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Earthquakes

  • 17-02-2018 11:36am
    #1
    Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭


    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


«1345

Comments

  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer


    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.
    ...


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


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,335 CMod ✭✭✭✭Black Swan


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


  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer


    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: 47,335 CMod ✭✭✭✭Black Swan


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


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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: 1,719 Mod ✭✭✭✭star gazer


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


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


  • Moderators, Society & Culture Moderators Posts: 9,733 Mod ✭✭✭✭Manach


    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.


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    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, Registered Users 2 Posts: 1,943 ✭✭✭tabbey


    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: 47,335 CMod ✭✭✭✭Black Swan


    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


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    Injecting Midwest earthquakes. What's next?


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,335 CMod ✭✭✭✭Black Swan


    Magnitude 4.7 Fortuna, California.


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


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators, Regional East Moderators, Regional Midlands Moderators, Regional Midwest Moderators, Regional Abroad Moderators, Regional North Mods, Regional West Moderators, Regional South East Moderators, Regional North East Moderators, Regional North West Moderators, Regional South Moderators Posts: 9,300 CMod ✭✭✭✭Fathom


    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 East Moderators, Regional Midlands Moderators, Regional Midwest Moderators, Regional Abroad Moderators, Regional North Mods, Regional West Moderators, Regional South East Moderators, Regional North East Moderators, Regional North West Moderators, Regional South Moderators Posts: 9,300 CMod ✭✭✭✭Fathom


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


  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer


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


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


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    Magnitude 3.0 earthquake 4 miles from Rialto, CA


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    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 East Moderators, Regional Midlands Moderators, Regional Midwest Moderators, Regional Abroad Moderators, Regional North Mods, Regional West Moderators, Regional South East Moderators, Regional North East Moderators, Regional North West Moderators, Regional South Moderators Posts: 9,300 CMod ✭✭✭✭Fathom


    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: 47,335 CMod ✭✭✭✭Black Swan


    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.


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    LA and SoCal: 234 earthquakes in the past 30 days


  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer


    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).


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    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.


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    Today: 2.0 in Weldon, California.


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,335 CMod ✭✭✭✭Black Swan


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


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    3.9 in Borrego Springs, California


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    today: 3.3 in Alamo, California


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    today: 3.7 in Avalon, California


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    today: 2.3 in Cambria, California


  • Registered Users Posts: 1,580 ✭✭✭Testament1


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

    It could be. The 2011 quake that devastated Christchurch, New Zealand is considered by some geologists to have been an aftershock of a strong quake in the area nearly 6 months previously. The quake museum/exhibit in Christchurch is actually very interesting if you ever find yourself there


  • Moderators, Category Moderators, Science, Health & Environment Moderators, Society & Culture Moderators Posts: 47,335 CMod ✭✭✭✭Black Swan


    "Marsquakes" will be measured by the NASA InSight Mars mission.

    Ref: http://www.bbc.com/news/science-environment-43981895


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    Hawaii had earthquake. Volcanic eruption precursor?


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  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer


    6.4 magnitude earthquake in Lombok, Indonesia.


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    Magnitude 4.2 earthquake, 19 miles from Ensenada, Baja California, Mexico · Jul 25, 1:17 PM


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    Magnitude 3.7 earthquake 6 miles from Black Point-Green Point, CA · Jul 30, 3:22 PM


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    Magnitude 2.9 earthquake 10 miles from Suisun City, CA · 10:01 AM


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    Magnitude 2.7 earthquake 15 miles from Soledad, CA · 3:17 PM


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    Magnitude 2.8 earthquake 9 miles from Suisun City, CA · 7:35 AM


  • Closed Accounts Posts: 2,988 ✭✭✭jacksie66


    This post has been deleted.


  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer




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    star gazer wrote: »
    7.0 Wow! Today Magnitude 2.7 earthquake 5 miles from Hollister, CA · 9:00 AM


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    Took a few classes in Geology. Earth a moving planet. Magnitude 5.8 earthquake Affected country: Svalbard and Jan Mayen 409 miles from Tromsø, Norway · Aug 7, 6:57 AM


  • Moderators, Society & Culture Moderators Posts: 1,719 Mod ✭✭✭✭star gazer




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    Magnitude 3.0 earthquake 4 miles from Mammoth Lakes, CA · Aug 9, 10:22 AM


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    2.3 magnitude earthquake 7 km from Aguanga, California, United States about 13 hours ago


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    Magnitude 6.4 earthquake 85 miles from Prudhoe Bay, AK · Aug 12, 7:58 AM


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    At least 24 injured after 5.0 magnitude earthquake jolted Yuxi, China.


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