− We can obtain the performance of the marine seismometer upon the sediment to know its coupling in the bottom sea. This paper deals with the coupling parameters in order to obtain the geophone response through the frequency. The use of the shake table and vibration calibrator allows to deduce the coupling transfer function between the geophone and the sediment sea without using a detailed mode...

We report evidences of active seabed doming and gas discharge few kilometers offshore from the Naples harbor (Italy). Pockmarks, mounds, and craters characterize the seabed. These morphologies represent the top of shallow crustal structures including pagodas, faults and folds affecting the present-day seabed. They record upraise, pressurization, and release of He and CO2 from mantle melts and d...

Deep waters (c. 4200m) around the Crozet Islands have localised and isolated seabed communities on sediments lying beneath highly productive waters to the north and east of the Islands. The restricted areas of primary productivity are stimulated by natural iron fertilization from the volcanic islands, in an otherwise low productivity HNLC (High Nutrient Low Chlorophyll) region, characteristic o...

The authors present a novel procedure for the automated rectification of side-scan sonar images. The traditional assumption of a flat seabed for the computation of the ground projection from the slant-range sonar data can later result in difficult geo-referencing and registration problems. Accurate rectification using actual seabed topography is required for precise integration of side-scan ima...

In deepwater-drilling engineering, it is necessary to disconnect the bottom equipment of lower marine-riser package from blowout preventer when encountering multi-hazard environmental factors. order reduce impact recoil on drilling platform after sudden disconnection riser, in this paper, an optimal guaranteed cost H∞ control problem considered for riser. First, a three-element mass-damper-spri...

Abstract One of the most serious incidents that can occur in offshore drilling and exploration is damage to well structure subsea components which result uncontrolled hydrocarbon release environment present a safety hazard rig personnel. Over decades, there have been substantial developments mathematical models algorithms used analyze stresses on related define operational integrity windows ope...