Results 21 to 30 of about 89 (88)

Geological and Historical‐Based Approaches to Define Scenario Earthquake: Case‐Studies and Application at Municipality‐Scale in Italy

Earthquake Engineering &Structural Dynamics, Volume 54, Issue 15, Page 3828-3845, December 2025.
ABSTRACT This study compares two approaches for determining earthquake magnitude (M) and source‐to‐site distance (R) to assess seismic scenarios in Italy. The first method relies on geological criteria from the Italian seismogenic sources database (DISS3.3.0), while the second method uses historical earthquakes from the DBMI‐CPTI15 Italian catalogue ...
Sgobba Sara, Minotti Elisa, Freddi Marta, Luzi Lucia   +3 more
wiley   +1 more source

Uncertainty in Ground-Motion-to-Intensity Conversions Significantly Affects Earthquake Early Warning Alert Regions

The Seismic Record
We examine how the choice of ground-motion-to-intensity conversion equations (GMICEs) in earthquake early warning (EEW) systems affects resulting alert regions. We find that existing GMICEs can underestimate observed shaking at short rupture distances or
Jessie K. Saunders, Annemarie S. Baltay, Sarah E. Minson, Maren Böse   +3 more
doaj   +1 more source

Observational Seismic Fragility Models for Unreinforced Masonry Buildings Based on Building‐by‐Building Damage Data From the 2012 Emilia Earthquakes

Earthquake Engineering &Structural Dynamics, Volume 54, Issue 11, Page 2927-2946, September 2025.
ABSTRACT Over recent decades, Italy has been affected by multiple earthquakes, revealing the significant vulnerability of existing structures. These seismic events have resulted in notable human and economic losses, emphasising the importance of evaluating the impact of one or more seismic events on various building types.
Chiara Monteferrante, Gianluca Salamida, Claudio Mazzotti, Nicola Buratti   +3 more
wiley   +1 more source

Did They Feel It? Legacy Macroseismic Data Illuminates an Engimatic 20th Century Earthquake

Earth and Space Science, Volume 12, Issue 9, September 2025.
Abstract The challenges and the importance of preserving legacy instrumental records of earthquakes are now well‐recognized (e.g., Richards & Hellweg, 2020, https://doi.org/10.1785/0220200053). Seismologists may not be aware of parallel challenges and opportunities with legacy macroseismic data for earthquakes in the United States. For much of the 20th
Susan E. Hough, Lori Dengler, Robert McPherson, Lijam Hagos, Margaret Hellweg   +4 more
wiley   +1 more source

An open‐access simulated earthquake ground‐motion database for an M7 Hayward Fault earthquake in the San Francisco Bay Region

Earthquake Spectra, Volume 41, Issue 3, Page 2560-2597, August 2025.
Comprehensive understanding of earthquake ground motions, particularly in the near‐fault region of large‐magnitude events, is limited by gaps in strong‐motion data. This challenge is prominent in areas with high seismic hazard but infrequent large earthquakes where data is sparse and difficult to interpret.
David McCallen, Arben Pitarka, Houjun Tang, Rie Nakata, Khalid M Mosalam, Floriana Petrone, Selim Günay, Claudio Perez   +7 more
wiley   +1 more source

Shallow Fault Zone Structure Affects Rupture Dynamics and Ground Motions of the 2019 Ridgecrest Sequence to Regional Distances

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.
Abstract Seismic faults are surrounded by damaged rocks with reduced rigidity and enhanced attenuation. These damaged fault zone structures can amplify seismic waves and affect earthquake dynamics, yet they are typically omitted in physics‐based regional ground motion simulations.
Nico Schliwa, Alice‐Agnes Gabriel, Yehuda Ben‐Zion   +2 more
wiley   +1 more source

Slow Rupture, Long Rise Times, and Multi‐Fault Geometry: The 2020 M6.4 Southwestern Puerto Rico Mainshock

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract The M6.4 mainshock of the southwestern Puerto Rico seismic sequence on 7 January 2020, was one of the most impactful modern earthquakes in the northeastern Caribbean. Due to its offshore location and complex aftershock distribution, its source kinematics remain poorly constrained.
M. M. Solares‐Colón, D. E. Goldberg, D. Melgar, E. A. Vanacore, V. J. Sahakian, W. L. Yeck, F. Hernández, A. M. López‐Venegas   +7 more
wiley   +1 more source

Regional Back‐Analysis of Earthquake Triggered Landslide Inventories: A 2D Method for Estimating Rock Strength From Remote Sensing Data

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 1, January 2025.
Abstract Landslides occur where the stresses below the surface exceed the shear strength of the material. Landslide inventories thus offer opportunities to investigate patterns in subsurface strength provided that the stress conditions at failure can be estimated. Clues to the failure stresses are encoded in the inclination of the slope that failed and
William G. Medwedeff, Marin K. Clark, Dimitrios Zekkos   +2 more
wiley   +1 more source

Accounting for ground‐motion uncertainty in empirical seismic fragility modeling

Earthquake Spectra, Volume 40, Issue 4, Page 2456-2474, November 2024.
Seismic fragility models provide a probabilistic relation between ground‐motion intensity and damage, making them a crucial component of many regional risk assessments. Estimating such models from damage data gathered after past earthquakes is challenging because of uncertainty in the ground‐motion intensity the structures were subjected to.
Lukas Bodenmann, Jack W Baker, Božidar Stojadinović   +2 more
wiley   +1 more source

The 2023 Alaska National Seismic Hazard Model

Earthquake Spectra, Volume 40, Issue 4, Page 2545-2597, November 2024.
US Geological Survey (USGS) National Seismic Hazard Models (NSHMs) are used extensively for seismic design regulations in the United States and earthquake scenario development, as well as risk assessment and mitigation for both buildings and infrastructure.
Peter M Powers, Jason M Altekruse, Andrea L Llenos, Andy J Michael, Kirstie L Haynie, Peter J Haeussler, Adrian M Bender, Sanaz Rezaeian, Morgan P Moschetti, James A Smith, Richard W Briggs, Robert C Witter, Charles S Mueller, Yuehua Zeng, Demi L Girot, Julie A Herrick, Allison M Shumway, Mark D Petersen   +17 more
wiley   +1 more source