Yuhji Yamamoto
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View article: Regional archeointensity curve ArchJSK2k from 600 BCE to 1700 CE for East Asia and possible recurrence of the West Pacific Anomaly
Regional archeointensity curve ArchJSK2k from 600 BCE to 1700 CE for East Asia and possible recurrence of the West Pacific Anomaly Open
View article: Rapid Holocene deposition in the Mackenzie Trough and Barrow Canyon areas in the western Arctic Ocean
Rapid Holocene deposition in the Mackenzie Trough and Barrow Canyon areas in the western Arctic Ocean Open
The Arctic Ocean and terrestrial environment have recently been reported to be changing drastically, but it is unclear whether these changes are similar to natural variations in the past or how sudden and large the changes are compared to …
View article: Using archaeomagnetism to unravel the occupational history of a medieval site: Cañada Real (Burgos, Northern Spain)
Using archaeomagnetism to unravel the occupational history of a medieval site: Cañada Real (Burgos, Northern Spain) Open
View article: Degradation of Excavated PVC Toys and Their Role as Technofossils in the Anthropocene
Degradation of Excavated PVC Toys and Their Role as Technofossils in the Anthropocene Open
View article: Variations in pore structure in subaerial lava flows at Nishinoshima, Japan, inferred from physical properties
Variations in pore structure in subaerial lava flows at Nishinoshima, Japan, inferred from physical properties Open
View article: Application of a recently developed method of oriented drill coring to accumulative tephra layers: identification of the Matuyama–Brunhes geomagnetic reversal in Akan caldera-forming eruption deposits
Application of a recently developed method of oriented drill coring to accumulative tephra layers: identification of the Matuyama–Brunhes geomagnetic reversal in Akan caldera-forming eruption deposits Open
We adapted a recently developed technique of oriented drill coring (100 m in depth) for paleomagnetic measurements, including additional techniques such as half-cutting of the drill cores and accurate cube sampling using an apparatus that …
View article: Reliability of the palaeomagnetic signal recorded in a lava flow erupted on 4 December 2021 in La Palma (Canary Islands, Spain)
Reliability of the palaeomagnetic signal recorded in a lava flow erupted on 4 December 2021 in La Palma (Canary Islands, Spain) Open
SUMMARY A basaltic lava flow erupted from the Tajogaite volcano on 4 December 2021, in La Palma (Canary Islands, Spain) was sampled to find out to what extent reliable and correct information on both intensity and direction of the Earth's …
View article: The Culprit of Bias for Paleointensity Estimation in the Shaw‐Type Protocol and an Innovative Calculation Method
The Culprit of Bias for Paleointensity Estimation in the Shaw‐Type Protocol and an Innovative Calculation Method Open
Paleointensity records are vital for understanding the Earth's evolution, but obtaining accurate paleointensity is a challenging task. The Shaw‐type method, a widely‐used paleointensity protocol, produces biased results occasionally despit…
View article: Full vector record of the Earth’s Magnetic Field from Upper Pleistocene to prehistoric Holocene lava-flows in La Palma (Canary Islands, Spain)
Full vector record of the Earth’s Magnetic Field from Upper Pleistocene to prehistoric Holocene lava-flows in La Palma (Canary Islands, Spain) Open
La Palma, located in the westernmost part of the Canarian Archipelago, is one of the youngest islands in the archipelago. In this study, we present a paleomagnetic and paleointensity study performed in lava-flows from Upper Pleistocene and…
View article: The Culprit of Bias in the Shaw-type Method of Estimating Geomagnetic Paleointensity and an Innovative Computational Method for Enhanced Reliability
The Culprit of Bias in the Shaw-type Method of Estimating Geomagnetic Paleointensity and an Innovative Computational Method for Enhanced Reliability Open
Retrieving precise information about the ancient geomagnetic field strength (paleointensity) is crucial for understanding the Earth's interior evolution. The Shaw-type method is one of the major protocols used to estimate paleointensity, c…
View article: New absolute paleomagnetic intensity data from Cenozoic basalts of Northeast China and exploring rock-magnetic parameters for efficient sample preselection on the Tsunakawa–Shaw paleointensity method
