Articles

Determination of temporal changes in seismic velocity caused by volcanic activity in and around Hakone volcano, central Japan, using ambient seismic noise records

Autocorrelation functions (ACFs) for ambient seismic noise are considered to be useful tools for estimating temporal changes in the subsurface structure. Velocity changes at Hakone volcano in central Japan, wh...

Authors: Yohei Yukutake, Tomotake Ueno and Kazuki Miyaoka

Simple stochastic cellular automaton model for starved beds and implications about formation of sand topographic features in terms of sand flux

A simple stochastic cellular automaton model is proposed for simulating bedload transport, especially for cases with a low transport rate and where available sediments are very sparse on substrates in a subaqu...

Authors: Noritaka Endo

Melting carbonated epidote eclogites: carbonatites from subducting slabs

Current knowledge on the solidus temperature for carbonated eclogites suggests that carbonatitic liquids should not form from a subducted oceanic lithosphere at sub-arc depth. However, the oceanic crust includ...

Authors: Stefano Poli

A record of the upper Olduvai geomagnetic polarity transition from a sediment core in southern Yokohama City, Pacific side of central Japan

A detailed paleomagnetic record of the upper Olduvai polarity transition was obtained from a 106.72 m-long sediment core drilled in southern Yokohama City, located on the northern Miura Peninsula, on the Pacif...

Authors: Chie Kusu, Makoto Okada, Atsushi Nozaki, Ryuichi Majima and Hideki Wada

Major element composition of an Early Enriched Reservoir: constraints from ¹⁴²Nd/¹⁴⁴Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite

The Accessible Silicate Earth (ASE) has a higher ¹⁴²Nd/¹⁴⁴Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from these chondrites, a complement low-¹⁴²Nd/¹⁴⁴Nd reservoir is needed. Such ...

Authors: Nozomi Kondo, Takashi Yoshino, Kyoko N. Matsukage and Tetsu Kogiso

Preface for the article collection “Land–Ocean Linkages under the Influence of the Asian Monsoon”

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Authors: Ryuji Tada and Richard W. Murray

Extreme geomagnetically induced currents

We propose an emergency alert framework for geomagnetically induced currents (GICs), based on the empirically extreme values and theoretical upper limits of the solar wind parameters and of dB/dt, the time deriva...

Authors: Ryuho Kataoka and Chigomezyo Ngwira

The middle atmospheric circulation of a tidally locked Earth-like planet and the role of the sea surface temperature

We investigate the influence of the sea surface temperature (SST) changes on the middle atmosphere of a tidally locked Earth-like planet orbiting a G star using the coupled 3D chemistry-climate model CESM1(WAC...

Authors: Elisavet Proedrou, Klemens Hocke and Peter Wurz

A review of progress towards understanding the transient global mean surface temperature response to radiative perturbation

The correct understanding of the transient response to external radiative perturbation is important for the interpretation of observed climate change, the prediction of near-future climate change, and committe...

Authors: Masakazu Yoshimori, Masahiro Watanabe, Hideo Shiogama, Akira Oka, Ayako Abe-Ouchi, Rumi Ohgaito and Youichi Kamae

Hydrous Na-garnet from Garnet Ridge; products of mantle metasomatism underneath the Colorado Plateau

This is the first report on amphibole exsolution in pyrope from the Colorado Plateau. Pyrope crystals delivered from mantle depths underneath the Colorado Plateau by kimberlitic volcanism at 30 Ma were collect...

Authors: Kunihiko Sakamaki, Yuto Sato and Yoshihide Ogasawara

Magnetohydrodynamics modeling of coronal magnetic field and solar eruptions based on the photospheric magnetic field

In this paper, we summarize current progress on using the observed magnetic fields for magnetohydrodynamics (MHD) modeling of the coronal magnetic field and of solar eruptions, including solar flares and coron...

Authors: Satoshi Inoue

Ultrahigh-pressure acoustic wave velocities of SiO₂-Al₂O₃ glasses up to 200 GPa

Extensive experimental studies on the structure and density of silicate glasses as laboratory analogs of natural silicate melts have attempted to address the nature of dense silicate melts that may be present ...

Authors: Itaru Ohira, Motohiko Murakami, Shinji Kohara, Koji Ohara and Eiji Ohtani

Imaging in 3D under pressure: a decade of high-pressure X-ray microtomography development at GSECARS

The high-pressure X-ray microtomography (HPXMT) apparatus has been operating at the GeoSoilEnviroCARS (GSECARS) bending magnet beamline at the Advanced Photon Source since 2005. By combining the powerful synch...

Authors: Tony Yu, Yanbin Wang and Mark L. Rivers

Resolution dependence of deep convections in a global simulation from over 10-kilometer to sub-kilometer grid spacing

The success of sub-kilometer global atmospheric simulation opens the door for resolving deep convections, which are fundamental elements of cloudy disturbances that drive global circulation. A previous study f...

