Abnormal concentrations of atmospheric methane over the Sea of Okhotsk during 2015/2016 winter / Methane Hydrates and Plumes in the Sea of Okhotsk / and Worldview: North of Antarctica & south of New Zealand, Greenland, Gulf of St. Lawrence & Anticosti Island, Newfoundland, Sea of Okhotsk, Kamchatka Krai & Sakhalin

North of Antarctica & south of New Zealand    http://go.nasa.gov/2iYIBdv

Newfoundland & Labrador      http://go.nasa.gov/2kbzPpd

Greenland, etc.      http://go.nasa.gov/2iYDDxn

Gulf of St. Lawrence & Anticosti Island, Newfoundland / Jan. 23, 2017

(below) http://go.nasa.gov/2kbAOWt


Abnormal concentrations of atmospheric methane over the Sea of Okhotsk during 2015/2016 winter
L.N. Yurganov 1 , I. Leifer 2
1 University of Maryland, Baltimore County, Baltimore, USA
2 Bubbleology Research International, Santa-Barbara, USA
Accepted: 02.06.2016
DOI: 10.21046/2070-7401-2016-13-3-231-234
The latest data on the concentration of methane over the Sea of Okhotsk, obtained using satellite interferometers IASI-1 and IASI-2 have been presented. During the 2015–2016 autumn-winter season atmospheric methane anomalies amounted 70-100 ppb in comparison with previous years. Maximum observed anomaly was observed over the Deriugin trough to the North-East of Sakhalin Island. In the recent decades, the Sea of Okhotsk was found as an area with prospected reserves of methane hydrates; methane emissions to the atmosphere were observed also. The satellite measurements of anomalies are consistent with the locations of proven methane hydrate deposits. Methane anomaly along the North-West coast of the sea is tentatively explained by methane emitted due to degradation of sub-marine permafrost, similarly to that occurring in the Laptev Sea. A significantly higher interannual variability of methane in the autumn-winter season than that in summer is explained by a transition from stable summer stratification of seawater to unstable one. Also intensification of turbulent diffusion in the sea connected with storms plays a role.

Wednesday, October 2, 2013
Earthquake M6.7 hits Sea of Okhotsk

An earthquake with a magnitude of 6.7 on the Richter scale hit the Sea of Okhotsk on October 1, 2013.

The submarine earthquake occurred at a depth of 359.3 miles (578.24 km). Earthquakes at such a depth can be felt at great distances from the epicenter.

The danger is that tremors will destabilize methane held in sediments underneath the Arctic Ocean.  As above map shows, a fault line connects the Arctic Ocean with the Sea of Okhotsk through Siberia. As above map also shows, a lot of methane is already present over the Arctic on or close to this fault line.

Methane Hydrates and Plumes in the Sea of Okhotsk


Jan.23, 2017 / Sea of Okhotsk & zaliv Shelekhova     http://go.nasa.gov/2kbBD1K

Methane Hydrates and Plumes in the Sea of Okhotsk
Article · March 2009 with 20 Reads

Methane hydrates exist beneath the sea bottom near cold seeps NE off the Sakhalin in the Sea of Okhotsk.  Multidisciplinary field operations were performed at a study area (approximately 16 × 20 km2) to investigate seepage characteristics and understand gas hydrate formation mechanisms. A continuous profiling survey was conducted to obtain a distribution map of seepage structures on the floor by using a deep-tow, side-scan-sonar equipment. The distribution map reveals that the dense area of seepage structures coincides with a sea-floor area of deformed sediments caused possibly by repeated sediment slumping and debris flows in the past.

We speculate that this deformation may have created shallow faults that are suitable to conduits for the migration and discharge of gas and fluid.  Three seepage structures were selected to study about their fluid-seep conditions around the sea floor level. Hieroglyph seepage structure is located at the northern end of the dense area of the structures. Kitami and Chaos structures are located about 2 and 7 km respectively apart from the Hieroglyph structure within the dense area. Large plumes on echograms and higher methane contents in the water column confirm gas seepage activities at the three structures.

There observed at least two and four plumes at the Hieroglyph and Chaos structures, respectively. Each gas chimney image in seismic reflection profiles was traced to connect each BSR and seepage structure. Both pull-up and disturbed structures of BSR around the gas chimney images were interpreted as to be indications of significant heat flows caused by ascending fluid at both Kitami and Chaos structures. On the other hand, almost no pull-up/disturbance of BSR was observed at the Hieroglyph structure, suggesting little water seepage. The seep activity may vary with time off the Sakhalin. The Hieroglyph structure is located at the edge of a dense area of the seepage structures. It might serve as an indicator for the long-term activity of the fluid seepage system off the Sakhalin.



Sea of Okhotsk, Sakhalin, Hokkaido         http://go.nasa.gov/2iPG8Sv

Tatarskiy proliv         http://go.nasa.gov/2hSl24e



Sea of Okhotsk, Kamchatka Krai & Sakhalin   http://go.nasa.gov/2hbeiug

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