David Waltham

From Sand Grains to Solar Systems

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Free Software

Introduction

This page provides links to a variety of software resources that, I hope, will be useful in Geology, Geophysics and Astrobiology.

School Seismology Programme

The British Geological Survey’s schools’ seismology project is a programme to put affordable but effective earthquake detectors into schools across the country. My school seismology page contains a powerpoint presentation showing what the system can do and a computer exercise illustrating use of the associated software (no seismometer necessary).

My Software

I have developed a range of JavaScript-based programs for performing various modelling and analysis tasks in Geology and Geophysics. Using Javascript means that the resulting apps work equally well on PCs, Macs, Tablets or even Smart-Phones provided they are using modern browsers. If you experience problems with the appearance, try upgrading your browser. Currently available programs perform:

Milankovitch: Calculation of ancient Milankovitch cycle periods and their uncertainties.

Anthropogenic Climate Change: Test the hypotheses that humans are the cause of rising carbon-dioxide in the atmosphere and that this, in turn, explains rising temperatures.

DeltaModelling: Forward modelling of deltas to illustrate the effects of changing sea-level and sediment supply on the resulting stratigraphy.

HangingWall: Forward modelling of Hangingwall Deformation (deformation of strata during movement on faults).

ReservoirFlowModel: Forward modelling of hydrocarbon flow through the subsurface. Program demonstrates the effects of faults, channels and impermeable beds as well as the consequences of “upscaling”.

ShotRecordSimulator: Forward modelling of the acquisition of a Marine Seismic Shot Record.  Program demonstrates the different events detected, the effects of ghosts and the influence of subsurface properties.

VelocityAnalysis: A program to illustrate the velocity analysis of a CMP gather. Program shows the effects of NMO/Stacking and allows the user to pick the best velocity and mute parameters.

All programs are released under a creative-commons Attribution-NoDerivatives licence. Further programs will be added to this list as they become available.