Authors: Yoshiyuki Kajikawa, Yoshiaki Miyamoto, Ryuji Yoshida, Tsuyoshi Yamaura, Hisashi Yashiro and Hirofumi Tomita

Philippine Sea Plate inception, evolution, and consumption with special emphasis on the early stages of Izu-Bonin-Mariana subduction

We compiled the most relevant data acquired throughout the Philippine Sea Plate (PSP) from the early expeditions to the most recent. We also analyzed the various explanatory models in light of this updated dat...

Authors: Serge Lallemand

Hydrogen and carbon isotope systematics in hydrogenotrophic methanogenesis under H₂-limited and H₂-enriched conditions: implications for the origin of methane and its isotopic diagnosis

Hydrogen and carbon isotope systematics of H₂O–H₂–CO₂–CH₄ in hydrogenotrophic methanogenesis and their relation to H₂ availability were investigated. Two H₂-syntrophic cocultures of fermentatively hydrogenogenic ...

Authors: Tomoyo Okumura, Shinsuke Kawagucci, Yayoi Saito, Yohei Matsui, Ken Takai and Hiroyuki Imachi

Unit cell determination of coexisting post-perovskite and H-phase in (Mg,Fe)SiO₃ using multigrain XRD: compositional variation across a laser heating spot at 119 GPa

Multigrain X-ray diffraction (XRD) can be used to accurately calculate the unit cell parameters of individual mineral phases in a mineral assemblage contained in a diamond anvil cell (DAC). Coexisting post-per...

Authors: Li Zhang, Yue Meng and Ho-kwang Mao

Examination of the largest-possible tsunamis (Level 2) generated along the Nankai and Suruga troughs during the past 4000 years based on studies of tsunami deposits from the 2011 Tohoku-oki tsunami

Japanese historical documents reveal that Mw 8 class earthquakes have occurred every 100–150 years along the Suruga and Nankai troughs since the 684 Hakuho earthquake. These earthquakes have commonly caused la...

Authors: Akihisa Kitamura

Transitional changes in microfossil assemblages in the Japan Sea from the Late Pliocene to Early Pleistocene related to global climatic and local tectonic events

Many micropaleontological studies based on data from on-land sections, oil wells, and deep-sea drilling cores have provided important information about environmental changes in the Japan Sea that are related t...

Authors: Takuya Itaki

Sound velocities of bridgmanite from density of states determined by nuclear inelastic scattering and first-principles calculations

Sound velocities of bridgmanite measured in the laboratory are a key to deciphering the composition of the lower mantle. Here, we report Debye sound velocities determined using nuclear inelastic scattering (NI...

Authors: Catherine McCammon, Razvan Caracas, Konstantin Glazyrin, Vasily Potapkin, Anastasia Kantor, Ryosuke Sinmyo, Clemens Prescher, Ilya Kupenko, Aleksandr Chumakov and Leonid Dubrovinsky

Mantle hydration and Cl-rich fluids in the subduction forearc

In the forearc region, aqueous fluids are released from the subducting slab at a rate depending on its thermal state. Escaping fluids tend to rise vertically unless they meet permeability barriers such as the ...

Authors: Bruno Reynard

An experimental study on the rate and mechanism of capillary rise in sandstone

The Lucas-Washburn equation is a fundamental expression used to describe capillary rise in geologic media on the basis of pore radius, liquid viscosity, surface tension, contact angle, and time. It is known th...

Authors: Yuya Tsunazawa, Tadashi Yokoyama and Naoki Nishiyama

Impact-induced melting during accretion of the Earth

Because of the high energies involved, giant impacts that occur during planetary accretion cause large degrees of melting. The depth of melting in the target body after each collision determines the pressure a...

Authors: Jellie de Vries, Francis Nimmo, H. Jay Melosh, Seth A. Jacobson, Alessandro Morbidelli and David C. Rubie

Preface for the article collection of “Multidisciplinary Researches on Deep Interiors of the Earth and Planets”

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Authors: Satoru Tanaka, Jonathan Aurnou and Michael Bergman

Mass accumulation rate of detrital materials in Lake Suigetsu as a potential proxy for heavy precipitation: a comparison of the observational precipitation and sedimentary record

In the densely populated region of East Asia, it is important to know the mechanism, scale, and frequency of heavy precipitation brought about during the monsoons and typhoons. However, observational data, whi...

Authors: Yoshiaki Suzuki, Ryuji Tada, Kazuyoshi Yamada, Tomohisa Irino, Kana Nagashima, Takeshi Nakagawa and Takayuki Omori

Evolution and variability of the Asian monsoon and its potential linkage with uplift of the Himalaya and Tibetan Plateau

Uplift of the Himalaya and Tibetan Plateau (HTP) and its linkage with the evolution of the Asian monsoon has been regarded as a typical example of a tectonic–climate linkage. Although this linkage remains unpr...

