Results 81 to 90 of about 5,765 (201)

Hydraulic Control of the Foreshocks and Mainshock of the 2017 Valparaíso, Chile, Earthquake

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Slow‐slip events (SSE) are a key mode of aseismic deformation and can enhance fault permeability through fracturing, enabling fluid migration from the overpressured oceanic crust to the plate interface. Whether the resulting poroelastic stress changes promote seismicity and larger megathrust events, however, remains unclear.
Carlos Peña, Leoncio Cabrera, Jesús Muñoz‐Montecinos, Sergio Ruiz, Oliver Heidbach   +4 more
wiley   +1 more source

Influence of the Eccentric Geomagnetic Dipole on Longitude Variations of Compressional Upstream Wave Amplitudes in the Topside Ionosphere: Results From the MSS‐1A Satellite

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Based on 2‐year magnetic data from the Macau science satellite, we investigate the compressional Pc3‐4 pulsations (between 16 and 100 mHz) driven by upstream waves (UWs). Our results confirm larger UWs amplitudes in the South Atlantic Anomaly (SAA) longitudes, agreeing with previous missions.
Chao Xiong, Haibin Liu, Hermann Lühr, Chunyu Xu   +3 more
wiley   +1 more source

Variation of proton flux profiles with the observer's latitude in simulated gradual SEP events

, 2013
We study the variation of the shape of the proton intensity-time profiles in simulated gradual Solar Energetic Particle (SEP) events with the relative observer's position in space with respect to the main direction of propagation of an interplanetary (IP)
Aran, A., Jacobs, C., Poedts, S., Rodríguez-Gasén, R., Sanahuja, B.   +4 more
core   +4 more sources

Mainshock‐Induced Stress Changes Modulate Initial Aftershocks on Complex Branching Faults of the 2019 Ridgecrest Earthquake

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Large earthquakes can activate complex aftershock fault networks. In such systems, what controls the spatiotemporal evolution of early aftershocks remains a critical yet unresolved problem. Here, using the 2019 M 7.1 Ridgecrest earthquake as an example, we partition the first 10 days of aftershocks onto 15 branching faults activated by the ...
Yanlan Hu, Xin Cui, Zefeng Li
wiley   +1 more source

Crustal Heat Flow Drives the Earthquake Magnitude Distribution

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Earthquake magnitude‐frequency distributions exhibit significant space‐time variations, which can provide critical insights into the physical processes driving seismicity. Understanding these variations is crucial for assessing seismic hazards and uncovering the physical processes driving earthquakes.
P. Corrado, M. Taroni, L. Cordrie, R. Basili, W. Marzocchi, J. Selva   +5 more
wiley   +1 more source

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

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract 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. Our results reveal a southwestward migration of foreshocks toward the mainshock epicenter through multiple stages, with a migration speed of ∼7.0 km ...
Ji Zhang, Aitaro Kato, Wei Wang, Miao Zhang   +3 more
wiley   +1 more source

The Evolution of Hot Flow Anomalies in Martian Space Environment

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract Hot Flow Anomalies (HFAs) are transient foreshock structures generated by solar wind discontinuity‐bow shock interactions, with their evolution only confirmed near Earth. Using MAVEN and Tianwen‐1 joint observations, we study the evolution of a Martian HFA event detected on 17 September 2022 (dayside by MAVEN, nightside by Tianwen‐1).
Heying Wang, Mingyu Wu, Yangjun Chen, Qi Lv, Guoqiang Wang, Sudong Xiao, Peng E, Aimin Du, Ding Yuan, Tielong Zhang   +9 more
wiley   +1 more source

维西—乔后断裂带及其周边地区震群和前震序列活动特征

Dizhen xuebao
使用云南地震台网2009—2021年的地震目录和波形数据，采用双差定位方法、基于P波初动极性和S/P振幅比的HASH方法和最大似然法等，获取了维西—乔后断裂带及附近地区ML≥4.0震群和前震序列精确的震源位置、震源机制解、视应力和b值等地震活动参数，对比分析了维西—乔后断裂带及其周边震群及前震序列的活动特征。结果显示：除前震序列频次呈现出反大森定律外，前震序列与普通震群在空间分布、震源机制一致性、视应力和b值等单一参数方面并无明显的差异；但前震序列同时具备震中优势分布方向与区域主要构造展布方向一致 ...
Guangming Wang, Xin Ouyang, Zifeng Liu, Guanling Peng, Jinzhong Jiang   +4 more
doaj   +1 more source

On the Importance of Spatial and Velocity Resolution in the Hybrid-Vlasov Modeling of Collisionless Shocks

Frontiers in Physics, 2018
In hybrid-Vlasov plasma modeling, the ion velocity distribution function is propagated using the Vlasov equation while electrons are considered a charge-neutralizing fluid. It is an alternative to particle-in-cell methods, one advantage being the absence
Yann Pfau-Kempf, Markus Battarbee, Urs Ganse, Sanni Hoilijoki, Sanni Hoilijoki, Lucile Turc, Sebastian von Alfthan, Rami Vainio, Minna Palmroth, Minna Palmroth   +9 more
doaj   +1 more source

Statistical study of magnetic holes in the upstream region of Mercury’s bow shock

Earth and Planetary Physics
Magnetic holes are magnetic depression structures that exist widely in many plasma environments. The magnetic holes with durations of >1 s in the solar wind at Mercury’s orbit have drawn much attention, but the properties of the magnetic holes with ...
GuoQiang Wang, SuDong Xiao, MingYu Wu, YuanQiang Chen, TieLong Zhang   +4 more
doaj   +1 more source