Blar i forfatter Artikler, rapporter og annet (geovitenskap) "Ramachandran, Hariharan"
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Impact of Gas Saturation and Gas Column Height at the Base of the Gas Hydrate Stability Zone on Fracturing and Seepage at Vestnesa Ridge, West-Svalbard Margin
Ramachandran, Hariharan; Plaza-Faverola, Andreia; Daigle, Hugh (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-26)The Vestnesa Ridge, located off the west Svalbard margin, is a >60 km long ridge consisting of fine-grained sediments that host a deep-marine gas hydrate and associated seepage system. Geological and geophysical observations indicate the predominance of vertical fluid expulsion through fractures with pockmarks expressed on the seafloor along the entire ridge. However, despite the apparent evidence ... -
Origin and Periodic Behavior of Short Duration Signals Recorded by Seismometers at Vestnesa Ridge, an Active Seepage Site on the West-Svalbard Continental Margin
Domel, Przemyslaw; Singhroha, Sunny; Plaza-Faverola, Andreia; Schlindwein, Vera; Ramachandran, Hariharan; Bünz, Stefan (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-02)Short duration events (SDEs) are reported worldwide from ocean-bottom seismometers (OBSs). Due to their high frequency (4–30 Hz) and short duration, they are commonly attributed to aseismic sources, such as fluid migration related processes from cold seeps, biological signals, or noise. We present the results of a passive seismic experiment that deployed an OBS network for 10-month (October 2015–July ... -
Spatial Changes in Gas Transport and Sediment Stiffness Influenced by Regional Stress: Observations From Piezometer Data Along Vestnesa Ridge, Eastern Fram Strait
Plaza-Faverola, Andreia; Sultan, Nabil; Lucchi, Renata Giulia; El bani Altuna, Naima; Ramachandran, Hariharan; Singhroha, Sunny; Cooke, Frances Ann; Vadakkepuliyambatta, Sunil; Mohamed, Mohamed Mahmoud Ezat Ahmed; Rasmussen, Tine Lander (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-25)Gas transport through sediments to the seabed and seepage occurs via advection through pores, faults, and fractures, and as solubility driven gas diffusion. The pore pressure gradient is a key factor in these processes. Yet, in situ measurements for quantitative studies of fluid dynamics and sediment deformation in deep ocean environments remain scarce. In this study, we integrate piezometer data, ...