Authors: Ryuji Tada, Hongbo Zheng and Peter D. Clift

A review by the chief editors of some of the most popular papers published by PEPS in 2014–2015

Authors: Yasufumi Iryu, Kiyoshi Kuramoto, Masaki Satoh, Jun Matsumoto, Shoichi Yoshioka, Hodaka Kawahata and Ryuji Tada

New parameter of roundness R: circularity corrected by aspect ratio

In this paper, we propose a new roundness parameter R, to denote circularity corrected by aspect ratio. The basic concept of this new roundness parameter is given by the following equation:

Authors: Yasuhiro Takashimizu and Maiko Iiyoshi

Geochemical approaches to the quantification of dispersed volcanic ash in marine sediment

Volcanic ash has long been recognized in marine sediment, and given the prevalence of oceanic and continental arc volcanism around the globe in regard to widespread transport of ash, its presence is nearly ubi...

Authors: Rachel P. Scudder, Richard W. Murray, Julie C. Schindlbeck, Steffen Kutterolf, Folkmar Hauff, Michael B. Underwood, Samantha Gwizd, Rebecca Lauzon and Claire C. McKinley

Hydrogen-rich hydrothermal environments in the Hadean ocean inferred from serpentinization of komatiites at 300 °C and 500 bar

Serpentinization of Al-depleted and Al-undepleted komatiites (and olivine for comparison) was experimentally characterized under high-temperature and high-pressure conditions of 300 °C and 500 bar to evaluate ...

Authors: Takazo Shibuya, Motoko Yoshizaki, Masahiko Sato, Kenji Shimizu, Kentaro Nakamura, Soichi Omori, Katsuhiko Suzuki, Ken Takai, Hideo Tsunakawa and Shigenori Maruyama

Overview of the development of the Aerosol Loading Interface for Cloud microphysics In Simulation (ALICIS)

This review summarizes the scientific background of and past/prospective update strategies for the development of the Aerosol Loading Interface for Cloud microphysics In Simulation (ALICIS). ALICIS provides a ...

Authors: Takamichi Iguchi, In-Jin Choi, Yousuke Sato, Kentaroh Suzuki and Teruyuki Nakajima

Atmospheric radioactivity over Tsukuba, Japan: a summary of three years of observations after the FDNPP accident

A severe accident occurred in March 2011 at the Fukushima Dai-ichi nuclear power plant (FDNPP) operated by the Tokyo Electric Power Company (TEPCO), causing serious environmental pollution over a wide range co...

Authors: Yasuhito Igarashi, Mizuo Kajino, Yuji Zaizen, Kouji Adachi and Masao Mikami

Sea surface temperature proxies (alkenones, foraminiferal Mg/Ca, and planktonic foraminiferal assemblage) and their implications in the Okinawa Trough

We reviewed three sea surface temperature (SST) proxies in the Okinawa Trough (OT): alkenones, planktonic foraminiferal Mg/Ca, and planktonic foraminiferal assemblages. The seasonal and vertical distribution p...

Authors: Ryoung Ah Kim, Kyung Eun Lee and Si Woong Bae

Ensemble experiments using a nested LETKF system to reproduce intense vortices associated with tornadoes of 6 May 2012 in Japan

Experiments simulating intense vortices associated with tornadoes that occurred on 6 May 2012 on the Kanto Plain, Japan, were performed with a nested local ensemble transform Kalman filter (LETKF) system. Inte...

Authors: Hiromu Seko, Masaru Kunii, Sho Yokota, Tadashi Tsuyuki and Takemasa Miyoshi

Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceans

Carbonate precipitation is a major process in the global carbon cycle. It was recently proposed that authigenic carbonate (carbonate precipitated in situ at the sediment–water interface and/or within the sedim...

Authors: Masafumi Saitoh, Yuichiro Ueno, Yukio Isozaki, Takazo Shibuya, Jianxin Yao, Zhansheng Ji, Katsumi Shozugawa, Motoyuki Matsuo and Naohiro Yoshida

Dynamic responses of the Earth’s outer core to assimilation of observed geomagnetic secular variation

Assimilation of surface geomagnetic observations and geodynamo models has advanced very quickly in recent years. However, compared to advanced data assimilation systems in meteorology, geomagnetic data assimil...

Authors: Weijia Kuang and Andrew Tangborn

Iron snow, crystal floats, and inner-core growth: modes of core solidification and implications for dynamos in terrestrial planets and moons

Recent planetary space missions, new experimental data, and advanced numerical techniques have helped to improve our understanding of the deep interiors of the terrestrial planets and moons. In the present rev...

