John Ristau 🇨🇦 🇳🇿
Canadian-New Zealand seismologist in New Zealand. Mostly following and posting about earthquakes and seismology-related things, but occasionally other things that interest me.
- And you get to live in a great city!
- A quick summary of 2025 New Zealand earthquakes. GeoNet located more than 21 000 earthquakes in New Zealand and the Kermadec region. Magnitudes range from -0.3 – 6.8 and depth from 0 (just below the surface) – 750 km. 1/ 🧪
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- A little early morning Boxing Day shake for the lower North Island, New Zealand. Strong earthquake occurred 10 km south-west of Pongaroa: geonet.org.nz/quakes/2025p...
- A non-earthquake post - the annual Christmas turkey smoke is underway.
- The Kaikōura-North Canterbury region is a mountainous region in the northeast part of the South Island. The Alpine Fault splays into the Marlborough Fault System, including the Awatere, Clarence, and Hope Faults. These are all high slip rate faults capable of M 7+ earthquakes. 1/ 🧪
- M 7.6 Japan earthquake recorded across New Zealand from north-to-south. Interesting to note the long-period signal that occurs ~2 hours after the start of the signal. Could be the surface wave travelling the opposite direction around Earth as it looks like it arrives at the southern sites first.🧪
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- A few days ago, there was a deep (218 km) Mw 4.9 (ML 4.6) earthquake in the western part of the North Island. Earthquakes like this are common in the North Island and occur within the Pacific Plate as it subducts beneath the Australian Plate. www.geonet.org.nz/earthquake/2... 1/ 🧪
- Late yesterday evening we had a M 4.9 earthquake in Cook Strait that was widely felt (~30K felt reports), mainly in the southern North Island and northern South Island. Shaking intensity was MMI ~4.5 in the Wellington region and northern South Island. 1/ 🧪
- A bit of a shake at our place. Moderate earthquake occurred 25 km north-west of Wellington: geonet.org.nz/quakes/2025p...
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- Reposted by John Ristau 🇨🇦 🇳🇿Right on schedule! More than 10,000 tiny tremors (not felt) have rolled through #PugetSound and southern #VancouverIsland over the past 30 days. This is Episodic Tremor and Slip (ETS) and occurs here every 12-16 months: www.earthquakescanada.nrcan.gc.ca/pprs-pprp/pu... Also - it is #ShakeOut day! ⚒️🧪
- The West Coast-Southern Alps region runs along the west coast of the South Island. The Southern Alps is a major mountain range the runs along the west coast between Fiordland to the south and the Marlborough region to the north, with the Alpine Fault running along the western edge. 1/ 🧪
- Emergency earthquake water refreshed and hopefully never to be used! 🧪
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