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Tsunami warning ends for B.C. after large earthquake strikes off Alaska
- dmm 9y agoUSGS page for this quake: https://earthquake.usgs.gov/earthquakes/eventpage/us2000cmy3#executive https://earthquake.usgs.gov/earthquakes/eventpage/us2000cmy3...
- deleted 9y ago[deleted]
- walterbell 9y agoWhen was the most recent ‘red’ tsunami warning for US west coast & BC? Which coastal areas were physically affected by that one? Edit: 2005 review: https://soundwaves.usgs.gov/2005/01/fieldwork2.html https://soundwaves.usgs.gov/2005/01/fieldwork2.html Lessons: https://pubs.usgs.gov/circ/c1187/ https://pubs.usgs.gov/circ/c1187/
- raldi 9y agoThere's a difference between a watch and a warning.
- dawnerd 9y agoSome buoy data: https://twitter.com/BillKarins/status/955747863140675585 https://twitter.com/BillKarins/status/955747863140675585
- JorgeGT 9y agoLink to the actual buoy data page: http://www.ndbc.noaa.gov/station_page.php?station=46410&type=2&seriestime=20180123093315 http://www.ndbc.noaa.gov/station_page.php?station=46410&type... Worth noting that other nearby buoys don't show such a dramatic wave: http://www.ndbc.noaa.gov/station_page.php?station=46409&type=2&seriestime=20180123093200 http://www.ndbc.noaa.gov/station_page.php?station=46409&type... Here's a map: http://www.ndbc.noaa.gov/obs.shtml http://www.ndbc.noaa.gov/obs.shtml (click on the blinking ones) And here's a map of tsunami-capable tide stations: https://tidesandcurrents.noaa.gov/tsunami/# https://tidesandcurrents.noaa.gov/tsunami/#
- dawnerd 9y agoThanks, was having trouble getting it to load on my phone.
- wiredfool 9y agoI'd be _really_ suspicious of data showing a 10M tsunami in the open ocean. In deep water, they're super long wavelength low amplitude waves, it's only when they interact with the bottom that the wave piles up and gets to large amplitude.
- z3t4 9y agoyeh, that would be like over 100m when it hits shallow water. But if the water level is unusually low then GTFO!
- onnoonno 9y agoWhat I don't get is that nearly all the buoys that have that moving icon "Tsunami alert" show some excitation at the ~9:45GMT mark. But I would of course expect the buoys that are farther away to only show some kind of peak when the wave actually reaches them. And it looks like they are thousands of km away, so some of them should not even have been reached yet. Some what is going on there? Is the data time actually shifted and not in GMT but 'earthquake propagation time'? Am I reading the plots wrong?
- yread 9y agoThe tsunami alert: http://ptwc.weather.gov/ptwc/text.php?id=hawaii.TSUHWX.2018.01.23.1021 http://ptwc.weather.gov/ptwc/text.php?id=hawaii.TSUHWX.2018.... IF TSUNAMI WAVES IMPACT HAWAII THE ESTIMATED EARLIEST ARRIVAL OF THE FIRST TSUNAMI WAVE IS 0423 AM HST TUE 23 JAN 2018
- JorgeGT 9y agoTimes for Alaska: Estimated tsunami start times for selected sites are; Kodiak Alaska 145 AM. AKST. January 23. Elfin Cove Alaska 150 AM. AKST. January 23. Seward Alaska 155 AM. AKST. January 23. Yakutat Alaska 200 AM. AKST. January 23. Sitka Alaska 200 AM. AKST. January 23. Langara British Columbia 210 AM. AKST. January 23. Valdez Alaska 215 AM. AKST. January 23. Cordova Alaska 220 AM. AKST. January 23. Sand Point Alaska 220 AM. AKST. January 23. Unalaska Alaska 240 AM. AKST. January 23. Homer Alaska 250 AM. AKST. January 23. Craig Alaska 300 AM. AKST. January 23. Cold Bay Alaska 300 AM. AKST. January 23. Adak Alaska 305 AM. AKST. January 23. Tofino British Columbia 340 AM. AKST. January 23. Shemya Alaska 345 AM. AKST. January 23. Saint Paul Alaska 400 AM. AKST. January 23. Source: http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=Tsunami%20Warning http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa...
