DIAS Geophysics has collected and continues to manage terrestrial gravity data In Ireland.
Since the establishment of the Geophysics Section, gravity measurements were taken at over 23,000 stations (Thirlaway 1951, Murphy 1952, 1974; , O’Reilly et al., 1996, Readman et al., 1997). The data coverage shown averages at about 4.2 stations per 10 km square, equivalent to an average spacing of about 1.55 km. The measurements have usually been made at or near to Ordnance Survey of Ireland bench marks or spot heights, and terrain corrections (rarely greater than 0.5 mGal) have been made where necessary. To view gravity station locations click here.
The overall accuracy is estimated to be about 0.2 mGal. The variation in the thickness of the overburden cover leads to uncertainty in calculating the Bouguer anomaly that in extreme cases can be up to 1.5 mGal for peat bog. The magnitude of the effect is rarely known so for simplicity the data reduction procedure in calculating the Bouguer anomaly has assumed a constant density of 2670 kg m -3 above sea-level datum.
Commercial data licence fee
€0.30 per point (for one year licence) + €250 licensing fee and €250 data preparation fee.
Multi-year licences are possible up to a maximum of 5-years, with approximately 50% reduction for each successive year so a 2 year licence is €0.45 per point, 3 year licence is €0.525 per point, 4 year licence is €0.5625 per point, and a 5 year licence is €0.60 per point.
For further details and price quotations contact geosecretary-at-cp.dias.ie. To view the agreement letter please click here.
Academic use
The gravity data can be made freely available to academic users upon request.
Murphy, T. 1952. – Measurements of gravity in Ireland: Gravity survey of Central Ireland. Geophysical Memoirs, Dublin Institute for Advanced Studies, No. 2, part 2.
Murphy, T. 1974. – Gravity Anomaly Map of Ireland. Communications of the Dublin Institute for Advanced Studies, Series D, Geophysical Bulletin No. 32.
O’Reilly, B.M., Readman, P.W. & Murphy, T. 1996. The gravity signature of Caledonian and Variscan tectonics in Ireland. Physics and Chemistry of the Earth 21, 299-304.
Readman, P.W., O’Reilly, B.M. & Murphy, T. 1997. Gravity gradients and upper crustal tectonic fabrics, Ireland. Journal of the Geological Society, London 154, 817-828.
Thirlaway, H.I.S. 1951. – Measurements of gravity in Ireland: Gravimeter observations between Dublin, Sligo, Galway and Cork. Geophysical Memoirs, Dublin Institute for Advanced Studies Ireland, No. 2, part 3.
La Soufriere volcano raised to alert level Red
St. Augustine, Trinidad and Tobago, W.I. – 6:30pm April 8th, 2021 - Scientists have observed a significant increase in activity at La Soufriere volcano which has prompted The Government of SVG to raise the volcanic alert level 1/7 Retweeted by
DIAS Geophysics
Which mechanisms drive the triggering of volcanic unrest? What role does changes in volcanic materials play? Novel ground motion measurements can help answer these questions. And so can you, in a @SPIN_itn PhD project at @dias_geophysics! Apply now: spin-itn.eu/esr41Retweeted by
DIAS Geophysics
1942
Dr. Sheila Tinney of Galway
Pioneering Irish mathematical physicist. Aged 23 she earned her PhD under future Nobel prize winner Max Born on "Stability in Crystals"
Image credit: Tinney Family, Mathematics Ireland
#Science#Ireland#Galway#History#Quantum .@DIAS_DublinRetweeted by
DIAS Geophysics
Our 1st speaker of the April 8th #ShakeMeetup is @seismotom!
Thomas Lecocq is a #Seismologist at the Royal Observatory of Belgium who created the open source code to study the global decrease in seismic noise due to the past lockdown.
➡️ buff.ly/3vXYS4nRetweeted by
DIAS Geophysics
This is 1 year ago. That idea, on April Fools' Day... Less than 4 month later, the 76-author article was published online! What a year, damn 2020. The worst and the best! Science, our way! Sharing knowledge, codes, data... is THE way. I'm a f* open-scientist! Thanks to you all!❤ twitter.com/seismotom/stat…Retweeted by
DIAS Geophysics
How is Tomorrow's Cities working to engage different stakeholders? How has the Covid-19 pandemic impacted our ability to engage? And what are we learning about what works and what doesn’t? Read this blog to see our MEL team's analysis: tomorrowscities.org/stakeholder-en…
📸@SIAS_SouthasiaRetweeted by
DIAS Geophysics
1933, Erwin Schrödinger
Austrian-Irish physicist
Éamon de Valera (himself a mathematician!) personally persuaded Schrödinger to join the Dublin Institute for Advanced Studies in 1939.
Image: Nobel foundation, Wikimedia Commons #physicist#Clontarf#dublinireland#DeOldifyRetweeted by
DIAS Geophysics
1942 @DIAS_Dublin
First row from left:
Sheila Tinney, Pádraig de Brún, Paul Dirac, Éamon de Valera, Arthur Conway, Arthur Eddington, Erwin Schrödinger, Albert Joseph McConnell.
