Results 71 to 80 of about 1,235 (207)

Importance of forearc topography for the triggering of aftershocks of megathrust earthquakes: insights from mechanical models and the Tohoku-Oki and Maule earthquakes [PDF]

Solid Earth
Aftershocks of megathrust earthquakes at subduction zones may be driven by stresses arising from the topography of the forearc. However, the effect of topographic stresses on aftershock triggering is quantitatively not well understood and has been ...
A. Dielforder, A. Dielforder, G. M. Bocchini, A. Hampel   +3 more
doaj   +1 more source

The 2025 Mw 7.6 Aomori‐Oki Megathrust Sequence and a Slip‐Parallel Seismic Belt to the Trench

Geophysical Research Letters, Volume 53, Issue 11, 16 June 2026.
Abstract The 2025 Mw 7.6 Aomori‐Oki earthquake nucleated near the 1968 Mw 8.3 Tokachi‐Oki rupture area. Our waveform inversion reveals large slip (>1 m) extending ∼40 km northward from the hypocenter, overlapping the inferred 1968 northern asperity. Minor secondary slip (0.2–0.6 m) was resolved ∼60 km updip, and high‐precision relocations show that ...
Keisuke Yoshida, Masaoki Uno, Dan Bassett   +2 more
wiley   +1 more source

Impact of Upper‐Plate Faulting on Megathrust Foreshocks: Insights From the 2014 Iquique Earthquake

Geophysical Research Letters
The role of upper‐plate faulting in the seismic cycle of large megathrust earthquakes remains poorly understood. We use quasi‐dynamic numerical simulations of seismic cycles to analyze the interaction between crustal faulting and the foreshock sequence ...
J. Julve, M. Moreno, S. Barbot, A. Tassara   +3 more
doaj   +1 more source

Identifying the Greatest Earthquakes of the Past 2000 Years at the Nehalem River Estuary, Northern Oregon Coast, USA

Open Quaternary, 2020
We infer a history of three great megathrust earthquakes during the past 2000 years at the Nehalem River estuary based on the lateral extent of sharp (≤3 mm) peat-mud stratigraphic contacts in cores and outcrops, coseismic subsidence as interpreted from ...
Alan R. Nelson, Andrea D. Hawkes, Yuki Sawai, Simon E. Engelhart, Rob Witter, Wendy C. Grant-Walter, Lee-Ann Bradley, Tina Dura, Niamh Cahill, Ben Horton   +9 more
doaj   +1 more source

Evolution of Pore Fluid Pressure in an Accretionary Outer Wedge Over Megathrust Earthquake Cycles: The Northern Cascadia Example

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 2, June 2026.
The evolution of pore fluid pressure ( Pf$P_{\mathrm{f}}$) in the most seaward portion of a subduction accretionary prism plays an essential role in the cycle of tsunamigenic earthquakes. Based on recent geophysical observations, here we propose a testable conceptual model for this evolution for northern Cascadia offshore of Washington.
Tianhaozhe Sun, Kelin Wang
wiley   +1 more source

Variability of megathrust earthquakes in the world revealed by the 2011 Tohoku-oki Earthquake [PDF]

Earth, Planets and Space, 2012
The seismicity of the Pacific coast of Tohoku, Japan, has been investigated in detail and characterized into regional seismic segments. The 2011 megathrust earthquake of Mw 9.0 on 11 March ruptured almost all of the segments in that area, causing devastating tsunamis. The prime factor that had not been recognized before is the double segmentation along
Koyama, Junji, Yoshizawa, Kazunori, Yomogida, Kiyoshi, Tsuzuki, Motohiro   +3 more
openaire   +2 more sources

Evaluation of the Potential Geological and Socioeconomic Impacts of the Imminent Cascadia Megathrust Earthquake

, 2020
The Cascadia Subduction Zone on the northwest coast of the United States poses the threat of a devastating megathrust earthquake and subsequent tsunami damaging coastal populations.
Pritchard, Matthew
core   +1 more source

Variations in Forearc Stress and Changes in Principle Stress Orientations Caused by the 2004–2005 Megathrust Earthquakes in Sumatra, Indonesia

Frontiers in Earth Science, 2021
Coseismic changes in principal stress orientation in the northern Sumatra subduction zone due to two giant megathrust earthquakes there in 2004 and 2005 are estimated to investigate the in-situ stress.
Muhammad Taufiq Rafie, Phil R. Cummins, Phil R. Cummins, David P. Sahara, Sri Widiyantoro, Sri Widiyantoro, Wahyu Triyoso, Andri Dian Nugraha   +7 more
doaj   +1 more source

Metamorphic Dehydration, Fluid Pressure, and the Frictional‐Viscous Transition Along Subduction Megathrusts: Case Study in Cascadia and Implications for Slow Earthquakes

AGU Advances, Volume 7, Issue 3, June 2026.
Abstract Relative plate motion in subduction zones transitions from frictional slip to viscous flow with increasing depth and temperature. The frictional‐viscous transition can control the depth extent of megathrust earthquakes and episodic tremor and slip (ETS).
So Ozawa, Eric M. Dunham, Cailey B. Condit   +2 more
wiley   +1 more source

Interseismic Coupling Along the Java‐Timor Subduction‐Collision Zone at East Indonesia

Geophysical Research Letters
The Java‐Timor subduction‐collision zone is one of the most tectonically complicated structures along the strike of the Indonesia‐Australia convergence. This complexity makes it difficult to interpret observations of interseismic deformation.
Siyuan Zhao, Phil R. Cummins, Simon McClusky, Meghan S. Miller   +3 more
doaj   +1 more source