New absolute paleomagnetic intensity data from Cenozoic basalts of Northeast China and exploring rock-magnetic parameters for efficient sample preselection on the Tsunakawa–Shaw paleointensity method Open
Despite being essential in determining absolute paleomagnetic field intensity (API) with high fidelity over Earth science research topics, API determination still suffers little quantitative success. This is due to common nonideal magnetic…
View article: Correction: Paleomagnetism and paleomagnetic dating to large volcanic bombs: an example from the historical eruption of Azuma–Jododaira volcano, NE Japan
Correction: Paleomagnetism and paleomagnetic dating to large volcanic bombs: an example from the historical eruption of Azuma–Jododaira volcano, NE Japan Open
View article: Paleomagnetism and paleomagnetic dating to large volcanic bombs: an example from the historical eruption of Azuma–Jododaira volcano, NE Japan
Paleomagnetism and paleomagnetic dating to large volcanic bombs: an example from the historical eruption of Azuma–Jododaira volcano, NE Japan Open
Vulcanian activity is one of the most common eruption styles of arc andesitic volcanism on Earth. It ejects and deposits volcanic bombs around the source crater. Although paleomagnetic studies of volcanic bombs are limited, such studies ca…
View article: A curation for uncontaminated Hayabusa2-returned samples in the extraterrestrial curation center of JAXA: from the beginning to present day
A curation for uncontaminated Hayabusa2-returned samples in the extraterrestrial curation center of JAXA: from the beginning to present day Open
Developing a cleanroom and clean chambers (CCs) for Hayabusa2 returned samples has been discussed with the committee for Hayabusa2 sample curation facility since 2015. One major difference from the specifications of the CCs used for Itokaw…
View article: Active sediment transport along trench axis: insights from X-ray fluorescence core scanning and magnetic analysis of marine sediments in the southwestern Ryukyu Trench
Active sediment transport along trench axis: insights from X-ray fluorescence core scanning and magnetic analysis of marine sediments in the southwestern Ryukyu Trench Open
The southwestern Ryukyu Trench is an ideal place for investigating sediment transport from the Taiwan mountain belt to the Ryukyu Trench floor. To study the characteristics of trench turbidites and sediment transport along the trench, we u…
View article: Edge‐Driven Convection Melting Before the Emplacement of the Afar Mantle Plume Head Inferred From <sup>40</sup>Ar/<sup>39</sup>Ar Dating
Edge‐Driven Convection Melting Before the Emplacement of the Afar Mantle Plume Head Inferred From <sup>40</sup>Ar/<sup>39</sup>Ar Dating Open
The Ethiopia‐Yemen flood basalts are spatially zoned with progressively lower TiO 2 lavas from near the Afar depression toward the margins. The timing and rate of emplacement of low TiO 2 (LT) lavas are poorly known compared with the ultra…
View article: Natural remanent magnetization characteristics of the upper unconsolidated sedimentary sequence of a drill core (20HCL04) from the Jeokjung-Chogye basin (impact crater), South Korea: Preliminary implication of multiple possible geomagnetic excursions within persistent normal-polarity state and notes toward magneto-chronostratigraphic contribution
Natural remanent magnetization characteristics of the upper unconsolidated sedimentary sequence of a drill core (20HCL04) from the Jeokjung-Chogye basin (impact crater), South Korea: Preliminary implication of multiple possible geomagnetic excursions within persistent normal-polarity state and notes toward magneto-chronostratigraphic contribution Open
In the Jeokjung-Chogye Basin, southeastern Korean Peninsula, presumed to be a Quaternary meteorite impact crater, an azimuthally non-oriented drill sediment core (called 20HCL04; up to 66.0 m depth) was retrieved. We conducted paleomagneti…
View article: Rotation of a Ferromanganese Nodule in the Penrhyn Basin, South Pacific, Tracked by the Earth's Magnetic Field
Rotation of a Ferromanganese Nodule in the Penrhyn Basin, South Pacific, Tracked by the Earth's Magnetic Field Open
Ferromanganese nodules are cm‐sized, authigenic, abyssal manganese‐iron‐hydroxide concretions. They grow very slowly at rates of a few mm per million years. Although their ages are older than millions of years, they are often found half bu…
View article: Rotation of a Ferromanganese Nodule in the Penrhyn Basin, South Pacific, Tracked by the Earth's Magnetic Field
