... this model the Osen deposit was selected because it lies directly on a homogeneous granite basement.On the basis of U-Th-Pb whole-rock isotopic analyses for three samples of unweathered basement granite (Trysil granite), a basement age of 1,598 m.y. was established. The lead isotopic compositions of four out...

...Lasse Amundsen; Ørjan Pedersen; Are Osen; Johan O. A. Robertsson; Martin Landrø ABSTRACT The source depth influences the frequency band of seismic data. Due to the source ghost effect, it is advantageous to deploy sources deep to enhance the low-frequency content of seismic data. But, for a given...

...Ying Wang; Adriana Citlali Ramirez; Are Osen ABSTRACT The low-frequency component of seismic data can be beneficial for several reasons: improved signal penetration into the earth, enhanced resolution, and better constrained inversion results. We have developed a detailed analysis of a deghosting...

...Yike Liu; Xuejian Liu; Are Osen; Yu Shao; Hao Hu; Yingcai Zheng ABSTRACT Reverse time migration (RTM) using multiples generates inherent crosstalk artifacts due to the interference among multiples of different orders. We have developed a method to remove such crosstalk. This approach first...

...Hao Hu; Yike Liu; Are Osen; Yingcai Zheng ABSTRACT Because local slant stacking increases the data dimension in beam migration, the volume of local slant stacks can be enormous and can obstruct efficient data processing. In addition, a proper beam compression algorithm can reduce the computation...

...Are Osen; Lasse Amundsen; Arne Reitan Abstract Suppressing the receiver-side sea-surface ghost with its accompanying water-layer reverberations in multicomponent sea-floor data can be performed in both the frequency–wavenumber and the frequency–space domains. Similarly, separation of ocean-bottom...

...Are Osen; Lasse Amundsen; Arne Reitan Abstract A method for suppressing water-layer multiples in multicomponent sea-floor measurements is presented. The multiple suppression technique utilizes the concept of wavefield separation into upgoing and downgoing modes just below the sea floor...

...Are Osen; Bruce G. Secrest; Lasse Amundsen; Arne Reitan Abstract A new and alternative procedure for the deterministic estimation of the seismic source time function (wavelet) is proposed. This paper follows a series of reports on source signature estimation, requiring neither statistical...

... of the Halne fault at Hardangervidda, and in numerous other localities reported elsewhere, such as Røyken ( Spjeldnæs 1955 ), Nordre Osen ( Nystuen 1969 ), Løvbekken in Engerdal ( Skjeseth 1962 b ), Krækkjeheia, Hardangervidda ( Skjeseth & Vokes 1957 ), Vassbo in Dalarna in Sweden ( Tegengren 1962...

... and Sanders (1989) , Amundsen et al. (1995a , 2000a ), Osen et al. (1996 , 1998 , 1999a , b ), Schalkwijk et al. (1997) , and Holvik et al. (1999) . The paper is organized as follows. First, I discuss the motivation for this work. For a horizontally layered medium, it has long been realized...

... root of time to approximate 2D far-field spreading characteristics. Based on studies with synthetic data, we found this widely practiced approach to provide very satisfactory results. This observation is consistent with results reported by Osen et al. (1999a) , who showed that the application of 2D...

...–1 km; Bockelie & Nystuen, 1985 ; Worsley et al. 2011 ). The Osen-Røa Nappe Complex (Lower Allochthon; Fig. 7 ) consists of three hangingwall flats linked by ramps (Morley, 1986 ). The first flat lies in the Alum Shale Formation (S7) overlain by S8 (820 m...

... as the Sparagmites. They became a part of the Caledonian Lower and Middle Allochthons of the Osen–Røa Nappe and Kvitvola Nappe Complexes of southeastern Norway. Provenance study of these dominantly coarse-grained deposits of alluvial and glaciogenic origin has provided evidence for erosion of the Sveconorwegian...

... is constructed to vanish on the air/water boundary and the measurement surface ( Morse and Feshbach [1953] , p. 812ff; Osen et al., 1998 ; Tan, 1999 ; Zhang [2007] , p. 20ff). In the ( r , ω ) domain, Green’s theorem now takes the form P R ′ ( r g ′′ , r s , ω...

... the Osen et al. (1999) formula to obtain the upgoing vertical particle velocity field, i.e., (19) with (20) where χ = ( k x , k y ) represents the wavenumbers for the horizontal coordinates χ = ( x , y ) and where V z ( χ , z r ; ω; x s ) and P ( χ , z r , ω; x s...

... by the mini-streamer to be negligible. Wave-theoretical methods of source signature extraction ( Weglein and Secrest, 1990 ; Osen et al., 1998 ) are more accurate compared to the other existing methods. A significant advantage of these methods is their ability to extract source array patterns...

... analogous to previous work by Wapenaar et al. (1990) for seabed four-component (4C) acquisition. More recently, the theory of elastic decomposition at the sea floor was extended by Osen et al. (1998) , Schalkwijk et al. (1999) , and Amundsen et al. (2000) , resulting in implementations that naturally...

... up- and downgoing wavefields jointly, to perform a complete free-surface demultiple via up-down deconvolution. Wavefield separation ( Barr and Sanders, 1989 ; Soubaras, 1996 ; Schalkwijk et al., 1999 ; Osen et al., 1999 ) using hydrophone (P) and vertical geophone (Z) measurements can...

... and surface-related multiple reflections: Part I — Imaging : Geophysics , 72 , no. 2 , S59 – S69 . Osen A. Amundsen L. Reitan A. , 1999 , Removal of water-layer multiples from multicomponent sea-bottom data : Geophysics , 64 , 838 – 851 . Pica A. Manin M. Granger P...

... of increasingly challenging requirements on the acquisition and processing efforts: MAUDD for 2D media ( Osen and Amundsen, 2001 ); MAUDD for 2.5D media ( Musil and Kostov, 2008 ), and ultimately, implementations for 3D media. When the acquisition geometry is 2D, with sources and receivers along a line...