8 March 2013 – Seminar
When: 4pm on Friday, 8 March 2013
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Prof. Kerry Gallagher (University of Rennes, France)
Title: Transdimensional (Inverse) Modelling in Earth Sciences
Abstract:
In many modelling problems in Earth Science, the number of parameters is fixed in advance. While suitable for deterministic forward modelling, this can be limiting for inverse modelling. In this case, arguments can be used to bound the maximum number of parameters that need to be considered or the number of unknowns is set at some arbitrary value. Ideally we would like to treat the number of unknowns itself directly as an unknown. This leads to a transdimensional problem, that is, one where the dimension of the parameter space is a variable to be solved for. I will present a brief overview of an approach used to solve such problems, and illustrate its application to a range of Earth Science problems such as the inference of past climate from geochemical data in boreholes, construction of seismic tomography models, and the decomposition of geochronological data to identify mixture components.
Leave a Comment
Last Updated: 22nd March 2016 by Louise Collins
2013-03-08 – Seminar: Kerry Gallagher
8 March 2013 – Seminar
When: 4pm on Friday, 8 March 2013
Where: DIAS, Geophysics Section, 5 Merrion Square, Dublin 2, (library)
Speaker: Prof. Kerry Gallagher (University of Rennes, France)
Title: Transdimensional (Inverse) Modelling in Earth Sciences
Abstract:
In many modelling problems in Earth Science, the number of parameters is fixed in advance. While suitable for deterministic forward modelling, this can be limiting for inverse modelling. In this case, arguments can be used to bound the maximum number of parameters that need to be considered or the number of unknowns is set at some arbitrary value. Ideally we would like to treat the number of unknowns itself directly as an unknown. This leads to a transdimensional problem, that is, one where the dimension of the parameter space is a variable to be solved for. I will present a brief overview of an approach used to solve such problems, and illustrate its application to a range of Earth Science problems such as the inference of past climate from geochemical data in boreholes, construction of seismic tomography models, and the decomposition of geochronological data to identify mixture components.
Category: Geophysics Section News & Events
Meet the Judges of our "Reach for the Stars" Astrophotography competition! @petertgallagher is Head of @DIASAstronomy & has spent the past two decades studying the Sun its impacts on the Earth. To learn more and submit an entry see dias.ie/reachforthesta… #DIASdiscovers
She has over 15 years’ experience working in PR and communications and has wide-ranging experience of providing strategic communications support to organisations. Learn more about the competition and submit an entry 👉dias.ie/reachforthesta… #DIASdiscovers #astrophotography
Meet the Judges of our "Reach for the Stars" Astrophotography competition! @MartinaPQuinn is the Founder & Managing Director of @helloalicepr.
Want to learn more about what's happening on Mars? Check out our public lecture from November delivered Dr John Clinton and titled MarsQuakes! (5/5) youtu.be/_Lp0oLJ8Ahs
And then this Thursday @NASAMars Perseverance rover reaches Mars, which will try to land in a near equatorial crater called Jezero. Here you can see a possible route around the crater. (4/5)
Last Wednesday, the day the UAE revealed their first image of Mars, China's National Space Administration's Tianwen-1 arrived at Mars. This carries a rover which will be despatched to the surface in the coming months. (3/5) bbc.com/news/science-e…
First up is the @uaespaceagency's Hope mission entered orbit this day last week. It is the first inter-planetary mission by the UAE, and will stay in a wide orbit for one Martian year or two earth years to study climate and weather. (2/5)
It's a busy month over at our planetary neighbour Mars. Three missions headed there have or will enter orbit this month. Why so many at one time? They were timed to launch when the distance between the Earth and Mars was relatively short. (1/5)
#WomeninResearch
Looking for some #MondayMotivation? We are delighted to share this short video by @CClearych who is the O'Donovan Scholar at the School of Celtic Studies. Here she describes the amazing inputs of Eleanor Knott MRIA. youtu.be/Zfvw0KZbFTk @SCSLibrary @RIAdawson
Another addition to this DIAS managed online resource twitter.com/DIAS_ISOS/stat…