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- Volume 12, Issue 2, 1994
First Break - Volume 12, Issue 2, 1994
Volume 12, Issue 2, 1994
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Thrust-controlled exploration plays in the outer Carpathians and their foreland (Poland, Ukraine and Romania)
Authors E. Lafargue, N. Ellouz and F. RoureThe outer Carpathians constitute an elongated fold-and-thrust belt, largely thrusted north-eastwards over the European and Russia platforms and eastwards to southwards over the Moesian platform and Dobrogean edifice. They stretch from Vienna in the west to the Iron Gate in Romania in the south-east (Fig. 1). The belt can be divided into two segments: an E-W segment in Poland bordered in the south by the Pienniny klippen belt, and a NW-SE to N-S segment in Ukraine and Romania.
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A new decompaction model and its application to the northern North Sea
Authors G. Liu and E. RoaldsetDecompaction may be defined as a process to reconstruct the palaeothickness and the palaeoporosity distributions of a sedimentary column. This process is normally realized by computation of pore volume reduction in sedimentary histories (Perrier and Quiblier 1974). Decompaction modelling has been a subject of interest because of its uses in quantitative geohistory analysis, reservoir evaluation and fluid migration studies in sedimentary basins (Sclater and Christie 1980; Bessis 1985; Bertram and Milton 1989). Petroleum geologists, while preparing palaeogeographic or palaeostructural reconstructions, must consider how thicknesses of strata were modified during depositional history.
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SH-wave generation by a vertical force applied close to a pit
Authors C. Kitsunezaki, T. Yokoi, K. Okuzumi and N. GotoShear-wave seismic surveys are usually carried out with SH waves. We would not normally expect to generate SH waves by applying a vertical force at the free surface because of the axial symmetry. However, during a VSP experiment in 1988, we unexpectedly observed the predominant generation of SH waves. This experience led us to devise experiments for solving its mechanism. We found that the phenomenon was directly connected with low rigidity zones in the ground. A typical case of a low rigidity zone is a pit, whether empty or filled with soft soil. For this reason, we call this phenomenon the pit effect. The radiation characteristics of such pits were also investigated. One possible application of the pit effect is to make use of it as an SH-wave source. A detailed explanation of most aspects of the field experiments described in this paper has been given in recent Japanese papers (Kitsunezaki and Goto 1992; Kitsunezaki and Okuzumi 1992; Kitsunezaki et al, 1992).
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Volumes & issues
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Volume 42 (2024)
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Volume 41 (2023)
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Volume 40 (2022)
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Volume 39 (2021)
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Volume 38 (2020)
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Volume 37 (2019)
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Volume 36 (2018)
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Volume 35 (2017)
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Volume 34 (2016)
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Volume 33 (2015)
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Volume 32 (2014)
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Volume 31 (2013)
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Volume 30 (2012)
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Volume 29 (2011)
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Volume 28 (2010)
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Volume 27 (2009)
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Volume 26 (2008)
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Volume 25 (2007)
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Volume 24 (2006)
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Volume 23 (2005)
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Volume 22 (2004)
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Volume 21 (2003)
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Volume 20 (2002)
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Volume 19 (2001)
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Volume 18 (2000)
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Volume 17 (1999)
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Volume 16 (1998)
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Volume 15 (1997)
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Volume 14 (1996)
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Volume 13 (1995)
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Volume 12 (1994)
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Volume 11 (1993)
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Volume 10 (1992)
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Volume 9 (1991)
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Volume 8 (1990)
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Volume 7 (1989)
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Volume 6 (1988)
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Volume 5 (1987)
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Volume 4 (1986)
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Volume 3 (1985)
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Volume 2 (1984)
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Volume 1 (1983)