Results 11 to 20 of about 5,647 (190)

Pervasive Foreshock Activity Across Southern California [PDF]

Geophysical Research Letters, 2019
Foreshocks have been documented as preceding less than half of all mainshock earthquakes. These observations are difficult to reconcile with laboratory earthquake experiments and theoretical models of earthquake nucleation, which both suggest that ...
Daniel T. Trugman, Zachary E. Ross
doaj   +8 more sources

Mainshocks are aftershocks of conditional foreshocks: How do foreshock statistical properties emerge from aftershock laws [PDF]

Journal of Geophysical Research: Solid Earth, 2003
The inverse Omori law for foreshocks discovered in the 1970s states that the rate of earthquakes prior to a mainshock increases on average as a power law ~ 1/(t_c-t)^p' of the time to the mainshock occurring at t_c.
Abercrombie, Agnew, Agnès Helmstetter, Aki, Berg, Bowman, Bufe, Cagnetti, Console, Davis, Didier Sornette, Dodge, Enescu, Felzer, Gabrielov, Gabrielov, Gross, Guo, Hainzl, Helmstetter, Helmstetter, Huang, Ikegami, Imoto, Jaumé, Jean-Robert Grasso, Jones, Jones, Kagan, Kagan, Kagan, Kagan, Kagan, Keilis-Borok, Keilis-Borok, Keilis-Borok, Kisslinger, Kisslinger, Knopoff, Li, Lindh, Ma, Maeda, Michael, Mogi, Mogi, Molchan, Molchan, Molchan, Molchan, Narteau, Ogata, Ogata, Ogata, Omori, Omori, Page, Papazachos, Papazachos, Papazachos, Papazachos, Pelletier, Reasenberg, Reasenberg, Reasenberg, Rotwain, Sammis, Scholz, Shaw, Smith, Smith, Sornette, Sornette, Sornette, Sornette, Stephens, Suyehiro, Tajima, Utsu, von Seggern, Wu, Wyss, Yamanaka, Yamashina, Yamashita, Yamashita, Yamashita, Zhang, Zöller   +88 more
core   +9 more sources

Observations of a new foreshock region upstream of a foreshock bubble's shock [PDF]

Geophysical Research Letters, 2016
Earth's foreshock is a region within the solar wind upstream of Earth's bow shock filled with backstreaming solar wind particles reflected at the shock.
Terry Z. Liu, Heli Hietala, Vassilis Angelopoulos, Drew L. Turner   +3 more
doaj   +2 more sources

Traveling Foreshocks and Transient Foreshock Phenomena [PDF]

Journal of Geophysical Research: Space Physics, 2017
AbstractWe use the multispacecraft capabilities of the Cluster and Time History of Events and Macroscale Interactions during Substorms (THEMIS) missions to show that two types of foreshock may be detected in spacecraft data. One is the global foreshock that appears upstream of the Earth's quasi‐parallel bow shock under steady or variable interplanetary
P. Kajdič, X. Blanco‐Cano, N. Omidi, D. Rojas‐Castillo, D. G. Sibeck, L. Billingham   +5 more
openaire   +3 more sources

Compound electron acceleration at planetary foreshocks. [PDF]

Nat Commun
AbstractShock waves, the interface of supersonic and subsonic plasma flows, are the primary region for charged particle acceleration in multiple space plasma systems, including Earth’s bow shock, which is readily accessible for in-situ measurements. Spacecraft frequently observe relativistic electron populations within this region, characterized by ...
Shi X, Artemyev A, Angelopoulos V, Liu T, Wilson Iii LB.   +4 more
europepmc   +6 more sources

Precedent-extrapolation estimate of the seismic hazard in the Sakhalin and the Southern Kurils region [PDF]

Геосистемы переходных зон, 2021
The paper describes the algorithm and the results of the seismic hazard estimate in the Sakhalin and Southern Kurils region based on the data of the Japan Regional Catalogue (JMA).
Alexander I. Malyshev, Lidiia K. Malysheva   +1 more
doaj   +1 more source

Cluster-based foreshock discrimination model with flexible time horizon and mainshock magnitudes

Progress in Earth and Planetary Science, 2023
Foreshock detection before mainshock occurrence is an important challenge limiting the short-term forecasts of large earthquakes. Various models for predicting mainshocks based on discrimination of foreshocks activity have been proposed, but many of them
Shunichi Nomura, Yosihiko Ogata
doaj   +1 more source

A global view of Pc3 wave activity in near-Earth space: Results from hybrid-Vlasov simulations

Frontiers in Astronomy and Space Sciences, 2022
Ultra-low frequency (ULF) waves in the Pc3 range, with periods between 10–45 s, are routinely observed in Earth’s dayside magnetosphere. They are thought to originate in the foreshock, which extends upstream of the quasi-parallel bow shock and is ...
Lucile Turc, Hongyang Zhou, Vertti Tarvus, Matti Ala-Lahti, Matti Ala-Lahti, Markus Battarbee, Yann Pfau-Kempf, Andreas Johlander, Urs Ganse, Maxime Dubart, Harriet George, Maxime Grandin, Konstantinos Horaites, Fasil Tesema, Jonas Suni, Markku Alho, Konstantinos Papadakis, Minna Palmroth, Minna Palmroth   +18 more
doaj   +1 more source

The ULF wave foreshock boundary: Cluster observations [PDF]

, 2015
The interaction of backstreaming ions with the incoming solar wind in the upstream region of the bow shock gives rise to a number of plasma instabilities from which ultra-low frequency (ULF) waves can grow.
Andres, Nahuel, Bertucci, Cesar, Gomez, Daniel, Mazelle, Christian, Meziane, Karim   +4 more
core   +2 more sources

Statistical study of foreshock cavitons [PDF]

Annales Geophysicae, 2013
In this work we perform a statistical analysis of 92 foreshock cavitons observed with the Cluster spacecraft 1 during the period 2001–2006. We analyze time intervals during which the spacecraft was located in the Earth's foreshock with durations ...
P. Kajdič, X. Blanco-Cano, N. Omidi, K. Meziane, C. T. Russell, J.-A. Sauvaud, I. Dandouras, B. Lavraud   +7 more
doaj   +1 more source