[HN Gopher] Latest Earthquakes
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Latest Earthquakes
Author : DyslexicAtheist
Score : 38 points
Date : 2021-12-08 20:21 UTC (2 hours ago)
(HTM) web link (earthquake.usgs.gov)
(TXT) w3m dump (earthquake.usgs.gov)
| doodlebugging wrote:
| This is a continuation of fairly normal activity along that plate
| boundary of the coast of Oregon. I have watched this whole area
| for a long time just for grins.
|
| I have another map that may put some of it into perspective.
|
| https://earthquake.usgs.gov/earthquakes/map/?extent=30.82678...
|
| That is a mouthful if you had to say it but it works out to be
| the locations of every event with a magnitude greater than 4.5
| since Jan. 1, 2018 in the map area defined by the coordinates in
| the link (basically bounded on the east by the Nevada border, on
| the south by the California/Mexico border, on the north by the
| northernmost quake in Idaho, and on the west by the plate
| boundary where we see the new activity.
|
| Notice all the events along the California/Nevada border. Most of
| those are related to the July 2019 Ridgecrest earthquake which
| was a magnitude 7.1 event preceded about 34 hours earlier by a
| magnitude 6.4. Since that event, the faulted zone from Ridgecrest
| toward Mammoth Lakes and on to Carson City has seen increased
| activity that propagates from south to north and that has
| reactivated the east-west fault that runs east of Mono Lake into
| Nevada. Over time, probably the next few years, you will likely
| see similar quakes between Carson City and Medford, Oregon along
| that zone. That appears to be the eastern end of the plunging
| plate where we see the current quake swarm if you trace it out.
| (The edge may be near Yreka/McDoel CA area in the Cedar Mtn Fault
| System where the main faulting along the eastern Sierra/Cascades
| takes a more northerly turn.
|
| Remember that the red squiggles are mapped faults and that they
| are actually continuous in the subsurface along zones of faulting
| that follows the general squiggle trend.
|
| The latest activity on the transform fault offshore just
| continues that older trend (grey dots are events that have
| happened since Jan 1, 2018 and that are more than a month old)
| out to the western edge of that plate.
|
| Interesting stuff. I'm not a seismologist, just a geophysicist.
| This stuff interests me as I like to look for patterns in life.
| Don't use any of this in any official capacity. Follow the
| science and take everything in this post as a simple description
| of one person's observations of events and data in one geographic
| area that probably could be interpreted in multiple ways, even by
| the same person. As such this is meant to entertain, not to
| inform.
| jedberg wrote:
| If you do feel a quake, don't forget to report it to the USGS!
| They need your data.
| jeanchen wrote:
| This is my favorite way of blowing off adrenaline after an
| earthquake. It's also fun to watch the reports roll in and see
| how different areas were affected.
| divbzero wrote:
| Don't the USGS have seismographs for detecting earthquakes?
| Does human reporting add resolution or other information to
| their data?
| jedberg wrote:
| > Does human reporting add resolution or other information to
| their data?
|
| Yes, a lot. They only have so many seismographs. They ask a
| bunch of survey questions that get them a pretty good
| qualitative score of the experience in your exact location,
| and when merged together gives them a much better picture of
| how the waves propagated.
|
| Also they ask you questions about damage, which they can't
| get from anywhere else.
| gvhst wrote:
| https://earthquake.usgs.gov/data/dyfi/ USGS' "Did you Feel it
| Program" helps USGS figure out how seismic waves travel
| through the crust, which isn't uniform in density. Useful
| beyond seismographs.
| Turing_Machine wrote:
| Sure, they have seismographs, but they don't necessarily have
| full details on all the subsurface geology between you and
| the epicenter. Wave propagation can be complicated...
| depending on what's down there, the waves can intensified,
| dissipated, reflected...
|
| If (e.g.) everyone in a small area reports strong shaking,
| while those in surrounding areas report less, that can
| indicate a need for further investigation as to whether the
| area that experienced strong shaking poses a specific risk.
| DantesKite wrote:
| It would be interesting if you could accumulate seismic data
| with iPhones. Like if they're stationary for more than 10
| minutes, share data with USGS.
| version_five wrote:
| I liked the previous title about the Monster of the Cascadian
| Basin. I looked it up (found nothing) but came across this on the
| cascadian subduction zone:
|
| https://pnsn.org/outreach/earthquakesources/csz
|
| This is what's responsible for "megathrust" earthquakes on the
| west coast every 400-600 years. It seems we're early for one of
| those, so this is probably not that. I'd love to see more info on
| the significance, if any, of this movement.
| DyslexicAtheist wrote:
| there is a great article on this in the new yorker that has
| been discussed here a few times. Won some awards for its
| writing too: https://www.newyorker.com/magazine/2015/07/20/the-
| really-big...
| 1shooner wrote:
| My favorite line from that article:
|
| >Kenneth Murphy, who directs FEMA's Region X, the division
| responsible for Oregon, Washington, Idaho, and Alaska, says,
| "Our operating assumption is that everything west of
| Interstate 5 will be toast."
| Asparagirl wrote:
| These too:
|
| "Until 1974, the state of Oregon had no seismic
| code...seventy-five per cent of all structures in the state
| are not designed to withstand a major Cascadia quake..."
|
| "The shaking from the Cascadia quake will set off
| landslides throughout the region--up to thirty thousand of
| them in Seattle alone...Fifteen per cent of Seattle is
| built on liquefiable land, including seventeen day-care
| centers and the homes of some thirty-four thousand five
| hundred people..."
|
| "On the coast, those numbers go up. Whoever chooses or has
| no choice but to stay there will spend three to six months
| without electricity, one to three years without drinking
| water and sewage systems, and three or more years without
| hospitals..."
| jldugger wrote:
| So, time to add a lifestraw and shovel to the go bag.
| Asparagirl wrote:
| Yes, that article is a classic, in the Venn diagram
| intersection of "hard science explained well" and "creative
| ways to get historical data" and "both local and federal
| government failure to plan or address known issues" and "we
| were warned" and "absolute nightmare fuel".
|
| If/when the Cascadia superquake kicks off, everyone will be
| passing that link around, so you may as well read it now.
| mutagen wrote:
| More accurately, these quakes are on a strike-slip fault (named
| the Blanco Fracture Zone) on the other side of the Juan de Fuca
| plate from the Cascadian Subduction Zone. This fault won't
| directly produce 'the big one' but this movement will be
| building pressure and tension in the subduction zone.
|
| https://www.npr.org/2021/12/08/1062365995/50-earthquakes-hit...
|
| https://www.sciencedirect.com/topics/earth-and-planetary-sci...
| belter wrote:
| This site ... integrated over Real time Solar Flares:
| https://www.spaceweatherlive.com/en/solar-activity/solar-fla...
|
| and random noise form Live Meteor: https://meteorscan.com/meteor-
| live.html
|
| runs my Random Number Generator....
| sheepybloke wrote:
| I would be really interested in a write up of this!
| g0ran wrote:
| How do you seed when there's no activity on all three fronts?
| belter wrote:
| I fall back on real time neutrino event detection :-)
| https://gcn.gsfc.nasa.gov/amon_hese_events.html
| nodicksplease wrote:
| i hope they fix the browser back button
| thedigitalone wrote:
| That particular swam of quakes isn't anything to worry about
| https://www.npr.org/2021/12/08/1062365995/50-earthquakes-hit...
| samiur1204 wrote:
| Not really directly connected to the Cascadia Subduction Zone
|
| https://www.npr.org/2021/12/08/1062365995/50-earthquakes-hit....
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(page generated 2021-12-08 23:00 UTC)