Rotation of a Ferromanganese Nodule in the Penrhyn Basin, South Pacific, Tracked by the Earth's Magnetic Field Open
This archive contains data produced in the paper " Rotation of a Ferromanganese Nodule in the Penrhyn Basin, South Pacific, Tracked by the Earth’s Magnetic Field " by Oda, H., Katanoda, W., Usui, A., Murayama, M. and Yamamoto, Y. accepted …
View article: Non-plume flood basalt volcanism before the emplacement of the Afar mantle plume head
Non-plume flood basalt volcanism before the emplacement of the Afar mantle plume head Open
The Ethiopia-Yemen flood basalts are spatially zoned with progressively lower TiO2 lavas from near the Afar depression toward the margins. The timing and rate of emplacement of low TiO2 (LT) lavas are poorly known compared with the ultra-h…
View article: Three-dimensional stress state above and below the plate boundary fault after the 2011 Mw 9.0 Tohoku earthquake
Three-dimensional stress state above and below the plate boundary fault after the 2011 Mw 9.0 Tohoku earthquake Open
The Integrated Ocean Drilling Program conducted Expedition 343 and 343T, named the Japan Trench Fast Drilling Project (JFAST), to drill through the plate boundary fault that ruptured during the 2011 Mw 9.0 Tohoku earthquake in the area wit…
View article: Characteristics of Fault Rocks Within the Aftershock Cloud of the 2014 Orkney Earthquake (M5.5) Beneath the Moab Khotsong Gold Mine, South Africa
Characteristics of Fault Rocks Within the Aftershock Cloud of the 2014 Orkney Earthquake (M5.5) Beneath the Moab Khotsong Gold Mine, South Africa Open
Cores recovered during the International Continental Scientific Drilling Program project “Drilling into Seismogenic zones of M2.0 to M5.5 earthquakes in deep South African Gold Mines” include fault breccia from within the aftershock cloud …
View article: Absolute Paleointensity Experiments on Aged Thermoremanent Magnetization: Assessment of Reliability of the Tsunakawa‐Shaw and Other Methods With Implications for “Fragile” Curvature
Absolute Paleointensity Experiments on Aged Thermoremanent Magnetization: Assessment of Reliability of the Tsunakawa‐Shaw and Other Methods With Implications for “Fragile” Curvature Open
Absolute paleointensity (API) of the geomagnetic field can be estimated from volcanic rocks by comparing the natural remanent magnetization (NRM) to a laboratory‐induced thermoremanent magnetization (Lab‐TRM). Plots of NRM unblocking versu…
View article: Steady increase in geomagnetic reversal frequency after the Cretaceous Normal Superchron
Steady increase in geomagnetic reversal frequency after the Cretaceous Normal Superchron Open
The Earth's core is constantly and efficiently cooled by mantle convection. The heat flux transferred from the core to the mantle through the core-mantle boundary (CMB) is critical for understanding the dynamics of solid Earth. Although it…
View article: IODP Expedition 320, Hole U1332A - Well Logging Data
IODP Expedition 320, Hole U1332A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 320, Hole U1331A - Well Logging Data
IODP Expedition 320, Hole U1331A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 320, Hole U1331A - Well Logging Data
IODP Expedition 320, Hole U1331A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: IODP Expedition 320, Hole U1332A - Well Logging Data
IODP Expedition 320, Hole U1332A - Well Logging Data Open
Logging data are measurements of physical properties of the formation surrounding a borehole, acquired in situ after completion of coring (wireline logging) or during drilling (Logging-While-Drilling, LWD). The range of data (resistivity, …
View article: New criteria for selecting reliable Thellier-type paleointensity results from the 1960 Kilauea lava flows, Hawaii
New criteria for selecting reliable Thellier-type paleointensity results from the 1960 Kilauea lava flows, Hawaii Open
Thellier-type paleointensity experiments associated with partial thermal remanent magnetization checks have been widely used to determine paleointensity values from volcanic and archaeological media. However, previous studies have revealed…
View article: High spatial resolution magnetic mapping using ultra-high sensitivity scanning SQUID microscopy on a speleothem from the Kingdom of Tonga, southern Pacific
High spatial resolution magnetic mapping using ultra-high sensitivity scanning SQUID microscopy on a speleothem from the Kingdom of Tonga, southern Pacific Open