Twelve surface sediments from the southern Okinawa Trough (OT) and nine surface sediments from a nearby river, the Lanyang River (LR), with high sediment discharge were analyzed for comparison of their aliphatic hydrocarbon distributions. Performing cluster analysis on all hydrocarbon data of LR and OT sediments showed that the two areas had a similarity level of only 0.15, meaning that they we...

Lagoon sediments have heterogeneous structure and texture, contain shells plants are often highly bioturbated disturbed by human activities. In such sediments, the selection of representative cores choice a subsampling strategy important but difficult. this study, we examine usefulness X-ray computed tomography (CT) for inferring sediment features that will help in making optimal decisions prio...

The ability to detect and monitor any escape of carbon dioxide (CO2) from sub-seafloor CO2 storage reservoirs is essential for public acceptance capture (CCS) as a climate change mitigation strategy. Here, we use repeated high-resolution seismic reflection surveys acquired using chirp profiler mounted on an autonomous underwater vehicle (AUV), image gas released into shallow sub-surface sedimen...

This paper describes the relationship between bedrock depth (D) and site fundamental frequency (f0) in Nakdonggang delta region southeastern part of Korean peninsula. We collected borehole logs to confirm thickness sediments estimated f0 at over 200 locations across using horizontal-to-vertical spectral ratio (HVSR) method. developed an map study area by spatially interpolating values Ordinary ...

Mineralogical and oxygen isotopic analyses of samples from Deep Sea Drilling Project Sites 477, 481, and 477 in the Guaymas Basin indicate the existence of two distinct hydrothermal systems. In the first, at Sites 481 and 478, hot dolerite sills intruded into highly porous hemipelagic siliceous mudstones that were moderately rich in organic matter, thermally altered the adjacent sediments, and ...

This study uses Pu-dated varved sediments from Big Round Lake, a proglacial lake on northeast Baffin Island, Arctic Canada to generate a 1000-year-long, annual-resolution record of past climate. Varve thickness is positively correlated with July–August–September temperature measured at Clyde River, 70 km to the north of the lake (r = 0.46, p \ 0.001). We therefore interpret the variability and ...

Evaporites are typically described as impermeable seals that create some of the world's highest reservoir pressures beneath salt seal. However, several laboratory studies demonstrate evaporites can retain open pore spaces hydraulically connect sediments above and below them in sedimentary basins. During Messinian Salinity Crisis (5.97–5.33 Ma), up to 2,400 m thickness were rapidly deposited Wes...

Buoyant trench sediment generates an isostatic restoring force that opposes the slab pull of subducting plates; however, influence this on subduction dynamics is poorly understood. Here, we performed three-dimensional free simulations adopting a variety distributions along to investigate correlation between motions and heterogeneous buoyant forces. Two endmembers, sediment-rich sediment-starved...

In coastal marine sediments, denitrification and fermentation are important processes in the anaerobic decomposition of organic matter. Microbial communities performing these two processes were enriched from tidal marine sediments in replicated, long term chemostat incubations at 10 and 25°C. Whereas denitrification rates at 25°C were more or less stable over time, at 10°C denitrification activ...

Collection of storm water runoff and forcing it into the groundwater is the need of the hour to sustain the ground water table. However, the runoff entraps various types of sediments and other floating objects whose removal are essential to avoid pollution of ground water and blocking of pores of aquifer. However, it requires regular cleaning and maintenance due to problem of clogging. To evalu...