Methods

Strasser, Michael; Dugan, Brandon; Kanagawa, Kyuichi; Moore, G. F.; Toczko, S.; Maeda, Lena; Kido, Yukari; Moe, Kyaw Thu; Yukitoshi, Sanada; Esteban, Lionel; Fabbri, Olivier; Geersen, Jacob; Hammerschmidt, Sebastian; Hayashi, Hiroki; Heirman, K.; Hüpers, Andre; Rodriguez, M.J. Jurado; Kameo, Koji; Kanamatsu, Toshiya; Kitajima, H.; Masuda, Harue; Milliken, Kitty L.; Mishra, Ravi; Motoyama, Isao; Olcott, K.; Oohashi, Kiyokazu; Pickering, KT; Ramirez, S.G.; Rashid, Harunur; Sawyer, Dale S.; Schleicher, Anja M.; Shan, Yehua; Skarbek, R.; Song, Insun; Takeshita, Toru; Toki, Takahiro; Tudge, J.; Webb, S.; Wilson, D.J.; Wu, H.-Y.; Yamaguchi, Asuka

doi:10.2204/iodp.proc.338.102.2014

Cited by 14 publications

(43 citation statements)

References 87 publications

(95 reference statements)

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“…Schlumberger's MWD TeleScope tool provided drilling parameters, and the LWD geo-VISION tool recorded gamma ray, resistivity, and azimuthal resistivity images (see the "Methods" chapter [Strasser et al, 2014a]). Both real-time and memory data were collected.…”

Section: Logging While Drillingmentioning

confidence: 99%

“…Shallow, medium, and deep button resistivities were used to generate both statically and dynamically processed images (see "Logging while drilling" in the "Methods" chapter [Strasser et al, 2014a]). Bedding, fractures, faults, and breakouts were interpreted.…”

Section: Resistivity Image Analysismentioning

confidence: 99%

“…Bedding, fractures, faults, and breakouts were interpreted. In the absence of a caliper measurement, the bit diameter was used as the borehole diameter and assumed to be constant (see "Logging while drilling" in the "Methods" chapter [Strasser et al, 2014a]). …”

Section: Resistivity Image Analysismentioning

confidence: 99%

“…We estimated porosity using Archie's law (Archie, 1947) (see the "Methods" chapter [Strasser et al, 2014a]) and calculated seawater electrical resistivity using the temperature profile that was estimated for Site C0018 during Expedition 333. The temperature at the seafloor is estimated at 1.48°C, with an average thermal gradient of 63°C/km (Expedition 333 Scientists, 2012b).…”

Section: Physical Properties Estimation Of Porosity and Bulk Density mentioning

confidence: 99%

“…Distinct sand layers are not distinguishable in logging data, and overall, the gamma ray values for logging Subunit IB follow a higher baseline (85 gAPI) compared to logging Subunit IA (75 gAPI) with only a few clear spikes to lower gamma ray values (<60 gAPI; see "Logging while drilling"). The mismatch between core lithology and LWD data characteristics may occur because the thin sand layers (4-20 cm) are significantly smaller than the vertical resolution of the gamma ray tool (~30 cm, see the "Methods" chapter [Strasser et al, 2014a]), so the dominant signal is that of the muddy sediment, which locally is as thick as 4 m (Expedition 333 Scientists, 2012b).…”

