1. NEAREST Meeting 8-9 May, 2008 - Barcelona NEARESTWP4 Leader: INGV INGV Team: Laura Beranzoli, Davide Embriaco, Paolo Favali, Francesco Frugoni, Marco Lagalante, Nadia Lo Bue, Giuditta Marinaro, Stephen Monna, Claudio Viezzoli

2. Summary General on WP4 and WP Tasks Status of the activity (last 6 months) and major outcomes Draft planning of the activity for next period (next 6 months)

3. Objectives The WP is aimed at carrying out geophysical and oceanographic measurements on the seafloor and in the water column in the nearby of near-shore tsunamigenic sources for the identifications of tsunami signals. The seafloor and water column measurements will be performed by means of a deep seafloor multiparameter observatory of GEOSTAR type, developed in previous EC projects and will be transmitted to shore in real-time (some essential parameters). WP4 - Tsunami signal detection General

4. Task 4.1 Definition of sensor requirements and sensor selection; requirements of the detection software (e.g., detection algorithm, triggering threshold, messages). Task 4.2 Design and development of modifications (e.g., sensor supports of the frame); design and development of the software. Task 4.3 Integration of new sensors/devices and new software in the seafloor observatory, tests of the functionality in laboratory. Task 4.4 Preparation planning and implementation of a long-term (about 1 year) mission; cruises for deployment and recovery. Task 4.5 Data back-up, quality checks, preparation of the data base to be integrated with other data; pre-analysis of ‘parent’ tsunami signals. General COMPLETED IN PROGRESS

5. Experiment overview Acoustic transmission Satellite Link GEOSTAR MODUS Task 4.1 Buoy

6. GEOSTAR includes a prototype of tsunameter developed by ISMAR and INGV The tsunameter is based on three coupled sensors: – a three comp. broad –band seismometer –an accelerometer –an absolute pressure gauge An automatic software detects seismic event on-set and pressure signal on-set independently and provides correction for the GEOSTAR frame motion and for the tide.

7. ISMAR-BO. FFCUL, CSIC  marine site selection and characterisation for the pilot experimenton the basis of the knowledge of the area ISMAR-BO  cruises responsible AWI, UGR, IM  requirements of sensor sampling rates TFH  MODUS for the pilot experiment (deployment/recovery) INGV  Seafloor observatory (GEOSTAR) ISMAR BO FFCULCSICAWIUBOINGVTFHUGRIMCNRSTXISTOS H H M M Leader H H M Partners involved WP4 General

8. D10definition of sensors’, software requirements for the deep-sea platform D11detailed design for the integration of new sensors and device in the deep-sea platform D12integration of new sensors, test of functionality of the deep-sea platform D13deployment procedure for the deep-sea platform D14deployment cruise of the deep-sea platform and cruise report D15a recovery cruise of the deep-sea platform and data quality checks D15bcruise report WP4 Deliverables m 4 m 8 m 11 m 12 m 24 General

9. in October we were able to query GEOSTAR status and download some data.in October we were able to query GEOSTAR status and download some data. The number of events recorder by the observatory revealed a good working of the event detecting system for the period September: no anomalous reboots of the central unit, some tenth of seismic events, good state of acoustic battery level.The number of events recorder by the observatory revealed a good working of the event detecting system for the period September: no anomalous reboots of the central unit, some tenth of seismic events, good state of acoustic battery level. GEOSTAR observatory is presently working autonomously storing all sensor data on board.GEOSTAR observatory is presently working autonomously storing all sensor data on board. All data will be obtained after the observatory recoveryAll data will be obtained after the observatory recovery Present status of GEOSTAR

10. Mission – experiment running with deviations from original planningMission – experiment running with deviations from original planning Periodical checks – extraordinary check on the buoy site (October ‘07)Periodical checks – extraordinary check on the buoy site (October ‘07) Buoy mooring failure (October ‘07)Buoy mooring failure (October ‘07) Status of the activities (m 18) (task 4.3)

11. Deviations - 1 Bouy Acoustic communications malfunctioning: immediately after the GEOSTAR deployment Remedial action: the acoustic modem and the electronics of the buoy were removed and shipped to laboratory in order to set up again the communication chain. The system was restored and re-configured. On 17 October a new cruise took place in order to rebuild the communication on the buoy.

12. Deviations - 2 After the setup of the buoy electronics and the reconfiguration of GEOSTAR via acoustic communications (17 October 07), the acoustic system of the abyssal observatory hang up revealing a problem of the seafloor acoustic modem. Remedial action: Contacts with the acoustic communication supplier (SERCEL) started soon in order to programme an upgrade of the modem communication system to a new and more stable release of the hardware and software configuration to be used in the next deployment.

13. Acoustic surface communication from on-board configuration file correctly received by GEOSTAR- 17 October 2007

14. The configuration file uploaded on GEOSTAR - 17 October 2007

15. Deviations – 3 October 2007 Buoy drift and ARGOS alarms emission to INGV (19 October) Extraordinary cruise for the buoy recovery (19-22 October) Buoy mooring cut and mooring cable at sea

16. Buoy failure and recovery Real time position tracking from GPS data via satellite link (19-20 October 07) Till 18.10.07

17. Buoy recovery in the warehouse Faro - November 2007…. Meteo station and satellite antennas Electronics and battery pack The cable

18. Buoy recovery in the warehouse Faro - November 2007…. Dismounting and storage operations

19. mooring line is likely to be on the seafloor (the cut was just under the floating body)mooring line is likely to be on the seafloor (the cut was just under the floating body) Last November, during the mission of AWI in the deployment area, the acoustic release on the seafloor was checked successfully by means of a surface pinger unit.Last November, during the mission of AWI in the deployment area, the acoustic release on the seafloor was checked successfully by means of a surface pinger unit. The mooring line will be recovered during the GEOSTAR recovery cruise next August with R/VThe mooring line will be recovered during the GEOSTAR recovery cruise next August with R/VUrania Status of the mooring line

20. Revision of the activity planning (draft) The events occurred (acoustic instability, buoy drift) call for a revision of the WP4 activity according to the available resources. In order to find additional resources, a proposal for an experiment (Demonstration Mission) was presented within ESONET NoE (EC project running): LIDO- LIstening to Deep Ocean (CSIC, FFCUL, INGV, ISMAR partners). APPROVED !!

21. Revision of the activity planning (draft) Proposal: after the recovery planned in next August, GEOSTAR will be refurbished and newly deployed (temptative time: spring 2009) for a new mission in order to fulfil the original project objectives. New Deployment: R/V Sarmiento de Gamboa

22. Time schedule General Present status of the activities (m 18 ) Task 4.4 Experiment Task 4.5 data back-up planned actual

23. GEOSTAR recovery (August r/v Urania)GEOSTAR recovery (August r/v Urania) Recovery of the buoy mooringRecovery of the buoy mooring Restoration of the buoy and new deployment (next year)Restoration of the buoy and new deployment (next year) Integration of seismic data in the marine data-base of the OBS data (WP3 – seismological monitoring) (task 4.5)Integration of seismic data in the marine data-base of the OBS data (WP3 – seismological monitoring) (task 4.5) Work for the next period (draft)