- porker 9y agoDo you know why these reports mention Hawaii, rather than (say) Vancouver and other coastal cities nearer to the epicenter, where I would imagine a tsunami would reach first?
- JorgeGT 9y agoThe page is specific to Hawaii, but you can go to http://www.weather.gov/ http://www.weather.gov/ and in the map, click your region and then "tsunami warning" or "tsunami watch" to see estimated times for other states. This is the tsunami watch notice for coastal areas of Oregon, Washington & California: http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=sew&wwa=tsunami%20watch http://forecast.weather.gov/wwamap/wwatxtget.php?cwa=sew&wwa...
- mathgenius 9y agoWow 15 hours to australia, that thing is moving fast.
- raverbashing 9y agoSlower than the speed of sound in water, but still very impressive
- jedberg 9y agoFaster than an airplane though.
- yitchelle 9y agoPerhaps, the arc distance traveled for the wave is a smaller than the plane's. The plane is flying 10Km in the sky.
- joe-aws 9y agoThe difference in arc lengths is less than you'd think-- It's only about 20km further assuming Alaska is 1/3 of the world's circumference away from Australia. (1/3)*(2*pi*(r+10) - 2*pi*r) = (1/3)(20*pi) ~= 20
- yitchelle 9y agoWow, that is surprising. I should have thought about it further. The radius of earth is 6371Km and 10Km works out to be 0.15% of it. So 20Km is reasonable.
- Jedi72 9y agoWill this wave affect boats? Imagine being on a yacht in the middle of the Pacific (not Atlantic Doh!) when a 10m wave moving at 20m/s hits (figures not accurate just guesses)
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- mordechai9000 9y agoI felt it here in Anchorage when I was on my way to bed. It felt like a shallow, rolling earthquake. It reminded me of a quake I experienced in 2001 in Washington state. The shaking went on for what I thought was 30 seconds. My wife woke up but my kids did not. Within a couple of minutes, I saw the reported magnitude, depth, and location on the USGS earthquake site, https://earthquake.usgs.gov/earthquakes/map/ https://earthquake.usgs.gov/earthquakes/map/. About the same time, Google started showing a tsunami alert: https://www.google.org/publicalerts/alert?aid=43774f005241acb5&source=ogs&authuser=0 https://www.google.org/publicalerts/alert?aid=43774f005241ac... We are in no danger from a tsunami here in Anchorage. The alert shows potential tsunami waves arriving at coastal towns over the next couple of hours, with the first potential wave arriving in Kodiak in a few minutes. I have no idea how likely these waves are, but 7.9 is big. I am sure a lot of people are scrambling for high ground now. God speed and be safe.
- justonepost 9y agohttps://tidesandcurrents.noaa.gov/tsunami/plot.html?stnid=9457292&name=Kodiak%20Island https://tidesandcurrents.noaa.gov/tsunami/plot.html?stnid=94... So far so good.
- McKayDavis 9y agoThe Tsunami Watch for Hawaii was cancelled at 1:10am HST. [1] http://ptwc.weather.gov/ptwc/text.php?id=hawaii.TSUHWX.2018.01.23.1110 http://ptwc.weather.gov/ptwc/text.php?id=hawaii.TSUHWX.2018....
- McKayDavis 9y agoAll tsunami warnings and watches were cancelled at 2:12am HST / 3:12am AKST / 4:12am PST / 12:12pm GMT. There remains a tsunami advisory in effect for South Alaska and the Alaska Peninsula. [1] http://tsunami.gov/events/PAAQ/2018/01/23/p3054t/5/WEAK51/WEAK51.txt http://tsunami.gov/events/PAAQ/2018/01/23/p3054t/5/WEAK51/WE... mirror of [1] https://gist.github.com/mckaydavis/8693d4ae9bb844f8bccef90bd498ceb3 https://gist.github.com/mckaydavis/8693d4ae9bb844f8bccef90bd...
