed to identify within seismic catalogs those earthquakes that are most relevant to the seismic hazard. The approach contrasts with the classical approach to decluster the seismic catalog with the expectation that the remaining main shocks will be the relevant events for the seismic hazard analysis. We apply a time window like in t...
Article
This article describes an open-source site database for a total number of 1742 earthquake recording sites in the K-NET (Kyoshin network) and KiK-net (Kiban Kyoshin network) networks in Japan. This database contains site characterization parameters directly derived from available velocity profiles, including average wave velocities, bedrock depths,...
Preprint
Full-text available
In seismic risk assessment the sources of uncertainty associated to building exposure modelling have not received as much attention as other components related to hazard and vulnerability. We are introducing that the degree of knowledge of a building portfolio can be described within a Bayesian probabilistic approach to acknowledge the epistemic un...
Article
Full-text available
We have kindly received the comments by Hamdache and Pelàez on our published paper (Hamidatou et al. 2019); This article will give us the opportunity to provide more explanation and clarifications on the methodology followed during our work. We find these comments and critiques helpful for our future works. However, most of them were generated from...
Article
Full-text available
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 Embayment, one of the most important areas of earthquake recurrence north of the Alps, close to the city of Col...
Article
Full-text available
Ground response analyses (GRA) model the vertical propagations of SH waves through flat-layered media (1DSH) and are widely carried out to evaluate local site effects in practice. Horizontal-to-vertical spectral ratio (HVSR) technique is a cost-effective approach to extract certain site-specific information, e.g., site fundamental frequency (f0), b...
Article
Full-text available
In this study, we investigate the dependencies between ground-motion intensity measures (GMIM) and earthquake magnitudes (M), in order to evaluate the dynamic stress parameter (Δσ) magnitude scaling. To achieve this, two types of datasets are used: a large subset of the NGA-West 2 (next generation attenuation) dataset including 1700 records from 42...