Results 71 to 80 of about 6,760 (227)

Seismogenic structure behaviour revealed by spatial clustering of seismicity in the Umbria-Marche Region (Central Italy)

Annals of Geophysics, 1998
Time variations in the spatial distribution of earthquake epicentres are analyzed by application of the fractal correlation dimension method. The zone under investigation is located in Central Italy, bounded in longitude by 12.0 and 14.4 degrees east and
P. Tosi
doaj   +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

Global Characterization of the Compressional Components of Magnetic Wave Activity in Mercury's Foreshock Region

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract Mercury's weak intrinsic magnetic field forms a small magnetosphere and thus a bow shock that decelerates the supermagnetosonic solar wind and reflects particles upstream, forming a foreshock in the quasi‐parallel region. This region is populated by backstreaming ions and electrons and associated wave activity.
Kristin Pump, Daniel Heyner, Xochitl Blanco‐Cano, Primož Kajdič, Diana Rojas‐Castillo, Tomas Karlsson, Ferdinand Plaschke   +6 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

Foreshock Cavities: Direct Transmission Through the Bow Shock

Journal of Geophysical Research - Space Physics, 2021
Global hybrid code simulations predict enhanced densities and magnetic field strengths not only in foreshock compressional boundaries on the flanks of the steady‐state dayside foreshock under near‐radial IMF conditions but also on the edges of the ...
D. Sibeck, S. Lee, N. Omidi, Vassilis Angelopoulos   +3 more
semanticscholar   +1 more source

A Magnetospheric Source for Near‐Planet Whistler‐Mode Waves at Venus

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract The presence or absence of lightning in the atmosphere of Venus has important implications for atmospheric chemistry, potential chemical signatures of life, identifying volcanic activity, and quantifying potential hazards to future exploration missions.
David M. Malaspina, Keirra D. Kernan, Katherine A. Goodrich, Yingjuan Ma, Shannon M. Curry   +4 more
wiley   +1 more source

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

A Likelihood‐Free Framework for Seismic Forecasting Models: Application to Incomplete ETAS Model via Simulation‐Based Inference

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract Recent advances in deep‐learning‐based earthquake detection have revolutionized seismology, producing high‐resolution catalogs complete down to very low magnitudes. While these data sets offer an unprecedented view of seismic triggering, their massive scale and inherent short‐term incompleteness pose a major challenge for traditional ...
P. Bountzis, G. Petrillo, E. Lippiello
wiley   +1 more source

Microscopic, Multipoint Characterization of Foreshock Bubbles With Magnetospheric Multiscale (MMS)

Journal of Geophysical Research: Space Physics, 2020
This work presents the first detailed analysis of foreshock bubbles (FBs) using high‐resolution Magnetospheric Multiscale (MMS) data. Between October 2017 and January 2019, MMS captured 10 foreshock transient events with burst resolution data that we ...
D. Turner, T. Liu, L. Wilson, Ian J. Cohen, D. Gershman, J. Fennell, J. Blake, B. Mauk, N. Omidi, J. Burch   +9 more
semanticscholar   +1 more source

Cross‐Correlations of Solar Wind Parameters Using Monitoring Spacecraft

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Space weather predictive modeling currently utilizes real‐time data from the spacecraft ACE and DSCOVR, with SOLAR‐1 and IMAP recently online. This study assesses whether DSCOVR solar wind plasma and interplanetary magnetic field (IMF) data exhibit large‐scale discrepancies from the corresponding ACE data, and if so, whether these ...
P. H. Reiff, S. Chepuri, J. Liebenthal, S. Petrinec, S. Schwartz, C. T. Russell   +5 more
wiley   +1 more source