Geological Strain Analysis. My Ph.D. thesis combined field work in the south of Ireland and theoretical continuum mechanics research. Continuing interest in this area has lead to 20 reviewed contributions, including the following 10 most important papers:

De Paor, D.G. 1983. Orthographic analysis of geologic structures ç Part I. Deformation theory. Journal of Structural Geology 5: 255-277.

De Paor, D.G. & Means, W.D. 1984. Mohr circles of the First and Second Kind and their use to represent tensor operations. Journal of Structural Geology 6: 693-701.

Collins, D.A. & De Paor, D.G. 1986. A determination of the bulk rotational deformation resulting from displacements in discrete shear zones in the Hercynian fold belt of South Ireland. Journal of Structural Geology 8: 101-109.

De Paor, D.G. 1988. Rf/ff strain analysis using an orientation net. Journal of Structural Geology 10: 323-333.

De Paor, D.G. 1988. Strain determination from three known stretches ç an exact solution. Journal of Structural Geology 10: 639-642.

De Paor, D.G. 1990. Determination of the triaxial strain ellipsoid from sectional data. Journal of Structural Geology 12: 131-137.

De Paor, D.G. 1990. The theory of shear stress and shear strain on planes inclined to the principal directions. Journal of Structural Geology 12: 923-927.

De Paor, D.G. 1994. The role of asymmetry in the formation of structures. Journal of Structural Geology 16: 1331- 1333.

De Paor, D.G. 1994. Modeling displacement and deformation in a single matrix operation. Journal of Structural Geology 16: 1033-1037

De Paor, D.G. 1994. A parametric representation of ellipses and ellipsoids. Journal of Structural Geology 16: 1331-1333.

I'm currently writing a paper on stress analysis.

Computer-Aided Analysis and Visualization of Geological Structures.

My recent work has been directed towards the construction of temporal maps, along with the use of Bézier functions for modeling geologic structures, and the development of quaternion methods for interpolation of orientation data.

Top ten publications in this category:

De Paor, D.G. 1987. Stretch in shear zones: implications for section balancing. Journal of Structural Geology 9: 893-895.

De Paor, D.G. & Bradley, D.C. 1988. Balanced Sections in Thrust Belts - Part II. Computerized Section Balancing. Geobyte 3: 33-37.

De Paor, D.G. 1989. An interactive program for doing Fry strain analysis on the Macintosh microcomputer. Journal of Geological Education 37: 171-180.

De Paor, D.G. 1990. Cross-section balancing in space and time. in: Petroleum and Tectonics in Mobile Belts (J. Letouzey, Ed.) Editions Technips, Paris, pp.149-154.

De Paor, D.G. 1991. Computer-aided pole-figure construction. Computers & Geosciences 17: 973-983.

De Paor, D.G. & Simpson, C. 1996. Visualization of basic structural geometries. in: De Paor, D.G. (Ed.), Structural Geology and Personal Computers. Pergamon Press, New York, 51-56.

Simpson, C. & De Paor, D.G. 1996. Computer-aided understanding of deformation structures in: De Paor, D.G. (Ed.), Structural Geology and Personal Computers. Pergamon Press, New York, 97-104.

De Paor, D.G. 1996. Bézier curves and geological design. in: De Paor, D.G. (Ed.), Structural Geology and Personal Computers. Pergamon Press, New York, 389-420.

De Paor, D.G. 1996. Computation of orientation for GIS – the ‘Roll’ of quaternions. in: De Paor, D.G. (Ed.), Structural Geology and Personal Computers. Pergamon Press, New York, 447-456.

De Paor, D.G. 1996. Bitmap rotation, raster shear, and block diagram construction. in: De Paor, D.G. (Ed.), Structural Geology and Personal Computers. Pergamon Press, New York, 499-512.

I'm currently writing new web-based strain analysis applications.

Integration of Strain, Kinematic, and Surface Process Studies in Thrust Belts.

I am interested in quantitative study of thrusting and mountain building. P.D.F. Dwight Bradley, graduate students Gloria Eisenstadt and Stephen Phillips, and I spent six-weeks on Ellesmere Island, Canada, and documented a pivotal orogeny - the Eurekan. Graduate student Dave Anastasio and I discovered that thrust sheets in the Spanish Pyrenees moved over the synorogenic surface like glaciers, advancing and retreating in response to the balance of tectonic forces and climate change. Other field projects included studies with students Eric Beam, Celia Kohn, Gulzar Aziz, Robert Gower, and Tim Kusky in Maryland, Pennsylvania, and the Northwest Territories of Canada, and, recent collaboration with Prof. Carol Simpson in the Scandinavian Caledonides, Nova Scotia, and Argentinian Andes.

Ten papers from these field studies follow:

De Paor, D.G. & Anastasio, D. 1987. The Spanish External Sierra: a case study in the advance and retreat of mountains. National Geographic Research 3: 199-209.