Section: Core-log-seismic Integrationmentioning

confidence: 99%

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Site C0018

Strasser¹,

Dugan²,

Kanagawa³

et al. 2014

Proceedings of the IODP

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During Integrated Ocean Drilling Program (IODP) Expedition 338, a slope basin seaward of the megasplay fault was logged with logging while drilling (LWD)/measurement while drilling (MWD) at Site C0018. The slope basin, characterized in 3-D seismic data by stacked mass transport deposits (MTDs) was drilled and sampled during IODP Expedition 333 in Hole C0018A ( Fig. F1) (Expedition 333 Scientists, 2012a). The primary goals of operations at Site C0018 were to establish the stratigraphy of Quaternary mass-movement events and to sample the distal part of an exceptionally thick MTD for analyzing its rheological behavior to constrain sliding dynamics and tsunamigenic potential.Site C0018 (proposed Site NTS-1A; water depth = 3084.35 m) is located ~5 km southwest of IODP Sites C0004 and C0008, which were drilled and cored during IODP Expedition 316 (Figs. F1, F2). Site C0018 is located within a lower slope basin that (1) represents the depocenter for downslope mass transport, (2) is characterized by stacked MTDs that were seismically identified as acoustically transparent to chaotic bodies with ponded geometries (Fig. F2), and (3) includes a large (as thick as 182 m) MTD . Hole C0018A was drilled at a location where the MTD bodies wedge out and basal erosion is thought to be minimal. Coring to ~314.15 meters below seafloor (mbsf) allowed sampling of the MTDs across this stratigraphic succession.Sediment cored in Hole C0018A are divided into two lithologic subunits. Lithologic Subunit IA (0-190.65 mbsf) is primarily composed of hemipelagic mud (i.e., silty clay) with interbedded volcanic ash layers and is affected by MTDs, whereas lithologic .65 mbsf) is a sandy turbidite sequence (Expedition 333 Scientists, 2012a;Strasser et al., 2012). Six MTDs (numbered 1-6 from top to bottom) ranging in thickness from 50 cm to 61 m are identified within Subunit IA (Expedition 333 Scientists, 2012a;Strasser et al., 2012) (Fig. F3). These MTDs are composed of chaotic and convolute bedding with intervals of coherent bedding and commonly have bases defined by shear zones. A mass-movement event related to deposition of the lowermost and most prominent MTD 6 is younger than 1.05 Ma (because an ash layer immediately below the thick MTD 6 is identified as the one dated on land as 1.05 Ma) but older than 0.85 Ma, as constrained

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Section: Logging While Drillingmentioning

confidence: 99%

Section: Resistivity Image Analysismentioning

confidence: 99%

Section: Resistivity Image Analysismentioning

confidence: 99%

Section: Physical Properties Estimation Of Porosity and Bulk Density mentioning

confidence: 99%

Section: Core-log-seismic Integrationmentioning

confidence: 99%

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Site C0018

Strasser¹,

Dugan²,

Kanagawa³

et al. 2014

Proceedings of the IODP

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Mantle-derived fluids in the Nankai Trough Kumano forearc basin

Wiersberg

Hammerschmidt

Fuchida

et al. 2018

Prog Earth Planet Sci

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Noble gas abundance and isotope data from 12 drilling mud gas samples obtained during IODP Expeditions 338 and 348 provide new insights on fluid origin and fluid migration in the inner accretionary prism below the Kumano forearc basin offshore SE Japan. The samples originate from three adjoining boreholes (C0002F, C0002N and C0002P) spanning depths between 950 and 3050 meters below sea floor (mbsf) and are composed of air and variable contributions of mantle-derived and crustal fluids. Air-corrected 3 He/ 4 He ratios of samples from Exp. 338 fall between 0.44 ± 0.24 Ra and 3.26 ± 0.28 Ra. Samples #1400 and #1800 (sample number denotes depth in mbsf) are more influenced by radiogenic helium (1.33 ± 0.34 Ra resp. 0.44 ± 0.24 Ra), whereas the air-free helium isotopic composition of sample #950 is clearly higher (3.26 ± 0.28 Ra). Enhanced radon activity around 950 mbsf, 1100 mbsf, 1400 mbsf, and 1800 mbsf suggests active flow of fluids at these depths. The helium isotopic composition of two other samples (#1700 and #1850) collected during Exp. 338 and of all samples obtained during the 1-year-later Exp. 348 are less variable (1.74-2.46 Ra with a mean 3 He/ 4 He ratio of~2.4 Ra) and no radon anomalies were observed during sampling. For these samples, we assume migration by diffusive flow of helium-bearing fluids through sediments of the accretionary prism. In contrast, elevated radon activities and the more variable helium isotopic composition of fluids from 950, 1400, and 1800 mbsf from Exp. 338 are better explained by channelized and active fluid flow through temporarily permeable strata, maybe as a short-term episodic flow event caused by reactivation of buried trust faults. The helium isotopic composition of #950 is in good agreement with estimated helium isotope values of the subducting Philippine Sea Plate (PSP) at present (~3.4 Ra), whereas fluids from 1400 and 1800 mbsf demonstrate the input of radiogenic helium from a crustal, probably terrestrial source.

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Expedition 358 methods

Hirose¹,

Ikari²,

Kanagawa³

et al. 2020

Volume 358: NanTroSEIZE Plate Boundary Deep Riser 4: Nankai Seismogenic/Slow Slip Megathrust

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LGR's Methane Carbon Isotope Analyzer (MCIA) reports measurements of δ 13 CH 4 and methane concentration (mole fraction) directly, continuously and without sample preparation. LGR offers three models to span the entire range of methane levels in landfills, mudlogging studies, biogas reactors, and ambient air. For measurements of methane concentrations expected in ambient air near landfills and natural gas leaks, LGR's MCIA Range

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Methods

Cited by 14 publications

References 87 publications

Site C0018

Site C0018

Mantle-derived fluids in the Nankai Trough Kumano forearc basin

Expedition 358 methods

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