Image: DIAS, Wikicommons
#Ireland#Dublin#Science#HistoryRetweeted by
DIAS Geophysics
Time to get out your camera or phone, and look up to the heavens and see what you can capture 📸
Closing date for the @DIAS_Dublin Reach for the Stars competition is 2nd April.
alicepr.com/featured/final…Retweeted by
DIAS Geophysics
Activity is gradually increasing at #Etna's Southeast Crater, building up toward the 16th paroxysmal eruptive episode in little more than five weeks. Loud detonations audible in the southern sector of the volcano. View is from home in Tremestieri Etneo Retweeted by
DIAS Geophysics
Blue regions are at the lower limit and show quiescent periods. Red regions are at the high limit and signify active periods.
#DIASdiscovers#WorldMetDay
Links can be seen between wave height and seismic amplitudes.
Below are wave heights from Met Eireann's M6 buoy, seismic displacement from a seismometer in western Donegal (12km from the coast) and a spectrogram of the seismic data from April 2012.
#WorldMetDay#OceanScience
We are collaborators with @MetEireann and @DIASAstronomy in 'Space Weather' research and we are recording natural magnetic and electric field variations in County Kerry to assist this exciting research.
#DIASdiscovers#worldmetday
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Gravity Data
DIAS Geophysics has collected and continues to manage terrestrial gravity data In Ireland.
Since the establishment of the Geophysics Section, gravity measurements were taken at over 23,000 stations (Thirlaway 1951, Murphy 1952, 1974; , O’Reilly et al., 1996, Readman et al., 1997). The data coverage shown averages at about 4.2 stations per 10 km square, equivalent to an average spacing of about 1.55 km. The measurements have usually been made at or near to Ordnance Survey of Ireland bench marks or spot heights, and terrain corrections (rarely greater than 0.5 mGal) have been made where necessary. To view gravity station locations click here.
The overall accuracy is estimated to be about 0.2 mGal. The variation in the thickness of the overburden cover leads to uncertainty in calculating the Bouguer anomaly that in extreme cases can be up to 1.5 mGal for peat bog. The magnitude of the effect is rarely known so for simplicity the data reduction procedure in calculating the Bouguer anomaly has assumed a constant density of 2670 kg m -3 above sea-level datum.
Commercial data licence fee
€0.30 per point (for one year licence) + €250 licensing fee and €250 data preparation fee.
Multi-year licences are possible up to a maximum of 5-years, with approximately 50% reduction for each successive year so a 2 year licence is €0.45 per point, 3 year licence is €0.525 per point, 4 year licence is €0.5625 per point, and a 5 year licence is €0.60 per point.
For further details and price quotations contact geosecretary-at-cp.dias.ie. To view the agreement letter please click here.
Academic use
The gravity data can be made freely available to academic users upon request.
For further details contact geosecretary-at-cp.dias.ie. To view the agreement letter please click here.
Publication References
Murphy, T. 1952. – Measurements of gravity in Ireland: Gravity survey of Central Ireland. Geophysical Memoirs, Dublin Institute for Advanced Studies, No. 2, part 2.
Murphy, T. 1974. – Gravity Anomaly Map of Ireland. Communications of the Dublin Institute for Advanced Studies, Series D, Geophysical Bulletin No. 32.
O’Reilly, B.M., Readman, P.W. & Murphy, T. 1996. The gravity signature of Caledonian and Variscan tectonics in Ireland. Physics and Chemistry of the Earth 21, 299-304.
Readman, P.W., O’Reilly, B.M. & Murphy, T. 1997. Gravity gradients and upper crustal tectonic fabrics, Ireland. Journal of the Geological Society, London 154, 817-828.
Thirlaway, H.I.S. 1951. – Measurements of gravity in Ireland: Gravimeter observations between Dublin, Sligo, Galway and Cork. Geophysical Memoirs, Dublin Institute for Advanced Studies Ireland, No. 2, part 3.
