Earth, Planets and Space
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Some new features of ionospheric plasma depletions over the Indian zone using all sky optical imaging
Earth, Planets and Space - Tập 52 - Trang 549-559 - 2014
An all sky optical imaging system was operated from Sriharikota rocket range (SHAR) (14°N, 80°E, 5.5°N dip latitude) during January–March, 1993 to observe ionospheric plasma depletions through 630 nm and 777.4 nm night glow emissions. Strong plasma depletions were observed only on four nights viz., 14, 17, 19 and 21 February, 1993. Except the 17 February, which was a magnetically disturbed day, al......
A simple method to evaluate the uncertainty of magnetotelluric forward modeling for practical three-dimensional conductivity structure models
Earth, Planets and Space - Tập 75 - Trang 1-17 - 2023
The forward calculation of magnetotelluric (MT) responses is generally assumed to be sufficiently accurate compared with typical observational errors in practical modeling and inversion studies. Although the uncertainty of the forward calculation may be examined by comparison with analytical or other numerical solutions for some simple models, such an examination does not guarantee that the uncert......
Dislocation model for strain accumulation in a plate collision zone
Earth, Planets and Space - Tập 52 - Trang 1091-1094 - 2014
Following a scheme developed for a subduction zone by Savage in 1983, which was successfully applied to a transform plate boundary by Matsu’ura and others in 1986, a dislocation model for a plate collision zone is formulated. The solution consists of a rigid plate motion and a tensile dislocation. In addition to this, a strike-slip dislocation is needed when the collision boundary is not perpendic......
Investigation of geomagnetic reference models based on the Iridium $$^{\circledR }$$ constellation
Earth, Planets and Space - Tập 74 - Trang 1-21 - 2022
The World Magnetic Model (WMM) is a geomagnetic main field model that is widely used for navigation by governments, industry and the general public. In recent years, the model has been derived using high accuracy magnetometer data from the Swarm mission. This study explores the possibility of developing future WMMs in the post-Swarm era using data from the Iridium satellite constellation. Iridium ......
Special Issue “Global data systems for the study of solar-terrestrial variability”
Earth, Planets and Space - Tập 69 Số 1 - 2017
Estimation of shallow S-wave velocity structure using microtremor array exploration at temporary strong motion observation stations for aftershocks of the 2016 Kumamoto earthquake
Earth, Planets and Space - Tập 68 - Trang 1-10 - 2016
Shallow S-wave velocity V
S profiles were estimated for 26 temporary strong motion observation sites surrounding the epicenters of a sequence of the 2016 Kumamoto earthquake. The microtremor array method was used to gather the dispersion characteristics of Rayleigh waves. V
S profiles were obtained by inverting the dispersion curves for each site and......
Seismic and aseismic fault slip before and during the 2011 off the Pacific coast of Tohoku Earthquake
Earth, Planets and Space - Tập 63 - Trang 637-642 - 2011
The March 11, 2011, off the Pacific coast of Tohoku Earthquake is the first great subduction zone earthquake to be recorded by a dense, modern network of geodetic quality Global Positioning System (GPS) receivers, and hence presents an unprecedented opportunity to study the evolution of fault slip during the time periods immediately before, during, and after a truly great earthquake. We utilized s......
Development of a coronal mass ejection arrival time forecasting system using interplanetary scintillation observations
Earth, Planets and Space - Tập 71 - Trang 1-11 - 2019
Coronal mass ejections (CMEs) cause disturbances in the environment of the Earth when they arrive at the Earth. However, the prediction of the arrival of CMEs still remains a challenge. We have developed an interplanetary scintillation (IPS) estimation system based on a global magnetohydrodynamic (MHD) simulation of the inner heliosphere to predict the arrival time of CMEs. In this system, the ini......
Subsurface structures derived from receiver function analysis and relation to hypocenter distributions in the region from the eastern Shikoku to the northern Chugoku districts, Southwest Japan
Earth, Planets and Space - Tập 60 - Trang 573-579 - 2008
We carried out receiver function imaging to estimate detailed configurations of the Philippine Sea (PHS) slab beneath the Shikoku and Chugoku districts and crustal structures in the region. We used two temporary seismic arrays with an average station spacing of about 10 km in the Chugoku district. Beneath Shikoku a clear northward dipping discontinuity at about 20–40 km depth was found, with other......
Contributions of the external field to the observatory annual means and a proposal for their corrections
Earth, Planets and Space - Tập 59 - Trang 251-257 - 2007
In this study we separate, interpret and explain magnetospheric and ionospheric signals present in the observatory annual means. The data from 46 European geomagnetic observatories collected over 42 years (1960–2001) are used. To characterise the various field components, we use predictions from latest magnetic field models. The core field and its secular variation are described by the CM4 model, ......
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