Authors: Doris Breuer, Tina Rueckriemen and Tilman Spohn

An in situ experimental study of Zr⁴⁺ transport capacity of water-rich fluids in the temperature and pressure range of the deep crust and upper mantle

Throughout the Earth’s history, mass transport involved fluids. In order to address the circumstances under which Zr⁴⁺ may have been transported in this manner, its solubility behavior in aqueous fluid with and w...

Authors: Bjorn Mysen

Simultaneous measurements of elastic wave velocities and electrical conductivity in a brine-saturated granitic rock under confining pressures and their implication for interpretation of geophysical observations

Simultaneous measurements of elastic wave velocity and electrical conductivity in a brine-saturated granitic rock were conducted under confining pressures of up to 180 MPa. Contrasting changes in velocity and ...

Authors: Tohru Watanabe and Akiyoshi Higuchi

Marine tephra in the Japan Sea sediments as a tool for paleoceanography and paleoclimatology

Tephra is a product of large and explosive volcanic events and can travel thousands of kilometers before deposition. Consequently, tephra deposits are common in terrestrial, lacustrine, marine, and glacial env...

Authors: Ken Ikehara

Effect of width, amplitude, and position of a core mantle boundary hot spot on core convection and dynamo action

Within the fluid iron cores of terrestrial planets, convection and the resulting generation of global magnetic fields are controlled by the overlying rocky mantle. The thermal structure of the lower mantle det...

Authors: Wieland Dietrich, Johannes Wicht and Kumiko Hori

Complex inner core boundary from frequency characteristics of the reflection coefficients of PKiKP waves observed by Hi-net

Frequency-dependent reflection coefficients of P waves at the inner core boundary (ICB) are estimated from the spectral ratios of PKiKP and PcP waves observed by the high-sensitivity seismograph network (Hi-ne...

Authors: Satoru Tanaka and Hrvoje Tkalčić

MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

The application of medium-frequency (MF) and high-frequency (HF) partial reflection radar to investigate the neutral upper atmosphere is one of the oldest such techniques still regularly in use. The techniques...

Authors: Iain Murray Reid

Geochemistry of fine-grained sediments in the Yangtze River and the implications for provenance and chemical weathering in East Asia

In order to interpret the marine clastic record preserved in the sedimentary basins of the East Asian marginal seas, it is important to understand how sediment transport and chemical weathering affect the comp...

Authors: Mengying He, Hongbo Zheng, Peter D. Clift, Ryuji Tada, Weihua Wu and Chao Luo

Evidence for natural molecular hydrogen seepage associated with Carolina bays (surficial, ovoid depressions on the Atlantic Coastal Plain, Province of the USA)

A study of soil gases was made in North Carolina (USA) in and around morphological depressions called “Carolina bays.” This type of depression is observed over the Atlantic coastal plains of the USA, but their...

Authors: Viacheslav Zgonnik, Valérie Beaumont, Eric Deville, Nikolay Larin, Daniel Pillot and Kathleen M. Farrell

Can clay minerals account for the behavior of non-asperity on the subducting plate interface?

Seismicity along the subducting plate interface shows regional variation, which has been explained by the seismic asperity model where large earthquakes occur at strongly coupled patches that are surrounded by...

Authors: Ikuo Katayama, Tatsuro Kubo, Hiroshi Sakuma and Kenji Kawai

Liquid sodium models of the Earth’s core

Our understanding of the dynamics of the Earth’s core can be advanced by a combination of observation, experiments, and simulations. A crucial aspect of the core is the interplay between the flow of the conduc...

Authors: Matthew M. Adams, Douglas R. Stone, Daniel S. Zimmerman and Daniel P. Lathrop

Advancing the understanding of the Sun–Earth interaction—the Climate and Weather of the Sun–Earth System (CAWSES) II program

The Scientific Committee on Solar–Terrestrial Physics (SCOSTEP) of the International Council for Science (ICSU) implemented an international collaborative program called Climate and Weather of the Sun–Earth Syste...

Authors: Toshitaka Tsuda, Marianna Shepherd and Nat Gopalswamy

Geographical distribution of shear wave anisotropy within marine sediments in the northwestern Pacific

In the northwestern Pacific, the elastic properties of marine sediments, including P-wave velocities (Vp) and S wave velocities (Vs), have recently been constrained by active seismic surveys. However, information...

Authors: Takashi Tonegawa, Yoshio Fukao, Gou Fujie, Shunsuke Takemura, Tsutomu Takahashi and Shuichi Kodaira

Towards more realistic core-mantle boundary heat flux patterns: a source of diversity in planetary dynamos

Mantle control on planetary dynamos is often studied by imposing heterogeneous core-mantle boundary (CMB) heat flux patterns on the outer boundary of numerical dynamo simulations. These patterns typically ente...

Authors: Hagay Amit, Gaël Choblet, Peter Olson, Julien Monteux, Frédéric Deschamps, Benoit Langlais and Gabriel Tobie