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A variety of sensors monitored morphological, hydrological, geochemical, and biological parameters in the HMMV area. An ocean bottom seismometer deployment allowed us to register seismic motion for 2 years, from October 2008 to October 2010. The analysis of seismic records documents two types of seismic signals. The first type are harmonic tremors with frequency peaks around 4\u20135 and 8\u201310 Hz that occur in swarms. Their origin could be from fluid flow circulation or resonant vibrations of gas bubbles or from delayed movement of fluid\u2010rich sediments in the conduit or in a deeper pseudo\u2010mud chamber of the HMMV. Because swarms occur with a periodicity of\u2009~\u20096 h, tide\u2010related effects are suspected to influence the mechanism originating the tremors. The second type of signals are regional earthquakes that were in 15 cases recognized in seismic records. The activity of harmonic tremors was not significantly affected by earthquakes.<\/jats:p>","DOI":"10.1002\/2014jb010990","type":"journal-article","created":{"date-parts":[[2014,7,9]],"date-time":"2014-07-09T15:09:18Z","timestamp":1404918558000},"page":"6159-6177","source":"Crossref","is-referenced-by-count":30,"title":["Character of seismic motion at a location of a gas hydrate\u2010bearing mud volcano on the SW Barents Sea margin"],"prefix":"10.1029","volume":"119","author":[{"given":"Peter","family":"Franek","sequence":"first","affiliation":[{"name":"CAGE\u2014Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology UiT The Arctic University of Norway  Troms\u00f8 Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"J\u00fcrgen","family":"Mienert","sequence":"additional","affiliation":[{"name":"CAGE\u2014Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology UiT The Arctic University of Norway  Troms\u00f8 Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Stefan","family":"Buenz","sequence":"additional","affiliation":[{"name":"CAGE\u2014Centre for Arctic Gas Hydrate, Environment and Climate, Department of Geology UiT The Arctic University of Norway  Troms\u00f8 Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Louis","family":"G\u00e9li","sequence":"additional","affiliation":[{"name":"Marine Geosciences Department Ifremer  Plouzan\u00e9 France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"13","published-online":{"date-parts":[[2014,8,14]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.epsl.2013.06.032"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.5194\/nhess\u201012\u20103617\u20102012"},{"key":"e_1_2_8_4_1","first-page":"497","article-title":"Spectrogram analysis of selected tremor signals using short\u2010time Fourier transform and continuous wavelet transform","volume":"42","author":"Bartosch T.","year":"1999","journal-title":"Ann. 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