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12 Month Report on WP2: Tsunami source characterisation

12 Month Report on WP2: Tsunami source characterisation. Nearest 12 Month Meeting Marrakech, October 25-26, 2007. WP Leader:. Nearest 12 Month Meeting Marrakech, October 25-26, 2007. Starting point.

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12 Month Report on WP2: Tsunami source characterisation

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  1. 12 Month Report on WP2: Tsunami source characterisation Nearest 12 Month Meeting Marrakech, October 25-26, 2007 WP Leader:

  2. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Starting point State of knowledge concerning location, geometry and characteristics of main active, potentially tsunamigenic faults identified in the area based on WP1 tectonic map. Existing data : MCS legacy data acquired in the last ~15 years in the area (especially IAM, Rifano, SISMAR, and SWIM) Objective and starting point Overall objective Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 Characterisation of the tsunami source areas based on definition of the seismic structure to relate earthquake and tectonic structures, specially deep decollement surfaces

  3. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Goals • Mapping deep crustal and upper mantle structure to test geodynamic models; • Determining crustal-scale geometry of main fault surfaces accommodating plate convergence; • Relocating local seismicity that will be recorded in WP3, relate earthquake activity and tectonic strain; • Constraining physical properties of structural domains and tectonic features. Workplan and goals Workplan Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 • Re-process key MCS profiles across most relevant structures until pre-stack depth migration; • Acquire, process and model new WAS data along “some” profiles combining OBS and landstations.

  4. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives • Meetings: • BARTOLOMÉ, R., GRÀCIA, E., RUBIO, E., DAÑOBEITIA, J.J., TERRINHA, P., AND SWIM-2006 CRUISE PARTY, (2006). New multichannel seismic data imaging of the western part of Gulf of Cádiz (SW Iberian Margin): The SWIM-2006 cruise. Third EUROMARGINS Conference, Bologna (Italia), 4-7 October (Poster). • MARTÍNEZ, S., GRÀCIA, E., BARTOLOMÉ, R., TERRINHA, P., BIROUK, A., DAÑOBEITIA, J.J., SALLARÈS, V., and SWIM-06 CRUISE PARTY (2007). Tectonics of the Coral Patch Ridge area and adjacent Horseshoe and Seine Abyssal Plains (Gulf of Cadiz) based on new multichannel seismic data. 1st Moroccan Association of Petroleum Geologists Conference, Marrakech (Morocco), 28-31 October. • Staff: • A graduate student (Sara Martínez) hired @CSIC to realize a PhD thesis on SWIM MCS/Nearest WAS data • A graduate student (Sergi Ventosa) hired @CSIC to develop signal processing filters adapted to WAS data • A post-doc will be hired @UBO to work with Nearest MCS/WAS data (?) Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3

  5. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Task 2.1 Reprocessing and pre-stack depth migration of existing MCS data Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 CSIC personnel: E. Gràcia, S. Martínez R. Bartolomé, V. Sallarès 2006 Kickoff Meeting: Pre-selected key profiles from IAM, Rifano, SISMAR, SWIM to be (re-)processed until PSDM

  6. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Task 2.1 Activities Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 • CSIC concentrated on SWIM-06 data acquired in June 2006 • (PI E. Gràcia). RB, SM have pre-processed 16 profiles • SM focused on • SW08-SW16 across the • Coral Patch Ridge and • active structures of Seine • and Horseshoe Abyssal • plains • RB focused on • SW01-SW07 crossing the • Horseshoe fault to the • accretionary wedge and • lineation 1 SWIM-2006 Survey

  7. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 Task 2.1 Activities • 4 profiles have been selected for • PSDM : SW2, SW7, SW13, SW16 • This is being done now in • Geomar within EU-LSF program

  8. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 Task 2.1 Activities • Université de Bretagne Occidentale (UBO) : • Providing a database of processed and time-migrated • MCS lines of Sismar and DelSis surveys. • Three were PSDM (Sis-4, Sis-16 and Sis-22) • Providing HR (Chirp) data from the DelSis survey ; • Acquire and provide new HR (sparker) data on the SW • Spanish and NW Moroccan platforms (July-Aug 2007, • NOMADS cruise, PI P. Leroy) Other?

  9. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 WP3 Task 2.1 Barchart D4 : Prestack depth-migrated MCS profiles Ok for CSIC on SWIM

  10. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Task 2.2 Wide-angle reflection/refraction acquisition experiment Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 CSIC personnel: E. Gràcia, S. Martínez, S.Ventosa, R. Bartolomé, V. Sallarès • Application for R/V • Hesperides and funding from • Spanish agencies for a WAS • cruise sent in August 2006 • Acquisition of three ~200 km WAS lines with ~25 OBS • Application granted in • November 2006 and dates • confirmed in May 2007 • 18 days: between Oct 16th and Nov 2nd, 2008 Nearest-Seis 2008 Survey

  11. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Getting OBS? Task 2.2 Activities Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 WP3 • Application for 20 Geomar OBS • (60 deployments) sent to EU-LSF in May 2007 • Failed : money runout • Bid to acquire Spanish OBS pool started in February 2007 • Ok : 17 Scripps L-Cheapo SP OBS should beready (?) by June 2008 • UBO applied for UBO/Ifremer OBS • Ok : 7 UBO + 17 Ifremer MicrOBS reserved for Nearest-Seis… Nearest-Seis 2008 Survey But… budget for insurance, shipping, technicians is lacking!

  12. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Getting OBS? Task 2.2 Activities Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 • Possibility of renting Geomar (or GeoPro) OBS explored • 20 OBS/60 deploy cost ~120 k€ • Possibility for sharing rental expenses with Geomar explored • Add scientific value to Nearest: go into FWT in one profile (?) Nearest-Seis 2008 Survey • Other (ex. FCUL)?

  13. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 Task 2.2 Barchart D5 : Cruise report M3 : End of processing and experiments at sea

  14. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Progress towards objectives Task 2.3 Processing, modelling and interpretation of wide-angle seismic data Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 Activity Sergi Ventosa developed two filters (polarization and lateral coherency-based) to enhance S/N in WAS data Barchart D6: Velocity and density models M4: End of OBS modelling

  15. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Planning Year 2 Activitiy summary table Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3

  16. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 Planning Year 2 Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 • Critical aspects : • Selection of PSDM profiles must be closed. CSIC > SWIM, • UBO > SISMAR. What about Rifano and IAM? • We must ensure having enough OBS to perform the • experiment (minimum 20; ideal 40). • Preferable not having many different types > • logistical complications, limited spacing • WAS profiles must be selected • Possible obstacles : • Not having (enough) OBS. • Poor acquisition results (weather conditions, other...) • Special notes : • We propose to organize the next (18 month) meeting next • May in Barcelona to discuss about cruise planning

  17. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 WP3 CSIC WP3 Activities Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 • Meeting with TopoIberia team leader J. Gallart (CSIC-Barcelona), who is deploying a BB network in SW Iberia • Sharing data recorded by BB OBS (Nearest) and landstation (TopoIberia)networks?

  18. Nearest 12 Month Meeting Marrakech, October 25-26, 2007 WP3 CSIC WP3 Activities Objective Workplan Progress General Task 2.1 Task 2.2 Task 2.3 Planning Y2 WP3 • Participated in MVSEIS MCS survey with 4.5 km streamer of L’Atalante (IP L. Somoza) in September 2007 to ensure shooting over BB network • Not allowed to go North from 36º!

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