John Paul O'Donnell

Did Adelaide just have a earthquake? I took this 14 stories up in the city. 😬😬😬 #earthquake

Today's Mansfield earthquake in Victoria as recorded on the seismograph in Government House, Adelaide. I clearly felt the vibrations at my desk in the Geological Survey of South Australia in Adelaide CBD.

AusArray SA seismic squiggle harvest time in the WPA, South Australia. Thanks to Col Telfer from the @AusAirForce for the drone footage. @DEM_sagov @AuScope @GeoscienceAus

@anna_chica Nope!

@JP0Donnell did you know the seismometer is up and running at the core library again?

Reduction in human-related seismic vibration (industry, planes, trains, automobiles,...) during the South Australian lockdown evident at AuScope seismic station GHSS located in Government House, Adelaide. Scale is nanometers (nm). Data processed & plotted using SeismoRMS.

The vibrations from the M8.2 Alaska earthquake recorded at AuScope seismic station KELC on Kangaroo Island are gargantuan in comparison, even at a remove of 12,000+ km. 1 human hair = 75,000 nanometers (or so I'm told...).

Late to the party, but... sonic boom from Hayabusa-2 capsule re-entry above South Australia as captured on four GSSA AusArray SA seismic stations @DEM_sagov @AuScope @GeoscienceAus @AusSpaceAgency @haya2e_jaxa

@Tomo_wise @kate_selway @DEM_sagov @AuScope @GeoscienceAus A recovery power nap works wonders after digging those holes.

@JP0Donnell @kate_selway @DEM_sagov @AuScope @GeoscienceAus Spotted having a nap at one point there @JP0Donnell ?

Just finished the first service run of the GSSA's AusArray SA seismic network with @kate_selway and Bruce and Ann Goleby. Let's see what the data reveal... @DEM_sagov @AuScope @GeoscienceAus

The Geological Survey of South Australia deployed the AusArray SA broadband seismic array over two weeks in October 2020. Two vehicles, with a cumulative 10,000+ km covered. Phew! Thanks to @AuScope and @GeoscienceAus for the instruments @DEM_sagov

@ArcheanGeo @kate_selway It was a follow-up study... On the Spheroid-bearing Granite of Mullaghderg, Co. Donegal Frederick H. Hatch Quarterly Journal of the Geological Society, 44, 548-560, 1 February 1888, doi.org/10.1144/GSL.JG…

After many failed searches we were beginning to think this #orbicular #granite was the stuff of legends. But @JP0Donnell found it! Such a gorgeous and super-rare rock in a random little outcrop. Does anyone know much about how these form?

@ArcheanGeo @kate_selway

Rare orbicular #granite at Mullach Dearg beach, #Donegal

@staciblevins @staciblevins Sure, no problem.

@JP0Donnell Hi I saw your photo of your Emerald guitar in the snow (with the seal in the background). I am writing a book about Emerald and was wondering if I provide you photo credit, may I include it in the book? (To show it is impervious to humidity or weather restrictions).

Emerald Guitar, Emerald City, Oz... Happy St. Patrick's Day 🇮🇪 @EmeraldGuitars

Meanwhile in #Antarctica .... Video Credit: @JP0Donnell More to come soon! #TheBeastFromTheEast #BeastFromTheEast #emeraldguitars #madeinireland #emeraldfamily #travel #travelblogger emeraldguitars.com

New Year over the Atlantic. On the way to retrieve the UKANET seismometers from West Antarctica LHR > São Paulo > Santiago > Punta > Rothera @BAS_News @IGTLeeds

30 year drift from Ross Sea into Sth Atlantic! Iceberg B09D calved from Ross Ice Shelf in 1987! @icey_mark go.nasa.gov/2ygmcQq @SanGasso

Comprehensive video of seismic phases: youtube.com/watch?time_con… The picture is for P, PcP, Pdiff, PKP, PKiKP, and PKIKP