Eisenstadt, G. E. & De Paor, D.G. 1987. An alternative model of thrust-fault initiation and propagation. Geology 15: 630-633.

De Paor, D.G., Bradley, D.C., Eisenstadt G.E., and Phillips, S.M. 1989. The Arctic Eurekan Orogen – a most unusual fold and thrust belt. Geological Society of America Bulletin 101: 952-967.

De Paor, D.G., Simpson, C., Bailey, C.M., McCaffrey, K.J.W., Beam, E., Gower, R.J.W. & Aziz, G. 1991. The role of solution in the formation of boudinage and transverse veins in carbonates at Rheems, Pennsylvania. Geological Society of America Bulletin 103: 1552-1563.

De Paor, D.G. & Kusky, T. 1991. Sedimentary versus tectonic fabrics in metamorphic rocks: evidence from the Point Lake area, Slave Province, North West Territories. Geological Society of America Bulletin 103: 486-503.

De Paor, D.G. 1992. Temporal maps of advancing and retreating thrust sheets, Spanish Pyrenees. in: S. Mitra and G. W. Fisher (eds.) Structural Geology of Fold-and-Thrust Belts (The Elliott Volume), Johns Hopkins University Press, 45-52.

Simpson, C. & De Paor, D.G. 1993. Deformation and Kinematics of High Strain Zones. Journal of Structural Geology 15: 1-20.

Bailey, C.M. , Simpson, C. & De Paor, D.G. 1994. Diffusional mass transfer and crystal plasticity in the deformation of granitic rocks of the Blue Ridge Thrust Sheet, S.W. Virginia. Journal of Structural Geology 16: 1403-1416.

Simpson, C. & De Paor, D.G. 1997. Practical analysis of general shear zones using the porphyroclast hyperbolic distribution method: an example from the Scandinavian Caledonides. in: Sengupta, S. (Ed.), Evolution of Geologic Structures from Micro- to Macro-Scales, Chapman & Hall, London. p. 169-184

Simpson, C., Whitmeyer, S., De Paor, D. G., Gromet, L. P., Miro, R., Krol, M. A. & Short, H. 2001 Sequential ductile through brittle reactivation of major fault zones along the accretionary margin of Gondwana in Central Argentina in: Special Publication of the Geological Society: The Nature and Tectonic Significance of Fault Zone Weakening, (eds. R. Holdsworth et al.), Special Publication of the Geological Society of London 186, 233-255.

I'm planning to publish a temporal map for the Central Andes.

Internet Resources and Electronic Publications

By 1988, my computer programs were in such demand that I set up a formal distribution process and in 1995, I transferred all distribution to the Internet. Most of my electronic publications were not subject to peer review because no such process existed at the time. However, over 200 universities on 5 continents have licensed my software.

Ten selected electronic contributions (‹ = peer-reviewed):

De Paor, D.G. 1988. Structure Lab v.1.2. Computer courseware. Distributed on disk by Earth’nWare Inc., MD.

De Paor, D.G., 1993. Intro and Advanced Structure Software Bundles. 21 programs with explanatory notes. Distributed on disk by Earth’nWare Inc., MD.

De Paor, D.G. & Simpson, C. 1994. Field Geology and Microstructure Software Bundle. Courseware with explanatory notes. Distributed by Earth’nWare Inc. MD. 16 programs and atlas of 100 photos each.

De Paor, D.G. 1998. Physical Geology and Geophysics Bundles. Courseware with explanatory notes. Distributed on disk by ScienceProf.com. 21 computer programs.

‹De Paor, D.G., 1999. Splash – a guide to creating splash screens. Real Basic Monthly. http: //www.nd.edu/ ~jvanderk/rbm/ 4-99/ Splash_screen_article.html

De Paor, D.G., 2000. Interactive Flash Animations. On-line resources for the geosciences and physical sciences. Distributed by download from the Internet.. http://www.ScienceProf.com/index.html.

De Paor, D.G., 2001. Structural Analysis. An on-line course and CD ROM, produced by ScienceProf.com. http: //www.bu.edu/ es/ 301/ index.html

‹De Paor, D.G., 2001. New Interactive Animations for Analysis of Stress, Strain, and Flow. Journal of the Virtual Explorer. vol. 3. ISSN 1441-8126. http: //www.virtualexplorer.com.au/ VEjournal/ Volume_3/ index.html

‹De Paor, D.G. 2001. Animations and Simulations on CD ROM in "Earth: Portrait of a Planet" by Stephen Marshak. W. W. Norton. 650 pp.

Marscher, A. P., De Paor, D.G., Mohr, S. C., Whitaker, J.S., 2003. From Nothing to Everything: The Evolution of the Universe and the Earth. Pearson Custom Publishing, 262 pp.

My current interests include development of a markup language for the geosciences.

