Response of a hydrothermal system to escalating phreatic unrest: the case of Turrialba and Irazú in Costa Rica (2007–2012)Earth, Planets and Space - Tập 73 - Trang 1-26 - 2021
D. Rouwet, R. Mora-Amador, C. Ramírez, G. González, E. Baldoni, G. Pecoraino, S. Inguaggiato, B. Capaccioni, F. Lucchi, C. A. Tranne
This study presents the first hydrogeochemical model of the hydrothermal systems of Turrialba and Irazú volcanoes in central Costa Rica, manifested as thermal springs, summit crater lakes, and fumarolic degassing at both volcanoes. Our period of observations (2007–2012) coincides with the pre- and early syn-phreatic eruption stages of Turrialba volcano that resumed volcanic unrest since 2004, afte...... hiện toàn bộ
Hypocenter and focal mechanism distributions of aftershocks of July 26 2003 M6.4 northern Miyagi, NE Japan, earthquake revealed by temporary seismic observationEarth, Planets and Space - Tập 55 - Trang 719-730 - 2014
Norihito Umino, Tomomi Okada, Junichi Nakajima, Shuichiro Hori, Toshio Kono, Takashi Nakayama, Naoki Uchida, Junpei Shimizu, Junichi Suganomata, Shantha S. N. Gamage, Akira Hasegawa, Youichi Asano
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 stations and one satellite communication telemetry station were installed in and around the focal area of the M6.4 event. Hypocenters of aftershocks were located by using data observed at those t...... hiện toàn bộ
EditorialEarth, Planets and Space - Tập 54 - Trang 1-2 - 2014
Estimation of PWC gradients over the Kanto Plain using GPS data: Validation and possible meteorological implicationsEarth, Planets and Space - Tập 52 - Trang 907-912 - 2014
Kazumasa Aonashi, Yoshinori Shoji, Ryu-ichi Ichikawa, Hiroshi Hanado
Simultaneous GPS and water vapor radiometer (WVR) observations were carried out in Tsukuba during May–June 1998, for the validation of precipitable water content (PWC) gradients estimated from single-site GPS data. Slant path PWC observed by WVR were fitted into hourly PWC gradients (WVR gradients) using the least-square method. GPS PWC gradients were retrieved from tropospheric delay gradients th...... hiện toàn bộ
The region of large site amplification in Northern Hokkaido, Japan, extends to the eastern Soya RegionEarth, Planets and Space - Tập 75 - Trang 1-11 - 2023
Atsushi Nozu
In the document titled “predominant period of long-period ground motions and the natural period of deep subsoil” by the Central Disaster Management Council, the west part of Northern Hokkaido facing the Sea of Japan is categorized as a region, where long-period (> 6 s) ground motions are predominant. In contrast, the document categorizes the east part of Northern Hokkaido as a region where short-p...... hiện toàn bộ
Differential ionosphere modelling for single-reference long-baseline GPS kinematic positioningEarth, Planets and Space - Tập 62 - Trang 915-922 - 2011
H. Dekkiche, S. Kahlouche, H. Abbas
The ionospheric effect is considered to be one of the most important error sources limiting the quality of GPS kinematic positioning. Over longer distances, differential ionospheric residuals become larger and may affect the ambiguity resolution process. We present here a Kalman-filter-based GPS ionosphere model for long-baseline kinematic applications. This observational model includes the differ...... hiện toàn bộ
On the variability of the seasonal scale oscillations over Cachoeira Paulista (22.7°S, 45°W), BrazilEarth, Planets and Space - Tập 66 - Trang 1-11 - 2014
Amitava Guharay, Paulo Prado Batista, Barclay Robert Clemesha
The characteristics of long period atmospheric oscillations are studied using long-term meteor radar wind observations over a low-latitude Brazilian station, Cachoeira Paulista (22.7°S, 45°W). The semiannual oscillation (SAO) amplitude decreases gradually with altitude in the mesopause region, while the annual oscillation (AO) amplitude exhibits a minimum at mid-mesopause with significant interann...... hiện toàn bộ
Subsurface structure and faulting of the Median Tectonic Line, southwest Japan inferred from GPS velocity fieldEarth, Planets and Space - Tập 54 - Trang 1065-1070 - 2014
Takao Tabei, Manabu Hashimoto, Shin’ichi Miyazaki, Kazuro Hirahara, Fumiaki Kimata, Takeshi Matsushima, Torao Tanaka, Yasuhide Eguchi, Takashi Takaya, Yoshinobu Hoso, Fumio Ohya, Teruyuki Kato
The Median Tectonic Line (MTL) is the longest arc-parallel fault system in southwest Japan whose right-lateral strike-slip is related to oblique subduction of the Philippine Sea plate (PH). We constructed a dense Global Positioning System network along a 200 km-long traverse line across the MTL in 1998 to estimate deep fault structure and slip distribution. Horizontal velocities were determined at...... hiện toàn bộ
Crustal movement of Antarctica and Syowa Station based on GPS measurementsEarth, Planets and Space - Tập 58 - Trang 795-804 - 2006
Mako Ohzono, Takao Tabei, Koichiro Doi, Kazuo Shibuya, Takeshi Sagiya
In Antarctica, sea level rise and crustal uplift have occurred due to ice sheet melting and mantle response since the Last Glacial Maximum (LGM). The International GNSS Service (IGS) provides continuous data at nine sites on the Antarctic plate, and we analyzed data obtained from these sites between 1998 and 2003. Additional data were acquired by campaign observations around Syowa Station carried ...... hiện toàn bộ