Article
Engineering, Civil
N. Simon Kwong, Kishor S. Jaiswal
Summary: The need to report estimates of epistemic uncertainties in the hazard, such as fractile hazard curves, in all forthcoming releases of US Geological Survey (USGS) National Seismic Hazard Models (NSHMs) is increasing. This article addresses the need to help end-users understand these uncertainties and their potential uses by characterizing epistemic uncertainties in recent updates of the USGS NSHM, illustrating applications of fractile hazard curves, and discussing implications of uncertainties. The study finds that the epistemic uncertainty in hazard is generally larger for Hawaii than for California, and proposes models for generating approximate fractile hazard curves in both regions. An open-source interactive tool was developed to enable users to independently explore and utilize these uncertainties for their applications.
EARTHQUAKE SPECTRA
(2023)
Article
Engineering, Geological
Juan Andres Jarufe Troncoso, Sebastian Perez, Juan Pablo Hurtado, Carlos Cifuentes
Summary: This study aims to develop a method to evaluate the probability of maximum seismic events based on the synthetic distribution of seismic data and numerical modelling results.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
S. -k. Kufner, L. Bie, Y. Gao, M. Lindner, H. Waizy, N. Kakar, A. Rietbrock
Summary: On June 21st, a Mw6.2 earthquake occurred in the Afghan-Pakistan-border-region, which is within the India-Asia collision zone. It resulted in 1,039 deaths, making it the deadliest earthquake in 2022. By combining seismological and geodetic observations, we investigated the rupture processes and found that a sinistral rupture with maximum slip of 1.8 m occurred on a N20 degrees E striking, sub-vertical fault at 5 km depth. Our findings suggest that both external factors and fault-specific factors contributed to the high destructiveness of this event.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Civil
Tiegan E. Hobbs, J. Murray Journeay, Anirudh S. Rao, Michal Kolaj, Luis Martins, Philip LeSueur, Michele Simionato, Vitor Silva, Marco Pagani, Kendra Johnson, Drew Rotheram, William Chow
Summary: Canada has developed a national seismic risk model through a partnership with the Global Earthquake Model Foundation to assess the impacts and consequences of future natural-hazard events. The model includes a national exposure inventory, Canadian-specific fragility and vulnerability curves, and a simplified version of the Canadian Seismic Hazard Model. Using the OpenQuake Engine, probabilistic stochastic risk modeling is completed to assess seismic risk at the neighborhood level for all settled areas in Canada. The results provide evidence for decision-making at local, regional, and national levels.
EARTHQUAKE SPECTRA
(2023)
Article
Geosciences, Multidisciplinary
Laxmi Gupta, Navdeep Agrawal, Jagabandhu Dixit
Summary: Probabilistic seismic hazard analysis was conducted for the seismically active National Capital Region (NCR) of India to quantify peak ground acceleration (PGA) values. The results showed varying PGA values in different probability exceedances, with higher seismicity observed in the eastern and southeastern regions due to proximity to active fault zones.
GEOMATICS NATURAL HAZARDS & RISK
(2021)
Article
Multidisciplinary Sciences
Patrick Oswald, Michael Strasser, Christa Hammerl, Jasper Moernaut
Summary: The study suggests that severe earthquakes triggered large prehistoric rockslides in the Eastern Alps, with preceding seismic activity potentially weakening the rock slopes leading up to the events. This highlights the role of seismicity in preparing and triggering catastrophic rockslides in the region, shedding light on the relationship between earthquakes and large rockslides in clustered environments.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
Mouloud Hamidatou, Yahia Mohammedi, Nassim Hallal, Abdlkrim Yelles-Chaouche, Saad Lebdioui, Itharam Thallak, Dietrich Stromeyer, Omar Khemici
Summary: The comments and critiques received were helpful for future works, but most of them stemmed from misapprehension of the paper, including issues related to the seismic source zone model, PGA values, and logic tree usage.
PURE AND APPLIED GEOPHYSICS
(2021)
Article
Geochemistry & Geophysics
Q. J. Gutierrez Pena, F. A. Nava Pichardo, E. Glowacka, R. R. Castro Escamilla, V. H. Marquez Ramirez
Summary: The study proposes the use of statistical measures to quantify the robustness, uncertainty, and significance of seismic systems modeled by Markovian models. A method for selecting the best model using normalized measures is also suggested. Testing on earthquake data from Japan showed that seismic events within a specific magnitude range exhibit Markovian behavior.
PURE AND APPLIED GEOPHYSICS
(2021)
Article
Engineering, Geological
A. Sandoli, G. Brandonisio, G. P. Lignola, A. Prota, G. Fabbrocino
Summary: This paper presents a novel approach to estimate the seismic vulnerability of large-scale urban areas. The method involves selecting an appropriate intensity measure, using matrix transformation to calculate structural safety, and validating the effectiveness with a specific case study.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Peter M. Powers, Sanaz Rezaeian, Allison M. Shumway, Mark D. Petersen, Nicolas Luco, Oliver S. Boyd, Morgan P. Moschetti, Arthur D. Frankel, Eric M. Thompson
Summary: The USGS National Seismic Hazard Model is the scientific foundation of seismic design regulations in the U.S. The 2018 update includes significant changes to ground motion models to meet new multi-period response spectra requirements. Local seismic velocity models were used to more accurately estimate ground motions in the Western United States.
EARTHQUAKE SPECTRA
(2021)
Article
Engineering, Geological
I. Mosca, S. Sargeant, B. Baptie, R. M. W. Musson, T. C. Pharaoh
Summary: This article presents updated seismic hazard maps for the UK, intended for use with the revised edition of Eurocode 8. The new maps incorporate an up-to-date earthquake catalogue for the British Isles, a modified source model, and advances in ground motion modelling. They provide hazard information for peak ground acceleration and spectral acceleration at different periods, considering various return periods.
BULLETIN OF EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Civil
Sanaz Rezaeian, Peter M. Powers, Allison M. Shumway, Mark D. Petersen, Nicolas Luco, Arthur D. Frankel, Morgan P. Moschetti, Eric M. Thompson, Daniel E. McNamara
Summary: The USGS National Seismic Hazard Model (NSHM) is regularly updated to consider the best available science and data, with the 2018 update focusing on major changes to ground motion models, especially in the central and eastern United States (CEUS). The update reflects new multi-period response spectra requirements in seismic design regulations and includes new GMMs specific to the CEUS region.
EARTHQUAKE SPECTRA
(2021)
Article
Forestry
Todd West, John Sessions, Bogdan M. Strimbu
Summary: This study analyzed the cost and productivity of steep slope harvesting systems and proposed a predictive model that can cover a wider range of slopes and tree sizes, providing a foundation for future research.
Article
Geosciences, Multidisciplinary
G. Surve, Jyotima Kanaujia, Nitin Sharma
Summary: This study aimed to understand and assess the seismic hazard of Mumbai using probabilistic seismic hazard analysis. Results showed that Mumbai has low seismic hazard compared to previous studies.
Article
Multidisciplinary Sciences
Igor B. Movchan, Alexandra A. Yakovleva, Vladimir Frid, Alexander B. Movchan, Zilya I. Shaygallyamova
Summary: A new approach to seismic analysis is introduced and demonstrated for recent seismic events in the Blackpool region of the UK. The analysis is based on the study of elastic fields, three-dimensional extrapolations of the landscape, and the reconstruction of a three-dimensional digital model of seismic map boundaries and vertical profiles. The approach is verified by comparing it with published data and conducting spectral analysis of identified regions of seismic activity.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)