Article
Engineering, Geological
P. L. Fantozzi, E. Paolucci, P. Pieruccini, D. Albarello
Summary: This study proposes a GIS-based numerical approach for automatically identifying and mapping specific landforms with seismic amplification effects based on geomorphological considerations, allowing empirical validation of existing proxies.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Ayele Chala, Richard Ray
Summary: This study aimed to assess the impact of different soil profiles on seismic site responses. The results demonstrated that site profiles with clay overlying bedrock exhibited higher seismic amplification and peak ground acceleration in comparison to site profiles with sand overlying bedrock.
PERIODICA POLYTECHNICA-CIVIL ENGINEERING
(2023)
Article
Geochemistry & Geophysics
Jacob Dafni, Joseph Wartman
Summary: This article presents analyses of select experiments from a comprehensive geotechnical centrifuge program to investigate topographic effects in single-sided slopes. The results indicate that resonance at the slope's topographic frequency is the principal driver of topographic effects. When topographic amplification occurs, the topographic zone of influence will vary depending on the ground-motion wavelength and the influence of phasing when multiple frequency components are present in the ground motion.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Khalid Bashir, Rajat Debnath, Rajib Saha
Summary: Considering future earthquakes, the vulnerability of Agartala city is increasing due to population density and infrastructure development. This study evaluates the local soil site effect and seismic vulnerability of a newly constructed flyover in Agartala. The results provide important observations for seismic design guidelines and may require revisions to existing codes.
Article
Geochemistry & Geophysics
Jacob Dafni, Joseph Wartman
Summary: This study used a geotechnical centrifuge experimental program to investigate topographic effects on single-sided slopes. The results showed that topography modified the frequency content and amplitude of ground motion, leading to significant changes in peak ground accelerations at the slope crest and determining the extent of the topographic zone of influence. The centrifuge proved to be a powerful experimental technique for systematically and repeatedly analyzing topographic effects.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Geography, Physical
Antonio Pignalosa, Giovanni Forte, Paolo Budetta, Antonio Santo
Summary: The Central Italy earthquake in 2016 caused numerous landslides, particularly in the San Pellegrino di Norcia area. Researchers conducted a detailed study on the triggering mechanisms and propagation dynamics of rockfalls by collecting field data and using UAV imagery for terrain modeling. The results highlighted the significant role of topography in landslide triggering.
Article
Geochemistry & Geophysics
Brennan Brunsvik, Gabriele Morra, Gabriele Cambiotti, Lauro Chiaraluce, Raffaele Di Stefano, Pasquale De Gori, David A. Yuen
Summary: By applying unsupervised clustering techniques to earthquake hypocenters, the 3D rupture morphology of faults is revealed, providing important data for seismic modeling and helping to calculate phenomena such as stress changes.
Article
Engineering, Geological
J. P. Diaz, E. Saez, M. Monsalve, G. Candia, F. Aron, G. Gonzalez
Summary: This study proposes a novel machine learning-based methodology to map the degree of seismic amplification in Chile. The method integrates qualitative and quantitative data, such as surface shear wave velocities and predominant frequencies, with gravity anomaly maps. The results show improved accuracy in seismic amplification mapping and estimation of Vs30 and f0. Machine learning algorithms, trained with spatial covariates, demonstrate great potential for digital soil mapping and surpass traditional geostatistical techniques.
