29 March, 2012 – Seminar
When: 4pm on Thursday, March 29th, 2012
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Professor Andrew Curtis from the School of GeoSciences, University of Edinburgh
Title: The Extraordinary Theory of Seismic Interferometry.
Abstract:
The field of Seismic Interferometry exploded onto the earthquake and industrial seismological scene within the past eight years. It allows seismic tomography of the Earth’s subsurface to be performed using only background vibrational noise (with no identifiable sources of energy), seismometers to be turned into virtual (imagined) sources of energy that produce real seismograms, and I will show that real energy sources (e.g., earthquakes) can be turned into virtual seismometers deep inside the solid Earth (without the need for invasive drilling) – that is, we can use one earthquake as a seismometer to record seismograms from another earthquake.
I will also show how interferometry provides novel schemas for computational wavefield modelling using a wide variety of standard methods (finite difference, finite element, etc.), and provides an industrial solution for direct and scattered ground roll removal in reflection seismology.
Our most recent advances have shown how interferometry provides generalised, nonlinear methods to form images of the Earth’s interior, and that interferometry embodies completely new Optical Theorems of Physics. What is more, we can now record earthquakes on seismometers that were only installed (perhaps years) after the earthquake occurred. Bizarre, but true; and it’s very new.
I will provide a clear explanation for a general Geoscience audience of what interferometry is, how it works, and (most of) the advances listed above.
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Last Updated: 22nd March 2016 by Anna
2012-03-29 – Seminar: Prof. Andrew Curtis
29 March, 2012 – Seminar
When: 4pm on Thursday, March 29th, 2012
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Professor Andrew Curtis from the School of GeoSciences, University of Edinburgh
Title: The Extraordinary Theory of Seismic Interferometry.
Abstract:
The field of Seismic Interferometry exploded onto the earthquake and industrial seismological scene within the past eight years. It allows seismic tomography of the Earth’s subsurface to be performed using only background vibrational noise (with no identifiable sources of energy), seismometers to be turned into virtual (imagined) sources of energy that produce real seismograms, and I will show that real energy sources (e.g., earthquakes) can be turned into virtual seismometers deep inside the solid Earth (without the need for invasive drilling) – that is, we can use one earthquake as a seismometer to record seismograms from another earthquake.
I will also show how interferometry provides novel schemas for computational wavefield modelling using a wide variety of standard methods (finite difference, finite element, etc.), and provides an industrial solution for direct and scattered ground roll removal in reflection seismology.
Our most recent advances have shown how interferometry provides generalised, nonlinear methods to form images of the Earth’s interior, and that interferometry embodies completely new Optical Theorems of Physics. What is more, we can now record earthquakes on seismometers that were only installed (perhaps years) after the earthquake occurred. Bizarre, but true; and it’s very new.
I will provide a clear explanation for a general Geoscience audience of what interferometry is, how it works, and (most of) the advances listed above.
Category: Geophysics Section News & Events
Happy Birthday! twitter.com/thecelticist/s…
The papers were 1) Affine Field Theory: conservation identitites and relation to Weyl and Eddington 2)The Union of the three fundamental fields (Gravitation, Menson, Electromagnetism) Which went on to secure worldwide acclaim. #DIASdiscovers
Date: 01 December 1943 Paper: The Irish Press Headline: Two Papers by Dr. Schroedinger Synopsis: 1943 was a busy year for Schroedinger. Not only did he deliver the "What is Life?" Lectures in @tcddublin in February in November he delivered two papers in the @RIAdawson (1/2)
Available to buy on the DIAS bookshop: books.dias.ie/index.php?main… (5/5) #DIASdiscovers #celtic #studies #twopatricks
"In the lives of St. Patrick, the two saints are invariably fused into one", said Prof. O'Rahilly in his lecture. The lecture was a condensation from O’Rahilly’s book “The two Patricks: a lecture on the history of Christianity in fifth-century Ireland”. (4/5)
He was known by his first name Patricius, which in later times would lead to confusion as he was succeeded by another apostle of the same name (Saint Patrick or Patricius in Latin). (3/5)
He spoke on "Palladius and Patrick". Palladius was the first bishop of the Christians of Ireland. (2/5)
Date: 21st March 1942 Paper: The Irish Press Headline: Palladius and Patrick | School Of Celtic Studies Lecture Synopsis: The first public lecture under the auspices of the School of Celtic Studies was delivered in Trinity College by Professor T. F. O'Rahilly in 1942. (1/5)
As part of our ongoing participation in the @HistFest we decided to take a look into the Irish Newspaper Archives and see where DIAS made it into print over the last 80 years. There were so many articles, the hardest part was selecting what we would post. We hope you enjoy!
@AReillyFailte @CultureNight @VisitDublin Thanks Antoinette! Glad you enjoyed 😊
Big thank you to @MartinaPQuinn of @helloalicepr for moderating the discussion, and of course to our panel @NeasaMcG @CormacORafferty and @laoneill111
@CormacORafferty "to cut yourself off from fundamental research means you could miss out on some of the biggest ideas"
@laoneill "it's our job as researchers to keep reminding governments how important basic research is" "For Dev basic research being carried out in Ireland was a badge of pride"
@NeasaMcG Schrödinger's work in causality was not well received by the religious authorities at the time At the same time DIAS did have Catholic priests working on research projects in the early days, so there was not the conflict you might think between science and religion
@laoneill111 Schrödinger was very popular in social circles in Dublin, a bit of a renaissance man
@CormacORafferty Schrödinger was gifted at explaining difficult concepts
@CormacORafferty on how unsuccessful work, in Schrödinger's case, unified field theory, is just as important part of science. And no one has managed to crack it yet! And not forgetting the cat
@laoneill111 how Schrödinger's book inspired scientists to change fields and result in the finding of the double helix.