EMSO / MAREGAMI Marmara bottom pressure and current records
|Author(s)||Henry Pierre1, Özeren Sinan2, Desprez De Gesincourt Olivier3, de Saint-Leger Emmanuel3, Libes Maurice4, Çakir Ziyadin5, Yakupoğlu Nurettin5, Geli Louis6|
|Affiliation(s)||1 : Aix Marseille Univ, CNRS, IRD, INRAE, Coll France, CEREGE, Aix-en-Provence, France
2 : Istanbul Technical University, Eurasia Institute of Earth Sciences, Maslak, Istanbul, Turkey
3 : CNRS, DT INSU, Parc national d’instrumentation océanographique, Plouzané, France
4 : Aix Marseille Univ, OSU Pytheas, Marseille, France
5 : Istanbul Technical University, Geological Engineering Dept., Maslak, Istanbul, Turkey
6 : IFREMER, Centre de Brest, Géosciences Marines, Plouzané, France
EMSO is a European network of seabed and fixed-point water column observatories whose scientific objective is to acquire long time series in the seas around Europe for the study of environmental processes related to interactions between geosphere, biosphere and hydrosphere. MAREGAMI project (MARine Earthquake Gap Assessment and Monitoring for Istanbul) is a bilateral Turkish-French collaborative project coordinated by IFREMER and Istanbul Technical University and funded by ANR and TÜBITAK.
The goal of MAREGAMI was the development of new methods and monitoring strategies to assess earthquake and tsunami risks related to offshore faults, with tasks: (1) Marine geodesy: acquisition and processing of geodetic submarine data, (2) Hydrodynamics and specific depositional processes: water column data acquisition and hydrodynamic modeling, (3) Improving earthquake relocation with ocean bottom instruments, (4) Designing an optimal and sustainable network of submarine sensors.
Data distributed here were acquired for MAREGAMI Task 2. These consist of time series acquired during 4 deployments on the sealfoor perfomed between January 2018 and November 2020 of an instrumented frame holding a RBR bottom pressure recorder (BPR) and a Seaguard recording current meter (RCM) equipped with additional sensors (conductivity, oxygen, tide pressure end temperature). The acquisition and distribution of marine data time series in the Sea of Marmara is funded by EMSO-France Research Infrastructure, EMSO-Link, and MAREGAMI projet. DT-INSU provided operational support and instrumentation.
Data originate from an instrumented frame deployed for durations of about 6 months at different locations at the bottom of the Sea of Marmara deep basins. The instrumentation is autonomous and comprises
(1) a RBR bottom pressure recorder (BPR #52665) with a Paroscientific 0-2000 m Digiquartz sensor (#140758). The RBR pressure sampling interval was set to 5s. The instrument is set in horizontal position 0.70 m above the seafloor.
(2) a Seaguard recording current meter (RCM #155) equipped with doppler current sensor (Z-pulse DCS #146), pressure and temperature sensor (Aandera Tide 5217 #393), conductivity sensor (#788), oxygen sensor (Aandera optode #3127). The Seaguard RCM recording interval was set to 5 minutes (for all sensors) during deployments performed in 2018 and to 1 hour during deployments performed in 2019. The tide sensor is a piezoresistive sensor of accuracy comparable to that of the Digiquartz sensors (0.02% full scale vs 0.01% for Digiquartz), but of lower resolution 0.2 hPa (2 mm). The Z-Pulse sensor is 1.45 m above the seafloor, the tide sensor 1.35 m
The RBR system was acquired with MAREGAMI funding. DT-INSU loaned the Seaguard RCM. The tide sensor fit on the Seaguard RCM was acquired with EMSO funding.