ENGINEERING GEOLOGY
(2022)
Article
Geochemistry & Geophysics
Kristin J. Ulmer, Adrian Rodriguez-Marek, Russell A. Green
Summary: This study discusses the issue of uncertainty in seismic hazard analysis and proposes a modified method to address the potential statistical smoothing and decreased computed hazard that may result from the weighted average approach.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Engineering, Geological
Gerardo M. Verderame, Santa Anna Scala, Carlo Del Gaudio
Summary: The aim of this study is to describe the evolution of vulnerability over the years for masonry buildings with a good quality layout and/or regular texture. The analysis considers data collected shortly after the L'Aquila 2009 earthquake, and damage analysis is done based on 5 + 1 damage grades defined for the whole building. The study reveals the influence of construction age and horizontal structural types on vulnerability and derives vulnerability curves through statistical modeling.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Geosciences, Multidisciplinary
Sujan Raj Adhikari, Sheri Molnar, Jinfei Wang
Summary: The goal of the seismic microzonation mapping project in Greater Vancouver is to produce inclusive seismic hazard maps considering local site effects such as one-dimensional site response, three-dimensional Georgia sedimentary basin amplification, liquefaction, and landslide hazard potential. The study evaluates the impact of different seismic site characterization measures on microzonation mapping and communication in the area. The comparison of seismic microzonation maps based on different site parameters shows that the classification schemes with greater class divisions are beneficial for effectively communicating the variability in seismic site conditions. It is recommended to use either one hybrid classification map or two classification maps of Vs(30) and T-0 together for effective communication of the seismic microzonation of Greater Vancouver.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
M. Picozzi, D. Spallarossa, A. G. Iaccarino, D. Bindi
Summary: We investigated the preparatory phase of the 2009 L'Aquila earthquake by analyzing the relationship between seismic moment and radiated energy. Our findings showed a correlation between energy index and seismic activity.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Geological
Khalid Mahmood, Bakht Zamin, Shahid Iqbal, Zia-Ur-Rehman, Sher Afzal, Muhammad Safdar, Qaiser Iqbal, Arshad Ali
Summary: This study evaluates the impact of local site conditions on seismic hazard and provides improved and site-specific values of ground acceleration for the new Balakot town in Pakistan.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
Volkan Ozsarac, Monteiro Ricardo, Aysegul Askan, Gian Michele Calvi
Summary: This study aims to assess the impact of local site effects on the risk assessment of reinforced concrete bridges. Local site amplification was incorporated using site response analysis, and p-y models were used to consider foundation flexibility. The results show that when the fundamental periods of the bridge structure and site are close, there is an increase in displacement demands on bridge piers, potentially leading to higher direct seismic losses.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Environmental Sciences
Luo Yong-hong, Xu Qiang, Zhan Wei-wei, Gerardo Grelle
Summary: This study focuses on the accurate prediction of ground motions in mountainous areas, which is crucial for managing seismic risk in urban cities near mountains. Through the application of a hybrid model, the study computes the multispectral seismic topographic amplification maps in a case study town located in the Qingchuan-Pingwu fault zone, Southwest China. The results show the occurrence of strong topographic amplification effects at distinct slope locations and suggest that both topographic and stratigraphic effects should be considered in comprehensive seismic hazard assessment.
JOURNAL OF MOUNTAIN SCIENCE
(2022)
Article
Engineering, Multidisciplinary
Maria Rosaria Gallipoli, Tony Alfredo Stabile, Giulia Massolino, Marco Mucciarelli, Nasser Abu Zeid, Leonardo Chiauzzi, Samuel Bignardi, Alessandro Rebez
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2020)
Article
Geochemistry & Geophysics
G. M. Adinoldi, M. Picozzi, S. Cesca, S. Heimann, A. Zollo
JOURNAL OF SEISMOLOGY
(2020)
Article
Geochemistry & Geophysics
Dino Bindi, Daniele Spallarossa, Matteo Picozzi, Paola Morasca
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2020)
Article
Geochemistry & Geophysics
Matteo Picozzi, Dino Bindi, Gaetano Festa, Fabrice Cotton, Antonio Scala, Nicola D'Agostino
Summary: This study estimates the source parameters of small-magnitude earthquakes in the Irpinia faults area in southern Italy from 2008 to 2020. By applying a spectral decomposition approach, the source contribution is isolated from propagation and site effects. The study reveals the spatial distribution of stress drop, fracture energy, and the relationship between source parameters and fault mechanical properties. The study also compares the time evolution of source parameters with geodetic displacement, indicating the influence of poroelastic deformation on earthquake occurrence and rupture characteristics.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2022)
Article
Geochemistry & Geophysics
Dino Bindi, Hoby N. T. Razafindrakoto, Matteo Picozzi, Adrien Oth
Summary: The study examines the impact of a depth-dependent attenuation model on source parameters evaluated through spectral decomposition, focusing on the correlation between hypocentral depth and average stress drop. Results show that different parameterizations of the attenuation term lead to systematic differences in spectral attenuation curves with distance, depth, and frequency, affecting stress drop values for earthquakes deeper than 7 km. The increase of stress drop with depth is confirmed even after accounting for shear velocity increase and is supported by a model for the gradient of effective normal stress, indicating the importance of lateral variability of crustal attenuation properties in ground-shaking variability.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2021)
Article
Geochemistry & Geophysics
Matteo Picozzi, Fabrice Cotton, Dino Bindi, Antonio Emolo, Guido Maria Adinolfi, Daniele Spallarossa, Aldo Zollo
Summary: Fault zones are significant sources of hazard in many populated regions. Researchers are increasingly studying fault properties to detect signs of stress accumulation and strength weakening. In this study, the researchers analyze microseismicity detected by dense seismic networks in Southern Italy and obtain a detailed picture of the evolution of fault properties in both time and space. They also discuss the relationship between ground-motion intensity and the source parameters of the microseismicity. The findings reveal a coherent spatial distribution between ground-motion intensity and corner frequency, stress drop, and radiation efficiency, as well as an annual cycle in ground-motion intensity.
