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Earthquakes

  • 17-02-2018 10:36am
    #1
    Moderators, Society & Culture Moderators Posts: 1,698 Mod ✭✭✭✭ star gazer
    Moderator


    Around the world, there are several hotspots for earthquake activity that can at times cause huge damage from the Pacific ring of fire to Iceland. The destructive power of Tsunamis triggered by earthquakes was shown in recent years in Japan (2011) and Indonesia (2004).
    Seismic activity can also be a precursor of volcanic events.
    Mexico 7.2 magnitude earthquake
    Off the North of Iceland Iceland earthquake activity


«134567

Comments

  • Moderators, Society & Culture Moderators Posts: 1,698 Mod ✭✭✭✭ star gazer
    Moderator


    Up to a 5.2 magnitude under the seabed just North of Iceland. vedur
    At 05:38 UTC this morning an earthquake of magnitude M5.2 occurred 14 km ENE of Grey. It was felt widely in the Northern part of the country. Five more earthquakes with magnitude between 4-4.9 were detected over the past night. The earthquakes originate from the so-called Grey oblique rift zone in the northern Skandadjúp basin within the Tjörnes fracture zone. The earthquakes from this swarm originate at an average of around 10 km depth and the focal mechanism of the largest earthquake indicates normal faulting on a northerly striking fault.
    ...
    The closest continuous GPS station located on Grey does not show any visible deformation that might indicate magmatic intrusion. This, together with the depth of the earthquakes, suggests that the current seismic activity is most likely related to tectonic processes at a divergent plate boundary, and not related to the movement or accumulation of magma.
    ...


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Comparatively, California has hundreds of recent earthquakes. Such is normal.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,090 CMod ✭✭✭✭ Black Swan
    Category Moderator


    Fathom wrote: »
    Comparatively, California has hundreds of recent earthquakes. Such is normal.
    Indeed!


  • Moderators, Society & Culture Moderators Posts: 1,698 Mod ✭✭✭✭ star gazer
    Moderator


    Some broader earthquake maps:
    EMSC Mediterranean map (it also has a world map)
    USGS global earthquake map


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,090 CMod ✭✭✭✭ Black Swan
    Category Moderator


    Plate tectonics: Divergent and convergent plate boundaries movement cause for earthquakes and volcanoes.


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  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
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    Pangaea supercontinent Paleozoic and Mesozoic eras began to break apart about 175 million years ago. Continues today with earthquakes.


  • Moderators, Society & Culture Moderators Posts: 1,698 Mod ✭✭✭✭ star gazer
    Moderator


    Papua New Guinea A 6.7 following a 7.5 magnitude Earthquake from the 26th of February.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    The "living" crust of Earth. Geologically aways moving.


  • Moderators, Society & Culture Moderators Posts: 9,461 Mod ✭✭✭✭ Manach
    Moderator


    The vast majority of earthquakes are minor and unnoticed due to scale and depth. It is the "Black Swan" types that are the worry. In the 18th Century Lisbon went from capital of the Portugeuse empire to ruined city due to a combination of quake and Tsunami. Given historical precedents of quakes like the massive New Madrid quake of 1811, which had devastated the mostly unpopulated areas of America then when re-occurs this will effect millions and not the 100s of the 1800s.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Last 24 hours Southern California earthquakes:
    • 14 minutes ago 1.5 magnitude, 13 km depth
      Northridge, California, United States
    • about 6 hours ago 1.8 magnitude, 2 km depth
      Salton City, California, United States
    • about 11 hours ago 2.0 magnitude, 6 km depth
      Brawley, California, United States
    • about 17 hours ago 1.8 magnitude, 0 km depth
      Boron, California, United States


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  • Registered Users Posts: 1,944 ✭✭✭ tabbey
    Registered User


    Manach wrote: »
    Given historical precedents of quakes like the massive New Madrid quake of 1811, which had devastated the mostly unpopulated areas of America then when re-occurs this will effect millions and not the 100s of the 1800s.

    Where was New Madrid?


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,090 CMod ✭✭✭✭ Black Swan
    Category Moderator


    Injection of fracking wastewater has been associated with earthquakes in Oklahoma and South Dakota.

    Source: https://www.forbes.com/sites/jamesconca/2016/09/07/the-connection-between-earthquakes-and-fracking/#116b09266d68


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Injecting Midwest earthquakes. What's next?


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,090 CMod ✭✭✭✭ Black Swan
    Category Moderator


    Magnitude 4.7 Fortuna, California.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Earthquakes in California are the norm. Rare a day goes by without one.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    April 1, 2018 (Not April Fools!)
    California near San Jose
    Magnitude 2.6 earthquake
    4 miles from Aromas, CA · 3:46 AM


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    California Channel Islands. Magnitude 5.3. Felt a sway under my feet.


  • Moderators, Society & Culture Moderators Posts: 1,698 Mod ✭✭✭✭ star gazer
    Moderator


    Magnitude 6.5 Earthquake in Papua New Guinea following on from the damaging 7.5 a number of weeks ago.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    star gazer wrote: »
    Magnitude 6.5 Earthquake in Papua New Guinea following on from the damaging 7.5 a number of weeks ago.
    Aftershake?


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Magnitude 3.0 earthquake
    4 miles from Rialto, CA


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  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    99.7% chance a magnitude 6.7 quake or larger will strike California in the next 30 years.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Magnitude 3.8 earthquake
    4 miles from East Foothills, CA · Apr 16, 9:39 AM


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,090 CMod ✭✭✭✭ Black Swan
    Category Moderator


    Fathom wrote: »
    99.7% chance a magnitude 6.7 quake or larger will strike California in the next 30 years.
    California seems to be advertising preparations for the Big One more so on the telly recently.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    LA and SoCal: 234 earthquakes in the past 30 days


  • Moderators, Society & Culture Moderators Posts: 1,698 Mod ✭✭✭✭ star gazer
    Moderator


    Fathom wrote: »
    Aftershake?
    Does the six weeks later count as an aftershock? Same area, about 30km away.


    USGS earthquake scenario in the San Fransisco Bay area (hypothetical M7).


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    star gazer wrote: »
    Does the six weeks later count as an aftershock? Same area, about 30km away.


    USGS earthquake scenario in the San Fransisco Bay area (hypothetical M7).
    Maybe. Geologic time. Blink of eye.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    Today: 2.0 in Weldon, California.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,090 CMod ✭✭✭✭ Black Swan
    Category Moderator


    235 earthquakes in last month CA. That's amazing.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    3.9 in Borrego Springs, California


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  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional Abroad Moderators Posts: 8,314 CMod ✭✭✭✭ Fathom
    Moderator


    today: 3.3 in Alamo, California


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