Geophysical data acquisition - OGS

More documents

Recommendations

Info

ODP Leg 178 - Site Location Site 1095 Porosity (g/cm 3 ) A B Site 1095 Line 195-135A Site 1095 NW SE mbsf TWT time (s) interval velocity (m/s) C D A) Location map of ODP Sites 1095, 1096, and 1101 (highlighted), together with all other sites drilled during ODP Leg 178. B) Comparison between the downhole logging (APLC, APS Near/Array limestone porosity corrected) porosity (red curve ) and porosity from the index properties (IP) measurements in the laboratory. C) Comparison among interval velocities obtained with the in situ velocity check shots (VSP), stacking velocities and core log velocity. D) Vertical Seismic Profile and tie in two way travel times between lithostratigraphic and seismostratigraphic units. 41
Orbitally-Controlled rhythmic sedimentation in the Wild Drift, Antarctica (ODP Leg 188, Site 1165) M. REBESCO This research, conducted in collaboration with J. Gruetzner (Bremen University, Germany) is an outcome of the participation of an <strong>OGS</strong> researcher (Michele Rebesco) to the ODP Leg 188 in Prydz Bay – Cooperation Sea (Antarctica). Leg 188 cruise began in Fremantle (Australia) on 10 January 2000 and ended in Hobart (Australia) on 11 March 2000. Three sites were drilled on continental shelf, slope and rise to document onset and fluctuations of East-Antarctic glaciations. Site 1165 is situated in a water depth of 3357m on the continental rise in front of the outlet of the Lambert glacier-Amery Ice Shelf system that today drains 22% of East Antarctica. The site cored a 999-m lower Miocene-Holocene section into an elongate sediment body (Wild Drift) formed by the interaction of westward-flowing currents with the sediment supplied from the shelf. Alternations with wavelengths ranging from cm to m size between a greenish grey diatom bearing clay facies and dark grey clay facies with silt laminations are apparent throughout the hole back to early Miocene time. Furthermore the greenish intervals are characterised by lower density, susceptibility and iron content. The dark grey intervals are interpreted as contouritic facies deposited during maximum ice advances whereas the greenish sediments indicate hemipelagic sedimentation under warmer climate conditions. Analysis of high resolution colour photo-spectrometer <strong>data</strong> reveals that the colour cycles are best described by the ratio of the reflectivity in the green colour band and the average reflectivity (grey). Spectral analyses on depth and time series of the investigated parameters over selected intervals demonstrate that variance is dominated by orbital frequencies as predicted by the Milankovitch theory. The detected obliquity and precession cycles allow a refined evaluation of sedimentation rates. Subsidence at the Cape Roberts drill sites (Ross Sea, Antarctica) from backstripping techniques L. DE SANTIS G. BRANCOLINI The tectonic subsidence of the western margin of the Victoria Land basin has been estimated from the physical properties and ages of the sediments in the Cape Roberts Project drill cores 2/2A and 3, using backstripping techniques, assuming a local isostatic compensation. The sediment load effects is removed from the total subsidence and the tectonic contribution through time at each location is calculated. The analysis indicates a total tectonic subsidence of about 660 m at this location between 34 Ma and the present time. Two main trends are defined, i) about 230 m/m.y. from 34 Ma to 32.5 Ma, and ii) about 23 m/m.y. from 32.5 Ma to 21 Ma. Since 21 Ma, the subsidence is not well constrained. Extrapolation indicates a very low subsidence rate, but uplift within this period may have greatly affected the estimate. 42
Page 2 and 3: Istituto Nazionale di Oceanografia
Page 4: Contents Introduction . . . . . . .
Page 7 and 8: Sea, close to the Antarctic Peninsu
Page 10 and 11: Measurements while drilling (data a
Page 12 and 13: Vallazza research well: 3D-RVSP sei
Page 14 and 15: Therefore, having beside a high ele
Page 16 and 17: • Standard 20’ container modifi
Page 18 and 19: • Offshore gravimetric survey “
Page 20 and 21: The GPR instruments. Integrated met
Page 22 and 23: Seismic data processing Coordinator
Page 24 and 25: allow for the different spatial sam
Page 26 and 27: Results of application of the stati
Page 28 and 29: Measurements while drilling (R & D)
Page 30 and 31: Wave modeling Coordinator: Géza SE
Page 32 and 33: Phase velocities of the five wave m
Page 34 and 35: (SPEM) and the Wavenumber Integrati
Page 36 and 37: The Marche Microzonation Project is
Page 38 and 39: Seismic inversion Coordinator: Aldo
Page 40 and 41: The joint inversion of direct, refl
Page 42 and 43: Transferring technology from the oi
Page 44 and 45: At the end of the year, we started
Page 48 and 49: Core 1165B-14H Composite diagram sh
Page 50 and 51: Cenozoic Evolution of the South Ork
Page 52 and 53: Magallanes-Fagnano master fault TWT
Page 54 and 55: (Top): Structural map of the BSRs o
Page 56 and 57: Physical properties of sediment cor
Page 58 and 59: Bathymetric map of the North Atlant
Page 60 and 61: Synthetic Aperture Radar (SAR) remo
Page 62 and 63: Publications Wave modeling ARNTSEN,
Page 64 and 65: Seismic inversion ROSSI, G., AND VE
Page 66 and 67: TINIVELLA, U. AND LODOLO, E., 2000.
Page 68 and 69: POLETTO, F., LOVO, M., AND CARCIONE
Page 70 and 71: REBESCO, M., CITA, M.B., HIEKE, W.,
Page 72 and 73: Visitors Peter F. BARKER, British A
Page 74 and 75: About Trieste, Italy Overwiew Tries
Page 76 and 77: Near Trieste One cannot miss a visi

Geophysical data acquisition - OGS

Create successful ePaper yourself

Delete template?

Save as template?