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The relationship between the rise time, dT, and amplitude, dH, of geomagnetic sudden commencements (SCs) observed on the ground is studied paying special attention to problems of data used in analyses by previous...
K-Ar age determinations were made on two monogenetic volcanoes in the Auckland volcanic field, New Zealand, which have recorded the Auckland geomagnetic excursions. For the Wiri volcano with the north-down int...
Electric and magnetic field variations inside the plasmasphere associated with SCs identified on the ground are analyzed based on the Akebono satellite observations which have been carried out more than 13 yea...
A special fog observation campaign was conducted in the Miyoshi basin, Hiroshima prefecture, Japan during the period November 7–15, 2000. We observed the spatial distributions of fogs and their movements using...
Atmospheric density and pressure in the upper mesosphere-lower thermosphere (MLT) region, around 90 km, are inferred from the meteor trail ambipolar diffusion coefficients, D, and simultaneously observed airglow ...
A practical method for inverting static-shifted magnetotelluric (MT) data to produce a 3-D resistivity model is presented. Static-shift parameters are incorporated into an iterative, linearized inversion metho...
Wide band magnetotelluric (MT) studies were undertaken over a 130 km long, approximately north-south profile in central India across the Narmada Son lineament (NSL) that runs through Indian peninsula in ENE-WS...
We propose a new inversion method for vector magnetic field data, which uses the Genetic Algorithm in a space domain calculation to determine the best-fitting 2.5-dimensional (2.5-D) structure. This 2.5-D mode...
Phase separation of seawater is an important process controlling the dynamics and chemistry of hydrothermal circulation. We numerically investigate hydrothermal circulation in porous media, including phase sep...
The Erratum to this article has been published in Earth, Planets and Space 2014 56:Art10
Volcanic eruptions preceded by seismicity, and great earthquakes (magnitude, M ≥ 7.6) within 100 km depth during a period of 123 years from 1880 to 2003 along the Pacific and Philippine Sea Plate in Japan are ...
An eastern half of the focal region of the 1854 Ansei-Tokai earthquake was not ruptured at the 1944 Tonankai earthquake and the area around Suruga Bay remained as a seismic gap (Ishibashi, 1981). As to the cau...
High-quality seismic data recorded during the 1999 Taiwan Chi-Chi earthquake (Mw=7.6) show that a small-scale orogenic process of both mountain-building and crust-thickening was simultaneously accomplished alo...
The combination of rock velocities with a seismic signature has been used as a clue to understanding the structure and evolution of the continental lithosphere. The lower crustal reflectivity beneath part of t...
The southern Indian shield, characterised by several prominent geological and geophysical features, can be divided into three distinct tectonic segments: Western Dharwar craton (WDC), Eastern Dharwar craton (E...
Estimates of crustal thicknesses using Pn times and receiver functions agree well for the southern part of the Kaapvaal craton, but not for the northern region. The average crustal thicknesses determined from Pn ...
Some examples of electric and magnetic field variations have recently been reported by Honkura and his colleagues in association with earthquakes, and these variations have been interpreted by them in terms of...
An earthquake of M7.1 occurred off Miyagi Prefecture, NE Japan, on May 26, 2003 at the depth of about 70 km. Just two months later, on July 26, 2003, another shallow earthquake of M6.4 occurred in northern Miy...
We applied synthetic aperture radar (SAR) interferometry to map the deformation field of the northern Miyagi earthquake (M6.4) which occurred on July 26, 2003. RADARSAT-1 and ENVISAT satellite data were proces...
On July 26, 2003, a disastrous earthquake with M6.4 struck the northern part of Miyagi prefecture, northern Honshu, Japan. GPS measurements and leveling surveys conducted by the Geographical Survey Institute (...
The waveform inversions for the 2003 Miyagi-ken Hokubu earthquake sequence were performed using strong-motion records to determine the source processes. We carried out the inversions for the foreshock (M5.6), ...
We relocated hypocenters of the March 4, 1952 Tokachi-oki (M j 8.2) earthquake and its aftershocks by reassessing data of the Central Meteorological Station network at the time ...
The strong motion and geodetic data were individually inverted for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake with a hypocenter 25 km deep and a fault plane above the subducting Pacific s...
The Erratum to this article has been published in Earth, Planets and Space 2014 56:Art12
A great earthquake, named the 2003 Tokachi-oki earthquake, occurred in the southern Kuril subduction zone on 26th September 2003,4:50 JST (41.7797°N, 144.0795°E, 42 km depth; Japan Meteorological Agency). Its ...
