hypocentre.bsky.social
Seismologist, geophysicist, structural geologist, geoconservationist, not necessarily in that order.
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A contemporary report from Shrewsbury noted that “great yearthquacks happened … for the space of halffe an howre”, implying strong aftershocks.
I think we should go back to calling them yearthquacks.
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Link to paper:
K.D. Wisniewski, J.K. Pringle, P. Doyle, N. Barton, I.G. Stimpson & L. Hobson, 2025: Multi-disciplinary site investigations of WW2 allied aerial bombing decoy sites in
North Staffordshire, UK, Journal of Conflict Archaeology
www.tandfonline.com/doi/full/10....
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Cornubian docking is mid-Devonian (Woodcock & Strachan). Creates a Bristol Channel high that sheds Pragian Ridgeway Conglomerate alluvial fans northwards into Pembrokeshire, followed by major unconformity.
The Bristol Channel Fault Zone is reactivated many times subsequently, including the Variscan.
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However, NNW-SSE Sticklepath-Lustleigh Fault (orange line) is known to be reactivated in the Cenozoic Alpine Orogeny. That ‘neotectonic’ (for the UK) nature, and similarity to other UK ‘quakes source orientations would suggest association with one of the NNW-SSE Sticklepath-parallel trending faults.
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Bristol Channel Fault Zone (green lines) is a major terrane boundary along which Devon/Cornwall (Cornubia) docks in a dextral strike-slip motion with the rest of the UK (and the Laurussian continent) in the mid-Devonian Acadian Orogeny. It remains a fundamental line of weakness in the UK crust.
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A largely forgotten earthquake, surprising as it was damaging in Derby, Nottingham, Loughborough area. M4.2 Aftershock the following day.
Probably associated with deep-seated faulting on the NE flank of the Midlands Microcraton / SW margin of the Widmerpool Gulf (Carboniferous graben structure).
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I’m not sure we have any focal mechanisms for large events in this area. Based on local geology and onshore events, my best guess is NW-SE dextral strike-slip on the Dowsing Fault Zone.
But it is only a guess.
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I don’t think that was outcrop. It was a stone wall made from the local rock that was removed. See also bottom left.
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agupubs.onlinelibrary.wiley.com/doi/abs/10.1...
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The M2.3 fracking-induced earthquake near Blackpool, UK, that caused the cessation of British shale gas exploration?
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By the way, I've not been slacking on the UK earthquakes front since Christmas - as far as I know there just haven't been any significant British earthquakes in January, ever!
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Mine is the ringtone developed for ‘Wallander’ in the Swedish detective series.
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Plus a bonus S-wave from yesterday’s (20:05:50 UTC 2025/01/12) M4.4 Norwegian Sea earthquake recorded on my Raspberry Shake seismometer in Newcastle-under-Lyme, England
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No. It is just on the floor the other side of my first floor home office. Sometimes get noise from the washing machine in the kitchen below but that’s about it.
I tend to find that the signals from Central/South America and Fiji/Tonga are often ’clean’. Obviously good transmission paths.
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My 2024 year in photos. One a month from my camera roll. Part 3:
September: European-African plate boundary, Terceira, Azores
October: Ercall Nonconformity
November: Wonky towers, Bologna
December: Split rock sculpture, Derwent Water.
Happy New Year to all.
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My 2024 year in photos. One a month from my camera roll. Part 2:
May: Aurora
June: Seismogram of a circling helicopter
July: Sizergh Castle
August: Bateman Gallery, Biddulph Grange
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Yes. raspberryshake.org
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shop.raspberryshake.org
Mine is a 3D.