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2022)
Article
Energy & Fuels
Antonio Scala, Guido Maria Adinolfi, Matteo Picozzi, Francesco Scotto di Uccio, Gaetano Festa, Grazia De Landro, Enrico Priolo, Stefano Parolai, Rosario Riccio, Marco Romanelli
Summary: This paper discusses the challenges of seismic monitoring in areas where induced earthquakes could occur, highlighting the importance of developing high-quality monitoring networks and using advanced data mining strategies. An experiment with a small-aperture seismic array installation demonstrated the effectiveness of enhancing seismic monitoring accuracy and reducing magnitude completeness.
Article
Geosciences, Multidisciplinary
M. Picozzi, D. Spallarossa, A. G. Iaccarino, D. Bindi
Summary: We investigated the preparatory phase of the 2009 L'Aquila earthquake by analyzing the relationship between seismic moment and radiated energy. Our findings showed a correlation between energy index and seismic activity.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geochemistry & Geophysics
Matteo Picozzi, Daniele Spallarossa, Dino Bindi, Antonio Giovanni Iaccarino, Eleonora Rivalta
Summary: This study investigates the crustal strength before and after the three largest earthquakes of the 2016 seismic sequence in central Italy, using data from approximately 23,000 microearthquakes between 2005 and 2016. The results show that the dynamic characteristics of microearthquakes can be used as indicators of stress change in the crust and can be utilized to monitor the seismic hazard of a region.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2022)
Article
Geochemistry & Geophysics
Dino Bindi, Daniele Spallarossa, Matteo Picozzi, Adrien Oth, Paola Morasca, Kevin Mayeda
Summary: This study evaluates the uncertainties of seismic moment M0 and corner frequency f for earthquakes of the 2019 Ridgecrest sequence. The choice of attenuation model has a strong impact on f estimates, as well as the duration of the window used to compute the Fourier spectra. The uncertainties of the source parameters provided by the fitting procedure might underestimate the model-related (epistemic) uncertainty.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
Dino Bindi, Daniele Spallarossa, Matteo Picozzi, Adrien Oth, Paola Morasca, Kevin Mayeda
Summary: In this study, a spectral decomposition approach is utilized to isolate the source spectra of 556 events that occurred during the 2019 Ridgecrest sequence. Multiple decompositions are performed by introducing alternative choices for various processing and model assumptions. Estimates of seismic moment and corner frequency are obtained, and a comprehensive archive of source spectra, site amplifications, attenuation models, and source parameters is made available. Different approaches to measure the precision of the parameters are compared.
SEISMOLOGICAL RESEARCH LETTERS
(2023)
Article
Geochemistry & Geophysics
A. G. Iaccarino, M. Picozzi
Summary: This paper investigates the seismic activity preceding 19 moderate earthquakes in The Geysers, Northern California, aiming to verify the existence of a preparatory phase before their occurrence. The analysis shows that there is a common preparatory phase for 11 events, and another five events have different characteristics. The duration of the preparatory process ranges between about 16 hours and four days. There is also a clear correlation between events with a preparation phase and the location of injection's wells.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Multidisciplinary Sciences
Matteo Picozzi, Antonio Giovanni Iaccarino
Summary: Earthquake prediction has long been a challenge in seismology, but recent advances in machine learning and dense seismic networks have brought new hope. Studies have shown the existence of a preparatory phase before earthquakes, which is crucial for mitigating seismic risk.
Article
Geosciences, Multidisciplinary
Gaetano Festa, Guido Maria Adinolfi, Alessandro Caruso, Simona Colombelli, Grazia De Landro, Luca Elia, Antonio Emolo, Matteo Picozzi, Antonio Scala, Francesco Carotenuto, Sergio Gammaldi, Antonio Giovanni Iaccarino, Sahar Nazeri, Rosario Riccio, Guido Russo, Stefania Tarantino, Aldo Zollo
Summary: The study provided detailed location and characterization of events of the 2020 Irpinia seismic sequence, showing that the sequence ruptured an asperity with a size of about 800 m along a fault structure compatible with the main segment of the 1980 Irpinia earthquake, with low stress drop indicating a fluid-driven initiation mechanism. The performance of earthquake early warning systems during the sequence was evaluated, revealing a minimum blind zone size of about 15 km in the area.
Article
Geochemistry & Geophysics
Antonio Giovanni Iaccarino, Matteo Picozzi, Dino Bindi, Daniele Spallarossa
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2020)