The Erratum to this article has been published in Earth, Planets and Space 2014 56:Art11
Study of the lunar gravity anomaly has not been straightforward since direct tracking data of lunar satellites are available only at its nearside. In such a case, direct inversion of the line-of-sight accelera...
The accretion rate of micrometeorites in the last glacial period was estimated from the concentrations of micrometeorites in the blue ice around the Yamato Mts. in Antarctica. The samples from this study were ...
The quiet-time geomagnetic variations at high latitudes have not been systematically studied so far. Here we present quiet-time variation results from more than two years of continuous magnetic observations in...
On 21 September 1999 (Taiwan local time), a major earthquake measuring M7.3 occurred near the town of Chi-Chi in central Taiwan. After the Chi-Chi earthquake, geomagnetic data recorded by a network of 8 statio...
The current GPS satellite constellation provides limited availability and reliability for a country like Japan where mountainous terrain and urban canyons do not allow a clear skyline to the horizon. At presen...
The Indonesian gravity field is neither accurately nor comprehensively determined, especially due to inadequacy of land gravity data. This study deals with determination of Indonesian land gravity and proposes...
We have studied differences in ground motion and fault rupture characteristics between surface rupture and buried rupture earthquakes. We found that the ground motion generated by buried rupture in the period ...
A shallow M6.4 earthquake with a M5.6 foreshock and the M5.5 largest aftershock occurred in northern Miyagi Prefecture, northeastern Japan on July 26, 2003. The coseismic displacement was observed not only by ...
A shallow M6.4 inland earthquake occurred on July 26, 2003 in the northern part of Miyagi Prefecture, northeastern Japan. We precisely located hypocenters of this event, its foreshocks and aftershocks by apply...
A M7.1 intra-slab earthquake occurred on May 26, 2003 at a depth of 68 km off-shore Miyagi Prefecture, northeastern Japan. The epicenter of this event was located about 80 km NNE from the epicenter of the 1978...
We conducted a temporary seismic observation just after the occurrence of July 26, 2003, M6.4 northern Miyagi earthquake, in order to precisely locate aftershock hypocenters. Thirteen portable data-logger stat...
A quasi-14 month fluctuation in the atmospheric excitation function for the Earth’s wobble is discussed by using the re-analysis data of the European Center for Medium-range Weather Forecast for the 14 years b...
On September 26, 2003, a large earthquake with a magnitude of 8.0 occurred along the Kuril trench off Tokachi, Hokkaido, Japan. We investigated the source process by using teleseismic P- and SH-wave data. The mai...
The earthquake (Mw 6.2, Ms 6.4) of 14 August 2003 which occurred in the Lefkada segment of the Cephalonia Transform Fault, Ionian Sea (Greece), was associated with dextral strike-slip faulting striking NNE-SSW. R...
The observations made by Sakigake revealed the asymmetric distribution of the interaction region of Halley’s comet, and the center of the interaction region was shifted toward the post-encounter side on the sp...
Simultaneous measurements of atmospheric Maxwell current and electric field, using horizontal long wire antenna and passive horizontal wire antenna system at 1 m above the Earth’s surface, were carried out at ...
MF radar observations of hourly mean zonal and meridional winds at 86 km over Tirunelveli (8.7°N, 77.8°E), India, over a period of five years (1993–1997) are utilized to study the possible influence of stratos...
Based on the fair weather days of 1993 surface electric field at Pune (18 32 N, 73 51 E, 550 m ASL) is studied for its diurnal and seasonal variations. The analysis attempts to look into factors like atmospher...
The high strain rates of the Niigata-Kobe Tectonic Zone (NKTZ) of central Japan have been simulated using a viscoelastic finite element model of great interplate earthquake cycles that includes the subducting ...
I present a model to explain seismicity variations along consuming and transform fault plate boundaries. The basic assumptions of the model are: (1) plate boundary fault zones consist of asperities and barrier...
The nature and location of the present EUR/AFR boundary configuration in the Azores region is controversial and, in particular, the pattern of the present day deformation associated with plate boundary process...
Ionospheric equivalent currents are defined as spherical sheet currents, which reproduce the observed magnetic disturbances below the ionosphere. One way of determining these currents is to place several so ca...
Using Australian records, we studied six isolated geomagnetic storms for the regional effects of their associated magnetic fields, emphasizing the linear regression correlation coefficient between station loca...
Multi-Frequency VLBI (MFV) is one of the most powerful methods for precise positioning of spacecrafts. The system transmits three carrier waves at S-band and one wave at X-band. These frequencies are set to re...
A GPS/Acoustic experiment on the southeastern slope of Hawaii Island presented precise seafloor positioning in the condition of large water depth (2.5—4.5 km) and large velocity variations. We estimated sound ...
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