- justonepost 9y agoKodiak Police Department 7 mins · TSUNAMI UPDATE: 0229 hours Harbor officers report water reciding from our harbor. Citizens should remain in place and wait for further updates. https://www.facebook.com/KodiakPD/ https://www.facebook.com/KodiakPD/
- cal5k 9y agoI hope everything is okay - but I’m finding this a fascinating real-time case study of the chaotic nature of breaking information during a (potential) disaster. Conflicting reports, false alarms, difficult-to-parse data...
- porker 9y agoAnd a number of false-but-believable tweets by people, I presume for the attention. E.g. "Harbor X is emptying", or "Wave now 60ft high!"
- cal5k 9y agoThere was a study done a while back basically demonstrating that following breaking news too closely actually resulted in a less accurate recollection of the facts. Turns out it’s difficult to forget compelling information even if it ultimately proves to be false (and you’re aware that it’s false).
- bob_theslob646 9y agoSource?
- robtaylor 9y agohttps://twitter.com/SF_emergency/status/955764708442714113 https://twitter.com/SF_emergency/status/955764708442714113 San Francisco Department of Emergency Management has tweeted that people within three blocks of the coast or five blocks of the San Francisco Bay should be prepared to evacuate. Tsunami Watch for #SF. If you are w/in SF & 3 blocks of the Pacific Coast or w/in 5 blocks of SF Bay, PREPARE TO EVACUATE SO YOU ARE READY IF EVACUATION IS NEEDED. Check on neighbors who may need help. Visit http://sf72.org/hazard/tsunamis http://sf72.org/hazard/tsunamis to see if you are in the evacuation zone.
- raldi 9y agoWe like to laugh about the Tuesday siren tests, but times like this are why we do them. If a tsunami really does hit WA and OR expect the waterfront sirens to make a pre-dawn announcement.
- studio_monolith 9y agoExcept that was not a test
- nanch 9y agoTsunami watch has been cancelled for Washington, Oregon, and California. https://twitter.com/NWSEureka/status/955777068377296896 https://twitter.com/NWSEureka/status/955777068377296896
- throwawaybbqed 9y agoI'm a recent newcomer to the Bay area. What is the Tsunami situation for places like Mountain View? Places like the GooglePlex are pretty close to the Bay. Is there even any real high ground in the area?? If something happens for real, do sirens sound?
- Cerium 9y agoMost bay area residents do not fear tsunami. The risk is low since local faults slip side to side which do not cause tsunami. A subduction fault can cause a tsunami, such as in Alaska, Japan or Chile. We would get hours of warning in such a case.
- oasisbob 9y agoSince the danger seems to be receding -- I hope NWS & related agencies can use this as a good drill to fix their web properties. Tsunami.gov couldn't handle the load, and many other official links (like mobile.weather.gov) just dump you into a government shutdown notice. Cell.weather.gov isn't even resolving. I'm sure someone thought the critical products would still be easily available even with a government shutdown, it sure didn't work out that way.
- pc86 9y agoMost of the labor contracts (not to mention ADA litigation) for the government require a certain level of service if the property is in use. With the government shut down that's not the case. It's the same reason for the infamous "this website is only available from ~9am to ~5pm" nonsense you can find on certain Social Security/IRS pages.
- koheripbal 9y agoWhy would a website go down during a government shutdown? It actually takes more work to turn it off, doesn't it?
- neuromute 9y agoA website can go down due to heavy load on the server/a spike in traffic.
- xxpor 9y agoIf there's no appropriation to pay for say, hosting or electricity, you have to shut it off.
- influx 9y agoQuite honestly these agencies use it as an example of the value they provide by shutting down unnecessarily. I don’t really blame them though.
