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Futagoyama

Name Alias(es): 
Futagiyama
Vent Sites: 
Waka
Maximum Temperature: 
291
Max Temperature Category: 
Latitude: 
24.8674
Longitude: 
123.3081
Location on map: 
Ocean: 
National Jurisdiction: 
Maximum or Single Reported Depth (mbsl): 
1270
Tectonic setting: 
Full Spreading Rate (mm/a): 
49.0
Volcano Number (if applicable): 
Host Rock: 
NotProvided
Deposit Type: 
NotProvided
Notes on Vent Field Description: 
“Futagoyama” field, located in the southern-Okinawa Trough, in which two sites were detected, named Waka and Taka. Max. 291°C fluid venting was recorded in Waka site, whereas only gas bubbles emitted from the sea-floor were observed visually in Taka site (Makabe A. et al., 2017); In Waka site of Futagoyama field, we could discover hydrothermal field and rich animal colonies at the top of the knoll. In Taka site of Futagoyama field (Southern hill of Futagoyama) we could find no hydrothermal vent, but CO2 bubble emissions were observed. We concluded that this CO2 bubbles were affected as the signatures obtained from MBES and side-scan sonar. In Waka site of Futagoyama field, we could discover hydrothermal field and rich animal colonies at the top of the knoll (Kairei Cruise Report KR16-16, 2016).
Year and How Discovered (if active, visual confirmation is listed first): 
2016 ROV Kaiko dive 717
Discovery References (text): 
Geochemical and biological features of hydrothermal vent fields newly discovered in the Okinawa Trough. Makabe A. et al., https://goldschmidtabstracts.info/2017/2540.pdf (accessed on 2019/01/09);
Kairei Cruise Report KR16-16 Cross-ministerial Strategic Innovation Promotion Program (SIP) Next-Generation Technology for Ocean Resources Exploration; Seeking and Hunting the Hydrothermal Activities in Southern Okinawa Trough; 18th November 2016, Naha – 5th December 2016, Kagoshima; Japan Agency for Marine-Earth Science & Technology (JAMSTEC), http://www.godac.jamstec.go.jp/catalog/data/doc_catalog/media/KR16-16_all.pdf (accessed on: 2019/01/09);