Deutsches Ozeanographisches
Datenzentrum Inventur der Poseidon-Reise POS480 (DOD-Ref-No.20150063)
Inventory of Poseidon Cruise POS480 (DOD-Ref-No.20150063)

Plattform
Platform
Reise-Nr.
Cruise-No.
Zeitraum
Period
Projekt
Project
Arbeitsgebiet
Working area
Poseidon POS480 05.02.2015 - 12.02.2015   North Atlantic Ocean  

Fahrtleiter
Chief Scientist
Institut
Institute
Auslaufhafen
Port of departure
Einlaufhafen
Port of return
Stationskarte
Station map
Schiffsroute
Trackchart
Lange Dietrich GEOMAR Helmholtz-Zentrum fur Ozeanforschung Kiel Las Palmas Las Palmas   

Ziel der Reise / Objectives of Cruise:

Objctives of cruise POS480 The ongoing unrest of el Hierro Islands started in 2011 with a submarine volcanic eruption 2 km South of El Hierro and poses a significant hazard potential for the island and its inhabitants. The spatial distribution of seismicity is highly variable and a significant part of is occurs outside the network or offshore. In order to better characterize the seismicity the seismological network is densied with 8 ocean bottom seismometers (OBS) and 9 onshore stations. Beside a better depth estimate of the seismicity OBS data will allow a better characterization of the seismic signals due to an improved spatial coverage of the Island and its surrounding. The offshore supplement of the network will enable a much more improved hypocentral estimate, which in turn will allow to resolve the structures involved in the current seismic unrest as well as its spatial temporal characterization. OBS stations will be deintalled early 2016. Swath bathymetry mapping of the 2011 eruption site was planned to reveal bathymetriy changes related to the growth of the new volcanic cone offshore the southern tip of ElHierro's coast. Additionally, we planned to use the multibeam system to monitor for upwelling gas flares in the watercolumn. Narrative of cruise POS480 Poseidon left the harbour of Las Palmas de Gran Canaria, Spain on Thursday Febuary 5, 2015 at 09:18 local time which equals the UTC time zone. Weather conditions during the ~160 nm transit to lHierro were reasonable good. On February 6 at 08:00 Poseidon arrived at the northeastern side of ElHierro where a releaser test was conducted at water depths of 1000 m. All releasers, incuding the spare releaser, opened after the first release code signal. Due to restrictions oft in the diplomatic clearance which prohibited Multibeam measurement we decided to install the OBS stations first sailing anticlockwise around the island. On February 6 we installed the first OBS station (OBS2) and continue the same day with OBS1 and OBS8. The state of sea was very calm during the whole time until the end oft the cruise in Las Palmas. On February 7 we installed further 4 stations (OBS7, OBS6, OBS5 and OBS4). Finally the last station (OBS3) was installed on February 8 at 08:00. Therefore the ship took a waiting position from Sonday 8 in the morning until Februar 10 waiting for diplomatic clearance on our request if the diplomatic clearance is meant to exclude multibeam mapping of El Hierro's volcanic eruption site of 2011. On February 10 Poseidon left from ElHierro at 18:17 to the transit of ESTOC station which is a mooring station operated by PLOCAN (Telde de Gran Canaria) which has ceased data transmission December 22, 2014. Poseidon arrived at 14:20 at the mooring station ESTOC during optimal weather conditions (1 meter of swell, wind 3 Bft, visibility 15 nm). Poseidon executed search patterns in the vicinity oft he given position oft he buoy with radar surveillance and optical search of the adjacent area. However, the ESTOC stations could not be located at it's mooring position. Theafter Poseidon headed towards Las Palmas de Gran Canaria, reaching the Portuguese port in the evening of February 21, 2015. At 21:00 Poseidon was fixed at pier in Las Palmas.

Messungen / Measurements

Institut
Institute
Wissenschaftler
Scientist
Anzahl
Number
Einheit
Unit
Typ der Messungen
Type of measurements
Kommentar
Comments
Daten im DOD
Data in DOD

Verankerungen / Moorings

Institut
Institute
Wissenschaftler
Scientist
Typ der Messungen
Type of measurements
Kommentar
Comments
geogr.Breite
Latitude
geogr.Länge
Longitude
Daten im DOD
Data in DOD
GEOMAH Lange Dietrich G72 OBS1 - deinstallation early 2016 27° 53.1' N 17° 53.4' W no
GEOMAH Lange Dietrich G72 OBS2 - deinstallation early 2016 27° 44.8' N 17° 50.5' W no
GEOMAH Lange Dietrich G72 OBS3 - deinstallation early 2016 27° 33.3' N 17° 51.4' W no
GEOMAH Lange Dietrich G72 OBS4 - deinstallation early 2016 27° 32.4' N 17° 57.7' W no
GEOMAH Lange Dietrich G72 OBS5 - deinstallation early 2016 27° 34.2' N 18° 13.7' W no
GEOMAH Lange Dietrich G72 OBS6 - deinstallation early 2016 27° 40.1' N 18° 14.8' W no
GEOMAH Lange Dietrich G72 OBS7 - deinstallation early 2016 27° 50.0' N 18° 14.8' W no
GEOMAH Lange Dietrich G72 OBS8 - deinstallation early 2016 27° 53.2' N 18° 9.5' W no
16.11.2019