- koenigdavidmj 9y agoThose are probably not essential as far as the shutdown is concerned. Even NTSB investigations aren’t—there was a train crash or something during the 2013 shutdown that wasn’t investigated.
- jofer 9y agoWhat's really wild about this is that it's actually a strike-slip earthquake, based on the focal mechanism (e.g. https://earthquake.usgs.gov/earthquakes/eventpage/us2000cmy3#moment-tensor https://earthquake.usgs.gov/earthquakes/eventpage/us2000cmy3...) Given how big it is, I'm extremely surprised that it's stike slip. Furthermore, given the area (shallow and very near a subduction zone), anyone would immediately guess that it was a megathrust earthquake, and therefore likely to produce a tsunami. Interestingly, it's not at all. That's likely a big part of why the tsunami watch was canceled so quickly. In addition to there being no direct detection of tsunami waves, strike slip earthquakes don't produce significant vertical movement of the seafloor (barring triggering a landslide, anyway), and therefore don't typically produce tsunamis. However, Mw 7.9 is huge for a strike-slip earthquake. They're usually not that large. Furthermore, it's out in the oceanic crust of the incoming plate, so it's not a subduction zone earthquake at all. Instead, it's related to internal deformation of the incoming plate (albeit very near the plate boundary, so it's not exactly an intraplate earthquake either). Large strike slip earthquakes in oceanic crust aren't unheard of, but they're quite rare. This earthquake appears similar to the large strike-slip earthquakes near Sumatra in 2012 (e.g. http://www.earthobservatory.sg/news/exceptionally-large-strike-slip-earthquakes-occur-offshore-sumatra http://www.earthobservatory.sg/news/exceptionally-large-stri...). Definitely interesting!
- njarboe 9y agoA 7.9 is quite large. That is about the maximum magnitude that the San Andreas fault produces and similar in size to the 1906 San Francisco earthquake.
- songzme 9y agowould tsunami be a concern for Californians when a big earthquake happens in California?
- scentoni 9y agoIn case you're wondering whether an Alaskan earthquake could cause damage in California, the answer is yes. The tsunami from the 1964 Good Friday earthquake in Alaska obliterated the port of Crescent City: https://en.wikipedia.org/wiki/Crescent_City,_California#Tsunamis https://en.wikipedia.org/wiki/Crescent_City,_California#Tsun...
- deleted 9y ago[deleted]
- therealdrag0 9y ago> Tsunami warning ends for B.C. after large earthquake strikes off Alaska I first interpreted this as “There was going to be a Tsunami, but then an earthquake struck which nullified it.”
- Altmed 9y agoThat's a big quake! Thank God didn't cause a tsunami, although data from buoys showed VERY early on that probability was VERY low for such an occurrence. Watch for sustained wave height for serious tsunami warnings, issues coming onshore. Should you see a quick rise, sustained or increasing height offshore, then a drop... Don't wait for it! Get off the beach, away from waterways & to higher ground. I suppode those of us in California need to be on watch for the next few weeks! DutchSinse on YouTube has been working on earthquake prediction for years, and although not 100% accurate, he's been a LOT more accurate than anyone else, and has nailed the bigger quakes. I haven't taken the time to learn his methods insideout, but I've seen him call accurately numerous earthquakes. I believe with more funding, and a staff, this guy could save many, many more lives. Having worked with these buoys, and on other NOAA projects, this DutchSince guy has a method to call earthquakes early. PLEASE support him! He is the best bet to predict quakes, to tell the difference between quakes and drilling, quakes set off by drilling, etc. He's self-taught, and is more of a scientist than many I've met that went through years of "training" of methods that simply don't work. He breathes & lives this stuff, and he is onto something, far more than ANYONE else! He gets resistance from oil companies, which is sad, as he can save them money and lives! So get your batteries, your earthquake kits, Ham radios & be ready! Stay safe, always be prepared & ready for any type of disaster! Stay safe!