Geophysics
La Soufriere volcano raised to alert level Red St. Augustine, Trinidad and Tobago, W.I. – 6:30pm April 8th, 2021 - Scientists have observed a significant increase in activity at La Soufriere volcano which has prompted The Government of SVG to raise the volcanic alert level 1/7 Retweeted by DIAS Geophysics
A nice new collection of work on volcanic, earthquake, and landslide hazards from the nature group. Lots of interesting stuff here, including our recent paper on Sierra Negra with @GeosciencesEd, @volcano_dr, @IGecuador, @dias_geophysics, et al. twitter.com/NatureComms/st… Retweeted by DIAS Geophysics
A new #volcanic #fissure opened up yesterday noon, NE of Geldingadalir, where an #eruption has been ongoing since 19 March. #Magma is flowing at a rather fast pace from the ~200m long fissure to Merardalir valley #EUROVOLC #volcanichazard #volcanicrisk Retweeted by DIAS Geophysics
Which mechanisms drive the triggering of volcanic unrest? What role does changes in volcanic materials play? Novel ground motion measurements can help answer these questions. And so can you, in a @SPIN_itn PhD project at @dias_geophysics! Apply now: spin-itn.eu/esr41 Retweeted by DIAS Geophysics
1942 Dr. Sheila Tinney of Galway Pioneering Irish mathematical physicist. Aged 23 she earned her PhD under future Nobel prize winner Max Born on "Stability in Crystals" Image credit: Tinney Family, Mathematics Ireland #Science #Ireland #Galway #History #Quantum .@DIAS_Dublin Retweeted by DIAS Geophysics
Our 1st speaker of the April 8th #ShakeMeetup is @seismotom! Thomas Lecocq is a #Seismologist at the Royal Observatory of Belgium who created the open source code to study the global decrease in seismic noise due to the past lockdown. ➡️ buff.ly/3vXYS4n Retweeted by DIAS Geophysics
This is 1 year ago. That idea, on April Fools' Day... Less than 4 month later, the 76-author article was published online! What a year, damn 2020. The worst and the best! Science, our way! Sharing knowledge, codes, data... is THE way. I'm a f* open-scientist! Thanks to you all!❤ twitter.com/seismotom/stat… Retweeted by DIAS Geophysics
How is Tomorrow's Cities working to engage different stakeholders? How has the Covid-19 pandemic impacted our ability to engage? And what are we learning about what works and what doesn’t? Read this blog to see our MEL team's analysis: tomorrowscities.org/stakeholder-en… 📸@SIAS_Southasia Retweeted by DIAS Geophysics
M2.6 & M2.3 earthquakes occurred this morning in the Rockall Trough. Confirmed by INSN operated by @dias_geophysics @DIAS_Dublin in co-operation with @GeolSurvIE . Details tinyurl.com/3csjumm2 @k_verbruggen @GeoSurveyNI #DIASdiscovers
1933, Erwin Schrödinger Austrian-Irish physicist Éamon de Valera (himself a mathematician!) personally persuaded Schrödinger to join the Dublin Institute for Advanced Studies in 1939. Image: Nobel foundation, Wikimedia Commons #physicist #Clontarf #dublinireland #DeOldify Retweeted by DIAS Geophysics
1942 @DIAS_Dublin First row from left: Sheila Tinney, Pádraig de Brún, Paul Dirac, Éamon de Valera, Arthur Conway, Arthur Eddington, Erwin Schrödinger, Albert Joseph McConnell. Image: DIAS, Wikicommons #Ireland #Dublin #Science #History Retweeted by DIAS Geophysics
Sierra Negra—the basaltic caldera found on the Galápagos Islands—went through resurgence after eruption, a rarity for this type of volcano. Story by @Sarah_Derouin, research by @AndyFBell (@EdinburghUni & @GeosciencesEd), @volcano_dr (@PennState) et al. eos.org/articles/obser… Retweeted by DIAS Geophysics
Time to get out your camera or phone, and look up to the heavens and see what you can capture 📸 Closing date for the @DIAS_Dublin Reach for the Stars competition is 2nd April. alicepr.com/featured/final… Retweeted by DIAS Geophysics
"Government approves landmark Climate Bill putting Ireland on the path to net-zero emissions by 2050." The case emissions reductions couldn't be clearer than in these visualisations. @EPAIreland @MetEireann @KOSullivanIT gov.ie/en/press-relea… youtube.com/watch?v=Rw6Bsa… Retweeted by DIAS Geophysics
Did you miss the IOP Tyndall Lecture on Monday with @DIASAstronomy's @petertgallagher ? Great news it's now available on YouTube. #DIASdiscovers twitter.com/IOP_Ireland/st… Retweeted by DIAS Geophysics
Activity is gradually increasing at #Etna's Southeast Crater, building up toward the 16th paroxysmal eruptive episode in little more than five weeks. Loud detonations audible in the southern sector of the volcano. View is from home in Tremestieri Etneo Retweeted by DIAS Geophysics
#WorldMetDay is 23 March. The #Ocean, our #climate and #weather. The ocean drives climate and weather. It absorbs around 90% of excess heat trapped by C02. #ClimateChange makes it more vulnerable and hazardous. #OceanDecade Resources at bit.ly/2OTifKU Retweeted by DIAS Geophysics
Blue regions are at the lower limit and show quiescent periods. Red regions are at the high limit and signify active periods. #DIASdiscovers #WorldMetDay
Links can be seen between wave height and seismic amplitudes. Below are wave heights from Met Eireann's M6 buoy, seismic displacement from a seismometer in western Donegal (12km from the coast) and a spectrogram of the seismic data from April 2012. #WorldMetDay #OceanScience
We are collaborators with @MetEireann and @DIASAstronomy in 'Space Weather' research and we are recording natural magnetic and electric field variations in County Kerry to assist this exciting research. #DIASdiscovers #worldmetday