Results 71 to 80 of about 6,894 (231)

Van Allen Probes Observations of a Fundamental Poloidal Wave in the Plasmasphere

Journal of Geophysical Research: Space Physics, Volume 131, Issue 11, November 2026.
Abstract All past spacecraft observations of fundamental poloidal Alfvén (P1) waves attributed to ion drift resonance have been made outside the plasmasphere. In this study, we present the first spacecraft observations of a plasmaspheric P1 wave driven by that resonance.
Kazue Takahashi, Tomotsugu Yamakawa, Matina Gkioulidou, D. G. Mitchell, Jerry W. Manweiler   +4 more
wiley   +1 more source

Surface fault ruptures associated with the 14 April foreshock (Mj 6.5) of the 2016 Kumamoto earthquake sequence, southwest Japan [PDF]

, 2016
The 2016 Kumamoto earthquake sequence was a rare event worldwide in that the surface ruptures associated with the largest foreshock (Mj 6.5) of 21:26 (JST), 14 April ruptured again during the mainshock (Mj 7.3) of 01:25 (JST), 16 April. The 14 April Mj 6.
Takashi Nakata, Sugito, Nobuhiko, Yoshida, Haruka, Haruka Yoshida, Matsuta, Nobuhisa, Nobuhiko Sugito, Tsutsumi, Hiroyuki, Hiroyuki Tsutsumi, Kumahara, Yasuhiro, Nakata, Takashi, Yasuhiro Kumahara, Kyoko Kagohara, Hideaki Goto, Nobuhisa Matsuta, Kagohara, Kyoko, Goto, Hideaki   +15 more
core   +2 more sources

Strong foreshock signal preceding the L'Aquila (Italy) earthquake (M_w 6.3) of 6 April 2009 [PDF]

Natural Hazards and Earth System Sciences, 2010
We used the earthquake catalogue of INGV extending from 1 January 2006 to 30 June 2009 to detect significant changes before and after the 6 April 2009 L'Aquila mainshock (Mw=6.3) in the seismicity rate, r (events/day), and in b-value.
G. Minadakis, A. Fokaefs, M. Charalampakis, G. A. Papadopoulos   +3 more
doaj  

A case study of large-amplitude ULF waves in the Martian foreshock

Earth and Planetary Physics, 2020
Foreshock ultralow frequency (ULF) waves constitute a significant physical phenomenon in the plasma environment of terrestrial planets. The occurrence of these waves, associated with backstreaming particles reflected and accelerated at the bow shock ...
LiCan Shan, YaSong Ge, AiMin Du
doaj   +1 more source

The May 2024 Storm: The Cusps and Dayside Magnetopause in Simulated Soft X‐Rays

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract The coronal mass ejection (CME) arriving at Earth on 10 May 2024 caused the most intense geomagnetic storm in the last two decades, resulting in highly unusual cusp and magnetopause dynamics. We simulate soft X‐Ray emission due to solar wind charge exchange with exospheric neutrals to image the global dayside dynamics, focusing on the impact ...
J. Ng, L.‐J. Chen, B. Burkholder, D. Sibeck, F. S. Porter, K. H. Pham, V. G. Merkin, H. Connor, J. W. Bonnell, S. Petrinec, Y. Zou, B. Alterman, G. Cucho‐Padin   +12 more
wiley   +1 more source

Ion Behavior at Shocklets: A Case Study of MMS Observations

Geophysical Research Letters, 2022
The existence of shocklets, a kind of solitary structure, has been demonstrated in the Earth's foreshock regions for decades. Their formation and evolution are believed to be controlled by ions. However, the detailed behavior of ions at them has not been
Z.‐Y. Liu, Q.‐G. Zong, H. Zhang, J.‐T. Zhao, R. Rankin, C. J. Pollock, G. Le   +6 more
doaj   +1 more source

Subsurface Deformation and Recovery From the Ridgecrest Mw 7.1 Earthquake Revealed by P‐Wave Velocity Time‐Lapse Tomography

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract We investigate co‐ and post‐seismic P‐wave velocity (Vp) changes following the July 2019 Mw 7.1 Ridgecrest strike‐slip earthquake using time‐lapse tomography from 50,345 P‐wave arrivals (2011–2024). Co‐seismically, Vp changes correspond to the volumetric strain change lobes of the earthquake, increasing in compressional zones and decreasing in
Yuanlong Li, Shunping Pei, Chunmei Ren, Yifang Cheng   +3 more
wiley   +1 more source

Some characteristics of foreshocks and aftershocks of the 2022 ML6.8 Chihshang, Taiwan, earthquake sequence

Frontiers in Earth Science
Foreshocks and aftershocks occurred before and after the ML6.8 (Mw7.0) earthquake in eastern Taiwan on 18 September 2022. We explore the epicentral distribution and temporal variations for the mainshock, foreshocks, and aftershocks.
Kou-Cheng Chen, Bor-Shouh Huang, Kwang-Hee Kim, Jeen-Hwa Wang, Jeen-Hwa Wang   +4 more
doaj   +1 more source

Characteristics of Foreshock Subsolar Compressive Structures

Journal of Geophysical Research: Space Physics, 2023
Abstract The turbulent foreshock region upstream of the quasi‐parallel bow shock is dominated by waves and reflected particles that interact with each other and create a large number of different foreshock transients. The structures with the enhanced magnetic field, Short Large Amplitude Magnetic Structures, and density spikes named ...
Niki Xirogiannopoulou, Oleksandr Goncharov, Jana Safrankova, Zdenek Nemecek   +3 more
openaire   +1 more source

Modulation of Slow Slip Event Characteristics Throughout the Costa Rica Subduction Zone Earthquake Cycle

Geophysical Research Letters, Volume 53, Issue 20, 28 October 2026.
Abstract Slow slip events (SSEs) represent an aseismic transient slip mode that repeats quasi‐periodically, near or partially overlapping with the megathrust earthquake zone. However, the process of stress interaction between SSEs and earthquake zones is not clearly understood.
Luhong Lu, Yajing Liu
wiley   +1 more source