Temporal Maps and the Evolution of Structures, Baltimore, MD, 1990

Scientific Politics of Global Warming Theory, Montgomery Co., MD, 1990

Global Warming Theory and Public Policy, Baltimore, MD, 1990

Analysis of Heterogeneous Strain and Displacement in Geological Cross Sections Using Bézier Functions, Dallas, TX, 1990

Design Elements and Geological Cross Sections, London, UK, 1990

A Short Course in Cross Section Restoration, Dallas, TX, 1991

Development of the Central Andes, Dallas, TX, 1991

The Formation of Hammer-head Veins, MD, 1991

Microcomputer Applications in Structural Geology, MD, 1991

Computer Aided Design of Geological Maps and Cross Sections, MD, 1991

Morphology & Kinematics of Active Thrust Fronts, San Diego, 1991

Short Course: Deformation and Kinematics of High Strain Zones*, San Diego, 1991

Short Course: Temporal Mapping, Mendoza, Argentina, 1991

Temporal Maps, Buenos Aires, 1991

Evidence for Pressure Solution as an Important Deformation Mechanism in Greenschist Grade Mylonites*, Zurich, Switzerland, 1991

Strain, Fabric and Volume Change Analysis of Contractional and Extensional Mylonites *, San Diego, 1991

Role of Extensional Strain and Pressure Solution in Formation of Veins, Rheems, PA*, San Diego, 1991

Interaction of Tectonics and Climate in the Central Andes, Cornell Univ., NY, 1991

Strain and Displacement Studies in Mylonites, Cornell Univ., NY, 1991

Oblique Inversion Tectonics, Mendoza, Argentina, 1992, Dallas, TX, 1992

Short Course: Deformation and Kinematics of High Strain Zones*, Salta, Argentina, 1992

Stress Analysis Using the Macintosh Microcomputer, The Hague, Netherlands, 1992

Computer Applications in Strain Analysis (Penrose Keynote Address), Nova Scotia, Canada, 1992

Strain and Kinematic Analysis in General Shear Zones*, Cincinnati, OH, 1992

Exhibition of Microcomputer Programs, Cincinnati, OH, 1992

Style of extension in the North Atlantic ocean basin as revealed from reflection seismic data.*, Cincinnati OH 1992

Short Course: New Directions in Structural Geology*, Denver CO, 1993

Exhibition of Microcomputer Programs , Boston MA, 1993

Closed system formation of Calcite Veining During Low Grade Metamorphism at Rheems Quarry, PA*, Boston MA, 1993

Short Course: Getting Maximum Information from Deformed Rocks*, Blacksburg VA, 1994

The Oualline Endowed Lecturer (week-long 5-lecture series), Austin TX, 1995

Reinventing the Geological Map, Barcelona, Spain, 1995

Practical Analysis of General Shear Zones from the Scandinavian Caledonides New Orleans LA, 1995

Computer-aided Geological Mapping, New Orleans LA, 1995

Computer-aided Geological Mapping, Boston College, MA, 1996

Reinventing the Geological Map, University of Natal-Durban, S. Africa, 1996

Short Course: Strain and Kinematic Analysis*, University of Witwatersrand, Johannesburg, 1996

Citationist for the Career Contribution Award, GSA, Denver CO, 1996

The Microcomputer Revolution and the Earth Sciences (Inaugural Lecture of the Joly Society), Dublin Ireland, 1996

Short Course: Geological Courseware Development, Bryn Mawr, PA, 1997

Microcomputer Methods and the Earth Sciences, Albany NY, 1997

Modern Structural Mapping, Boston University, MA, 1997

Transpaction in the Meguma Group Rocks During the Emplacement of the South Mountain Batholith, Nova Scotia*, Nova Scotia, Canada, 1998

Transpaction in the Meguma Group Rocks During the Emplacement of the South Mountain Batholith, Nova Scotia*, AGU, Baltimore MD, 1998

Tectonic Markup Language - An Idea Whose Time has Come. Geological Society of American Annual Meeting, Montreal, Canada. Prog. & Abstr. 1999

Information Technology and the Earth Sciences. Burlington VT, Oct 2000.

Coastal Ecology of Hull (Field Trip), Boston MA, May 2001.

Re-evaluation of the Role of Classical Stress Theory in Tectonics. Boston, May 2001.

Geology of the Avalon Terrane, Straits Pond Area (Field Trip), Boston MA 2001

"Donut" Diagrams for Stress, Strain, and Kinematic Analysis in Deformed Rocks. Geological Society of American Annual Meeting, Boston, MA. Prog. & Abstr. 2001

An atomic-scale approach to the analysis of stress and strength in rocks; implications for brittle and ductile strain and for crustal-scale discontinuities. Invited keynote address, GSA Penrose Conference, Monte Verita, 2002.

Use of Macromedia Flash for Lecture Presentations and Virtual Labs. Teaching Technology Expo, Boston University. 2002

Multimedia in Earth Science Education - Creation, Use and Limitations. Special session in honor of John Butler (invited speaker), GSA Denver. 2002

Environmental Geology of Straits Pond (Field Trip), Boston MA 2003

Environmental Geology of Straits Pond (Local TV Presentation), Boston MA 2003