{"id":141,"date":"2016-06-28T13:41:14","date_gmt":"2016-06-28T12:41:14","guid":{"rendered":"http:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/?p=141"},"modified":"2016-08-08T14:00:46","modified_gmt":"2016-08-08T13:00:46","slug":"radio-rock-research","status":"publish","type":"post","link":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/2016\/06\/28\/radio-rock-research\/","title":{"rendered":"Radio Rock Research"},"content":{"rendered":"

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Boom.<\/strong> Every 12 seconds. Boom. You can rather feel than hear the deep sound vibrating through the ship. Boom. \u2013 Seismic measurements try to \u2018look\u2019 through the seafloor, into the sediments and rocks. They use deep, very low frequency sound of around 6 Hertz, which is noticeable lower than common electric or acoustic bass drums. Acoustic waves for seismic measurements are typically generated by air guns that are towed behind the ship, and rapidly release compressed air (just like a big, popping air balloon).<\/p>\n

Chirp, chirp.<\/strong> Every 10 seconds. Chirp, chirp. \u2013 The transmitter unit (basically a big speaker) of the multi-beam echo-sounder in the hull of the ship emits sound waves in a frequency of 12 Kilohertz, similar to a high pitch tone, a high chirp. Two sets of sound waves are emitted in slightly different directions to get more information from the seafloor: Chirp, chirp.<\/p>\n

Cheep-cheep-cheep.<\/strong> Down at 3400 m water depth, 100\u00a0m above the seafloor: The autonomous underwater vehicle AUV Abyss<\/a>, alias \u201cTiffy\u201d, pings in a very high frequency of 200 to 400\u00a0kHz, which is ten times higher than what human ears can hear.<\/p>\n

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Like different radio stations, seismic measurements, ships multi-beam, and AUV multi-beam broadcast their information at different frequencies. Depending on what you would like to listen to (rocks at depth, the vast expanses of the seafloor, or detailed, high-resolution bathymetry): tune in!<\/strong><\/p>\n

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\"Airguns

Airguns are towed behind the ship and release air (white bubbles underneath the red buoy) every 12 seconds. The circle of white foam is due to the previous \u201eshot\u201c of air that reached the sea surface. \/ Die Luftkanonen werden hinter dem Schiff geschleppt und entlassen alle 12 Sekunden gepresste Luft (wei\u00dfe Blase unterhalb der roten Boje). Der Ring aus wei\u00dfem Schaum entsteht beim Aufsteigen der Luftblase an die Meeresoberfl\u00e4che. (\u00a9 M. Klischies)<\/p><\/div>\n

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\u00a0—————<\/p>\n

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Bumm.<\/strong> Alle 12 Sekunden. Bumm. Die tiefen Vibrationen lassen das gesamte Schiff erzittern. Und wieder: Bumm. \u2013 Seismische Messungen \u201eblicken\u201c durch den Meeresboden, in die Sedimente und das feste Gestein hinein. Dazu werden sehr tiefe, niedrig-frequente Schallwellen von um die 6 Hertz verwendet, die deutlich tiefer klingen als jeder elektrische oder akustische Bass. Die T\u00f6ne, bzw. Schallwellen werden von Luftkanonen erzeugt, die hinter dem Schiff geschleppt werden und komprimierte Luft explosionsartig entlassen (\u00e4hnlich wie ein zerplatzender Luftballon).<\/p>\n

Zirp, zirp.<\/strong> Alle 10 Sekunden. Zirp, zirp. \u2013 Die Transmitter-Einheit (im Grunde ein Lautsprecher) des F\u00e4cherecholot-Systems im Rumpf des Schiffes sendet Schallwellen mit einer Frequenz von 12 Kilohertz aus, das sich so \u00e4hnlich anh\u00f6rt wie ein sehr hohes Klingeln, oder eben ein sehr hohes Zirpen. Zwei S\u00e4tze an Schallwellen werden dabei in leicht unterschiedliche Richtungen ausgesendet, um noch mehr Informationen vom Meeresboden zu erhalten: Zirp, zirp.<\/p>\n

Fiep-fiep-fiep.<\/strong> Unten, in 3400\u00a0m Wassertiefe bzw. 100\u00a0m \u00fcber dem Meeresboden: Das autonome Unterwasserfahrzeug AUV Abyss<\/a>, auch \u201eTiffy\u201c genannt, pingt in einer Frequenz von 200 bis 400 Kilohertz, was ungef\u00e4hr zehnmal h\u00f6her ist als das menschliche Geh\u00f6r wahrnehmen k\u00f6nnte.<\/p>\n

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Wie unterschiedliche Radioprogramme, so \u00fcbertragen Seismik, Schiffsf\u00e4cherecholot und das F\u00e4cherecholot des AUV ihre Informationen auf verschiedenen Frequenzen. Also je nachdem, was man h\u00f6ren m\u00f6chte (das Gestein aus der Tiefe, die Weiten des Meeresbodens oder detailreiche, hochaufl\u00f6sende Bathymetrie): Schall(t) ein!<\/strong><\/p>\n

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\"AUV

AUV Abyss is ready to get deployed. The underwater robot dives independently from the ships and maps the seafloor at a very high frequency that results in maps with a very high resolution and great amount of detail. \/ AUV Abyss ist bereit zum Aussetzen. Der Unterwasserroboter taucht unabh\u00e4ngig vom Schiff und kartiert den Meeresboden mittels hoch-frequenter Schallwellen. Die daraus resultierenden Karten bestechen mit ihrer sehr hohen Aufl\u00f6sung und gro\u00dfartigem Detailreichtum. (\u00a9 M. Klischies)<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Boom. Every 12 seconds. Boom. You can rather feel than hear the deep sound vibrating through the ship. Boom. \u2013 Seismic measurements try to \u2018look\u2019 through the seafloor, into the sediments and rocks. They use deep, very low frequency sound of around 6 Hertz, which is noticeable lower than common electric or acoustic bass drums. […]<\/p>\n","protected":false},"author":160,"featured_media":144,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-141","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorised"],"_links":{"self":[{"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/posts\/141","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/users\/160"}],"replies":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/comments?post=141"}],"version-history":[{"count":5,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/posts\/141\/revisions"}],"predecessor-version":[{"id":149,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/posts\/141\/revisions\/149"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/media\/144"}],"wp:attachment":[{"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/media?parent=141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/categories?post=141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.oceanblogs.org\/mappingtheoceanfloor\/wp-json\/wp\/v2\/tags?post=141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}