Re: [OT]:: Interest only - Kamchatka Tsunami 25-7- 30/31

Potentially terrifying stuff, but the early warning systems are fascinating
pieces of engineering

Clint. M0UAW IO83

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On Wed, 30 Jul 2025, 11:44 RussellMc, <[email protected]> wrote:

> PICList and BCCs
>
> Seemed possibly of enough interest to a few.
> Amplitude with distance is interesting.
>
> NZ max amplitudes not liable to be 1m (we'll know in 90 minutes).
> BUT a Tsunami tends to be a "step wave" - level rises and stays riz.
> I've seen video of a 1 foot / 300mm tsunami arriving in Whangarei - a
> northern NZ harbour used by many yachts - and reaking minot but significant
> havoc. Bopats straining at moorings, dinghys breaking loose. Some yacht
> groundings.
>
>
>
> *Tsunami Impact Estimates (from 8.8M Kamchatka EQ)*
> Time (NZST) Elapsed Time Location Impacted Estimated/Observed Wave Height
> (m) Notes
> *Jul 30, 11:25 AM* 0 hrs *Kamchatka Peninsula, Russia (Epicenter)* *3
> - 4 m* Initial
> waves. Flooding/damage reported.
> *Jul 30, 12:25 PM* 1 hr Northern Japan (Hokkaido) 0.3 - 0.6 m (up to 3m
> forecast) First waves observed. Larger waves possible.
> *Jul 30, 01:25 PM* 2 hrs Central/Southern Japan < 0.5 m (up to 3m
> forecast) Waves
> continue across Japan.
> *Jul 30, 02:25 PM* 3 hrs Kuril Islands (Russia) Up to 5 m Some of the
> highest observed waves reported in specific areas.
> *Jul 30, 03:25 PM* 4 hrs N/A Waves propagating across Pacific
> *Jul 30, 04:25 PM* 5 hrs N/A Waves propagating across Pacific
> *Jul 30, 05:25 PM* 6 hrs N/A Waves propagating across Pacific
> *Jul 30, 06:25 PM* 7 hrs Midway Atoll (US) ~1.8 m (peak-to-trough)
> Significant
> observation in open ocean.
> *Jul 30, 07:25 PM* 8 hrs *Hawaii* 0.9 - 1.8 m (peak-to-trough) Sirens,
> evacuations. Strong currents expected.
> *Jul 30, 08:25 PM* 9 hrs US West Coast (Monterey, CA) 0.3 - 0.6 m Tsunami
> Advisory. Strong currents, minor harbor flooding.
> *Jul 30, 09:25 PM* 10 hrs Tonga, Western Canada (Langara Island, Tofino) <
> 0.3 m (Canada) Tsunami alerts/advisories.
> *Jul 30, 10:25 PM* 11 hrs Fiji, Cook Islands, American Samoa, Guam, Alaska
> <
> 0.5 m (Guam, AK) Tsunami watches/advisories. Dangerous currents.
> *Jul 30, 11:25 PM* 12 hrs *New Zealand (Northland, East Cape)* *0.3 -
> 1 m* *NATIONAL
> ADVISORY: Strong currents & surges. NO widespread inundation.* Earliest
> arrivals for NZ.
> *Jul 31, 12:25 AM* 13 hrs *New Zealand (Wider Coastal Areas)* *0.3 - 1
> m* Tsunami
> activity (currents/surges) spreads. Stay out of water.
> *Jul 31, 01:25 AM* 14 hrs *New Zealand (Auckland, Coromandel)* *0.3 -
> 1 m* Continued
> strong currents/surges.
> *Jul 31, 02:25 AM* 15 hrs *New Zealand (Wellington, South Island East
> Coast)* *0.3 - 1 m* Impact reaches more regions. Hazard persists.
> *Jul 31, 03:25 AM - 08:25 AM+* 16-21+ hrs *New Zealand (All Coastal
> Areas)* *0.3
> - 1 m* Strong/unpredictable currents/surges will continue for many hours.
> Remain vigilant, follow official advice until all-clear.
> *Jul 31, 09:25 AM+* 22+ hrs Ecuador, Chile, Peru Up to 3 m (Ecuador
> forecast) Tsunami waves continue to propagate across the Pacific, reaching
> South American coasts significantly later.
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