Bollettino di Geofisica Teorica e Applicata
OGS Website
About the Journal
Contacts
To Authors
On-line Submission
Subscriptions
Forthcoming
On-line First
The Historical First Issue
Issues

2022 Vol. 63
1 / 2 / 3 / 4

2021 Vol. 62
1 / 2 / 3 / 4 / Suppl. 1 / Suppl. 2 / Suppl. 3

2020 Vol. 61
1 / 2 / 3 / 4 / Suppl. 1

2019 Vol. 60
1 / 2 / 3 / 4 / Suppl. 1 / Suppl. 2 / Suppl. 3

2018 Vol. 59
1 / 2 / 3 / 4 / Suppl. 1

2017 Vol. 58
1 / 2 / 3 / 4

2016 Vol. 57
1 / 2 / 3 / 4 / Suppl. 1

2015 Vol. 56
1 / 2 / 3 / 4

2014 Vol. 55
1 / 2 / 3 / 4

2013 Vol. 54
1 / 2 / 3 / 4 / Suppl. 1 / Suppl. 2

2012 Vol. 53
1 / 2 / 3 / 4

2011 Vol. 52
1 / 2 / 3 / 4 / Suppl. 1

2010 Vol. 51
1 / 2-3 / 4 / Suppl. 1

2009 Vol. 50
1 / 2 / 3 / 4

2008 Vol. 49
1 / 2 / 3-4 / Suppl. 1

2007 Vol. 48
1 / 2 / 3 / 4

2006 Vol. 47
1-2 / 3 / 4

2005 Vol. 46
1 / 2-3 / 4

2004 Vol. 45
1-2 / 3 / 4 / Suppl. 1 / Suppl. 2

2003 Vol. 44
1 / 2 / 3-4

2002 Vol. 43
1-2 / 3-4

2001 Vol. 42
1-2 / 3-4

2000 Vol. 41
1 / 2 / 3-4

1999 Vol. 40
1 / 2 / 3-4

1998 Vol. 39
1 / 2 / 3 / 4

1997 Vol. 38
1-2 / 3-4

1995 Vol. 37
145 / 146 / 147 / 148 / Suppl. 1

1994 Vol. 36
141-144 / Suppl. 1

1993 Vol. 35
137-138 / 139 / 140

1992 Vol. 34
133 / 134-135 / 136

1991 Vol. 33
129 / 130-131 / 132

 
 

Vol. 34, n.133, March 1992
pp. 3 - 19

Two dimensional seismic modelling by finite element legendre polynomial condensation technique

S. K. Nath , S. Majumdar and S. Sengupta

Abstract

A two dimensional forward modelling algorithm allowing anisotropy in density and wave propagation velocity for any geological model solves the wave equation by using the Finite Element Method. The condensation of global matrices is achieved by introducing hierarchical modes in the form of Legendre Polynomials. This does not only reduce the memory requirements and overall computational time to a great extent but also enables one to develop algorithms which are suitable for either multiple processors or mini- computers. The algorithm was successfully applied to simulate both the normal incidence and shot profile seismograms on several geological models by using an expansion of ten polynomials. Usually the harmonic modes associated with the deformation being simple, the simulation could have been done by using lower order polynomials. But the real earth models posses more complex modes and hence an allowance for higher order polynomials is kept in the program. A convergence test is also carried out both in space and time. The results presented in this paper indicate the efficiency and accuracy achieved by this method and its feasibility in computing synthetic seismograms for complex geological structures.

Download PDF complete



back to table of contents