Results 61 to 70 of about 6,894 (231)

Foreshock Migration Preceding the 2025 Mw 8.8 Kamchatka Earthquake: Insights From Single‐Station Observations

Geophysical Research Letters
We investigate the spatiotemporal evolution of foreshocks preceding the 2025 Mw 8.8 Kamchatka earthquake by applying single‐station analysis to waveforms recorded at the nearest seismic station.
Ji Zhang, A. Kato, Wei Wang, Miao Zhang
semanticscholar   +1 more source

Feasibility of a National Earthquake Early Warning System for New Zealand: The Propagation of Local Undamped Motion Algorithm Evaluated on a Physics‐Based Synthetic Earthquake Catalogue

New Zealand Journal of Geology and Geophysics, Volume 69, Issue 4, December 2026.
Earthquake early warning (EEW) can reduce injuries and damage by issuing alerts before incoming shaking. We evaluate the Propagation of Local Undamped Motion (PLUM) algorithm as a candidate for a national EEW system for Aotearoa New Zealand (NZ). We develop and demonstrate a novel methodology for evaluating EEW performance under a wide range of future ...
Rasika Nandana, Caroline Holden, Martha Savage, Peter Andreae   +3 more
wiley   +1 more source

Alfvén waves in the foreshock propagating upstream in the plasma rest frame: statistics from Cluster observations [PDF]

, 2004
International audienceWe statistically study various properties of low-frequency waves such as frequencies, wave numbers, phase velocities, and polarization in the plasma rest frame in the terrestrial foreshock.
Narita, Y., Fränz, M., Richter, Ingo, Glassmeier, Karl-Heinz, Rème, H., Schäfer, S., Korth, A., Fornaçon, K.-H., Georgescu, E., Dandouras, I., Motschmann, U.   +10 more
core   +4 more sources

Statistical Evaluation of a Foreshock Transient Model Using Ground‐Based ULF Wave Observations

Geophysical Research Letters
Hot flow anomalies and foreshock bubbles are discontinuity–driven foreshock transients that generate significant geospace disturbances. A recently developed analytical model can predict their upstream perturbations.
Terry Zixu Liu, Vassilis Angelopoulos, Hui Zhang, Ying‐Dong Jia, Siqi Zhao   +4 more
doaj   +1 more source

Three‐Dimensional Resistivity Imaging Constrains Crustal Heterogeneity Beneath the 2010 Yushu Ms 7.1 Earthquake Rupture

Geophysical Research Letters, Volume 53, Issue 21, 16 November 2026.
Abstract The 2010 Yushu (eastern Tibetan Plateau) Ms 7.1 strike‐slip earthquake ruptured unilaterally toward the southeast but left a hypocentral segment without mapped surface rupture, followed by a two‐stage reorganization of aftershocks. We present a 3‐D electrical resistivity model from 70 quality‐controlled magnetotelluric sites acquired shortly ...
Yan Deng, Ji Tang, Xiaobin Chen, Zeyi Dong, Shuai Ruan, Bing Han, Junmeng Zhao, Qiang Xu, Yuhan Xiong, Heng Zhang   +9 more
wiley   +1 more source

Fluid‐Controlled Tidal Modulation of Aftershocks Following the 2022 M6.8 Luding Earthquake

Geophysical Research Letters, Volume 53, Issue 21, 16 November 2026.
Abstract Aftershock sequences record how fault zones recover and weaken after earthquakes, but the roles of fluid migration and stress heterogeneity remain difficult to isolate. Earth tides impose predictable stress perturbations and thus provide a natural probe of faults near failure, although their signals are often obscured by aftershock clustering.
Jinbo Zheng, Wei Wang, Aitaro Kato, Jinhai Zhang   +3 more
wiley   +1 more source

Properties and formation mechanisms of foreshock transients [PDF]

, 2022
Dissertation (Ph.D.) University of Alaska Fairbanks, 2022Interactions between bow shock-reflected (foreshock) ions with solar wind particles can lead to the formation of foreshock transients, frequently observed upstream of the bow shock.
Vu, Andrew
core  

A model of foreshock occurrence [PDF]

Geophysical Journal International, 1989
SUMMARY We have constructed a model for the occurrence of foreshocks and foreshock sequences. The foreshocks as well as the main shock are assumed to occur because of the abrupt coalescence of pre-existing cracks. Coalescence occurs if the stress intensity factors at the crack tips exceed a certain critical value.
T. Yamashita, L. Knopoff
openaire   +1 more source

Suprathermal Electron Acceleration Comparison of the Venusian and Terrestrial Bow Shocks

Journal of Geophysical Research: Space Physics, Volume 131, Issue 11, November 2026.
Abstract We study suprathermal electron acceleration at the Venusian bow shock using the Parker Solar Probe gravity assists and the Venus Express spacecraft mission. The acceleration is classified by measuring the maximum energy and the power‐law spectral slope (index) of the electron phase space density immediately downstream of the shocks for ...
M. Lindberg, H. Hietala, S. Nyberg, Y. Futaana, H. George   +4 more
wiley   +1 more source

Propagation of Ultralow‐Frequency Waves from the Ion Foreshock into the Magnetosphere During the Passage of a Magnetic Cloud

Journal of Geophysical Research - Space Physics, 2021
We have examined the properties of ultralow‐frequency (ULF) waves in space (the ion foreshock, magnetosheath, and magnetosphere) and at dayside magnetometer stations (L = 1.6–6.5) during Earth's encounter with a magnetic cloud in the solar wind, which is
Kazue Takahashi, L. Turc, E. Kilpua, N. Takahashi, A. Dimmock, P. Kajdič, M. Palmroth, Y. Pfau‐Kempf, J. Souček, T. Motoba, M. Hartinger, A. Artemyev, H. Singer, U. Ganse, M. Battarbee   +14 more
semanticscholar   +1 more source