8 May, 2015 – Seminar
When: 11am on Friday May 8th, 2015
Where: DIAS Merrion Square Library
Speaker: Dr. Luisa Valoroso and Dr. Lauro Chiaraluce from INGV-National Earthquake Center, Rome, Italy.
Title: Fault architecture and mechanics investigated with high-resolution earthquake locations: from seismic sequences to near fault observatories.
Description: A key feature to investigate earthquake mechanics is the detailed description and characterisation of fault zone structure and kinematics. In 15 years, by improving the available datasets and earthquake location techniques, we have upgraded the resolution of our observing system by more than one order of magnitude. We progressed from the reconstruction of the geometry of the main fault segments at the kilometre scale (e.g. Colfiorito fault, 1997), to the identification and description of secondary structures tens of meters long (e.g. L’Aquila fault, 2009). Currently fault anatomy retrieved by seismicity distribution finally resembles the degree of complexity observed by field geologists on fault outcrops, showing multiple fault splays, bend and cross fault intersections, dilatation jogs and horsetail structures. We observe seismological damage zones characterized by the same thickness and fracture (e.g. earthquakes) density decay, similar to the geological ones. The availability of very large and high-resolution earthquake location catalogues also allows for the investigation of seismicity pattern evolution and fault permeability basing on robust statistical approaches. Therefore only high-resolution data can help in this ambitious challenge of describing and modelling the multi-scale processes which control the faulting phenomena and seismicity evolution. At the same time, we are aware that we need data produced through a multidisciplinary approach. That is why for the past ten years there has been a worldwide commitment to identify Natural Laboratories where state of the art observational systems are installed. There are three main requirements for these areas: must have a reasonably small extension, there must be active faults on it and it must have a regular occurrence of earthquakes.
The area we selected is in Italy is located along the Northern Apennines where the existence of a very low angle normal fault (dip 15°), named Alto Tiberina fault is documented. There, we built a geophysical network (The Alto Tiberina Neat Fault Observatory, TABOO; http://taboo.rm.ingv.it/), composed by tens of co-located seismic and geodetic stations. The extraordinary minimum detection network capability (around ML -0.2) in an area characterised by a very high background seismic rate (r=7.30e−04 eqks/day*km2), allows us to consider a low-magnitude event as a local mainshock. We will present TABOO preliminary results and how we intend to enhance our Near Fault Observatory to create a multi-sensor network able to broaden the range of monitored parameters potentially related to the earthquake preparatory and nucleation phase.
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Last Updated: 22nd March 2016 by Anna
2015-05-08 – Seminar: Dr. Luisa Valoroso and Dr. Lauro Chiaraluce
8 May, 2015 – Seminar
When: 11am on Friday May 8th, 2015
Where: DIAS Merrion Square Library
Speaker: Dr. Luisa Valoroso and Dr. Lauro Chiaraluce from INGV-National Earthquake Center, Rome, Italy.
Title: Fault architecture and mechanics investigated with high-resolution earthquake locations: from seismic sequences to near fault observatories.
Description: A key feature to investigate earthquake mechanics is the detailed description and characterisation of fault zone structure and kinematics. In 15 years, by improving the available datasets and earthquake location techniques, we have upgraded the resolution of our observing system by more than one order of magnitude. We progressed from the reconstruction of the geometry of the main fault segments at the kilometre scale (e.g. Colfiorito fault, 1997), to the identification and description of secondary structures tens of meters long (e.g. L’Aquila fault, 2009). Currently fault anatomy retrieved by seismicity distribution finally resembles the degree of complexity observed by field geologists on fault outcrops, showing multiple fault splays, bend and cross fault intersections, dilatation jogs and horsetail structures. We observe seismological damage zones characterized by the same thickness and fracture (e.g. earthquakes) density decay, similar to the geological ones. The availability of very large and high-resolution earthquake location catalogues also allows for the investigation of seismicity pattern evolution and fault permeability basing on robust statistical approaches. Therefore only high-resolution data can help in this ambitious challenge of describing and modelling the multi-scale processes which control the faulting phenomena and seismicity evolution. At the same time, we are aware that we need data produced through a multidisciplinary approach. That is why for the past ten years there has been a worldwide commitment to identify Natural Laboratories where state of the art observational systems are installed. There are three main requirements for these areas: must have a reasonably small extension, there must be active faults on it and it must have a regular occurrence of earthquakes.
The area we selected is in Italy is located along the Northern Apennines where the existence of a very low angle normal fault (dip 15°), named Alto Tiberina fault is documented. There, we built a geophysical network (The Alto Tiberina Neat Fault Observatory, TABOO; http://taboo.rm.ingv.it/), composed by tens of co-located seismic and geodetic stations. The extraordinary minimum detection network capability (around ML -0.2) in an area characterised by a very high background seismic rate (r=7.30e−04 eqks/day*km2), allows us to consider a low-magnitude event as a local mainshock. We will present TABOO preliminary results and how we intend to enhance our Near Fault Observatory to create a multi-sensor network able to broaden the range of monitored parameters potentially related to the earthquake preparatory and nucleation phase.
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.