Results 71 to 80 of about 5,765 (201)

The Role of Fluids in Fault Mechanics: A 16‐Year Analysis of the Irpinia Seismicity (Southern Italy)

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Fluids in the crust influence earthquake nucleation by affecting fault strength and rupture dynamics, but direct observations at seismogenic depths are rare. We study the Irpinia Fault System in Southern Italy, site of the 1980 M 6.9 earthquake, to understand how fluid overpressure, fault orientation, and regional stress control earthquake ...
G. M. Adinolfi, F. Guiñez‐Rivas, J. Campos, R. De Matteis   +3 more
wiley   +1 more source

Oxygen foreshock of Mars

Planetary and Space Science, 2015
AbstractMars Express (MEX) has operated for more than 10 years in the environment of Mars, providing solar wind ion observations from the Analyzer of Space Plasmas and Energetic Atoms experiment's Ion Mass Analyser (IMA). On 21 September 2008, MEX/IMA detected foreshock-like discrete distributions of oxygen ions at around 1keV in the solar wind ...
Yamauchi, M., Lundin, R., Frahm, R.A., Sauvaud, J.-A., Holmström, M., Barabash, S.   +5 more
openaire   +1 more source

Magnetic Signatures of a Plasma Wake Behind the Swarm Satellites

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract This study provides first observational evidence of a plasma wake behind ESA's Swarm satellites, manifesting itself by a brief magnetic field strength spike and bipolar field variations in transverse direction. These magnetic signatures occur only near the dip‐equator where the magnetic declination is close to zero.
Chao Xiong, Xinyi Rang, Hermann Lühr, Fan Yin   +3 more
wiley   +1 more source

Nonlinear Waves in the Terrestrial Quasiparallel Foreshock [PDF]

Physical Review Letters, 2016
We study the applicability of the derivative nonlinear Schr dinger (DNLS) equation, for the evolution of high frequency nonlinear waves, observed at the foreshock region of the terrestrial quasi-parallel bow shock. The use of a pseudo-potential is elucidated and, in particular, the importance of canonical representation in the correct interpretation ...
Hnat, B., Kolotkov, D. Y., O'Connell, D., Nakariakov, V. M., Rowlands, G.   +4 more
openaire   +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

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

Simultaneous observations of MHD hot flow anomaly and kinetic foreshock bubble and their impacts

Frontiers in Physics
Hot flow anomalies (HFAs) and foreshock bubbles (FBs) are two types of transient phenomena characterized by flow deflected and hot cores bounded by one or two compressional boundaries in the foreshock.
Xi Lu, Xi Lu, Terry Liu, Xingran Chen, Antonius Otto, Hui Zhang   +5 more
doaj   +1 more source

The Slip Distributions of the 1952 and 2025 Kamchatka Earthquakes From Tsunami Waveforms Recorded Around the Pacific Ocean

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract The July 2025 Kamchatka earthquake (Mw 8.8) generated Pacific‐wide tsunamis. Inversion of 40 DART bottom pressure records revealed a large (∼9 m) slip at 200–400 km southwest of the epicenter. This model reproduces the local geodetic data, and is similar to other finite fault models based on teleseismic and geodetic data. Inversion of the tide
Yushiro Fujii, Kenji Satake
wiley   +1 more source

Physical mechanisms of earthquake nucleation and foreshocks: Cascade triggering, aseismic slip, or fluid flows?

Earthquake Research Advances
Earthquakes are caused by the rapid slip along seismogenic faults. Whether large or small, there is inevitably a certain nucleation process involved before the dynamic rupture.
Zhigang Peng, Xinglin Lei
doaj   +1 more source

Statistical behavior of foreshock Langmuir waves observed by the Cluster wideband data plasma wave receiver [PDF]

Annales Geophysicae, 2004
We present the statistics of Langmuir wave amplitudes in the Earth's foreshock using Cluster Wideband Data (WBD) Plasma Wave Receiver electric field waveforms from spacecraft 2, 3 and 4 on 26 March 2002.
K. Sigsbee, C. A. Kletzing, D. A. Gurnett, J. S. Pickett, A. Balogh, E. Lucek   +5 more
doaj   +1 more source