Results 71 to 80 of about 6,295 (213)

An unexplained tsunami: Was there megathrust slip during the 2020 Mw7.6 Sand Point, Alaska, earthquake?

Seismica
On October 19, 2020, the Mw7.6 Sand Point earthquake struck south of the Shumagin Islands in Alaska. Moment tensors indicate the earthquake was primarily strike-slip, yet the event produced an enigmatic tsunami that was larger and more widespread than ...
Sean Santellanes, Dara Goldberg, Pablo Koch, Diego Melgar, William Yeck, Brendan Crowell, Jiun-Ting Lin   +6 more
doaj   +1 more source

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 25 October 2010 Mentawai tsunami earthquake (M_w 7.8) and the tsunami hazard presented by shallow megathrust ruptures [PDF]

, 2011
The 25 October 2010 Mentawai, Indonesia earthquake (M_w 7.8) ruptured the shallow portion of the subduction zone seaward of the Mentawai islands, off-shore of Sumatra, generating 3 to 9 m tsunami run-up along southwestern coasts of the Pagai Islands that
Ammon, C. J., Cheung, K. F., Hutko, A. R., Kanamori, H., Lay, T., Yamazaki, Y.   +5 more
core   +1 more source

Rupture characteristics of major and great (M_w  ≥ 7.0) megathrust earthquakes from 1990 to 2015: 1. Source parameter scaling relationships [PDF]

, 2016
Source parameter scaling for major and great thrust-faulting events on circum-Pacific megathrusts is examined using uniformly processed finite-fault inversions and radiated energy estimates for 114 M_w ≥ 7.0 earthquakes. To address the limited resolution
Kanamori, Hiroo, Lay, Thorne, Rivera, Luis, Ye, Lingling   +3 more
core   +3 more sources

Partial Ruptures, Cascading Multi‐Fault Ruptures, and Aftershocks in 2D Random Fault Network

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract The Gutenberg‐Richter law for the distribution of earthquake magnitude and the Omori law for the decay of aftershocks are two universal laws in seismicity. Although numerical models have been developed to reproduce these laws, they sometimes produce many more foreshocks and fewer aftershocks than observed.
So Ozawa
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

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

Uplift and subsidence associated with the great Aceh-Andaman earthquake of 2004 [PDF]

, 2006
Rupture of the Sunda megathrust on 26 December 2004 produced broad regions of uplift and subsidence. We define the pivot line separating these regions as a first step in defining the lateral extent and the downdip limit of rupture during that great M_w ≈
Abrams, Michael, Agnew, Duncan C., Avouac, Jean-Philippe, Hudnut, Kenneth W., Meltzner, Aron J., Natawidjaja, Danny H., Sieh, Kerry   +6 more
core   +1 more source

19 Clustered Foreshock Sequences Along the San Jacinto Fault Zone: Possible Role of Frictional Heterogeneity in Extended Earthquake Nucleation

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Laboratory experiments and theoretical models suggest that earthquakes are preceded by extended nucleation phases, perhaps by slow but accelerating slip. However, such nucleation phases are hard to observe before natural earthquakes. Here we identify clustered foreshock sequences that could be nucleation signatures.
Hui Huang, Jessica C. Hawthorne
wiley   +1 more source