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Prikvačeni tweet
The potential for increased weather disasters coming with climate change make the earthquake problem look small. My music on the data of the changing climate: In Nomine Terra Calens: In the name of a warming Earth https://youtu.be/4plSXjcjxVA via
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Frank Press convinced me to go to MIT and was an inspiration to generations of seismologists. He will be missed.https://www.washingtonpost.com/local/obituaries/frank-press-guiding-force-in-us-science-policy-for-years-dies-at-95/2020/01/31/f73768ae-442f-11ea-b503-2b077c436617_story.html …
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Natural hazards are inevitable but natural disasters are not. Some of my thoughts about why resilience is important and how we get there. https://seblog.strongtie.com/2020/01/dr-lucy-jones-mitigation-creates-community-resilience/ … via
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The fault orientation and type forms the pattern of seismic waves radiated by the quake and recorded at many stations. We calculate a moment tensor that matches that pattern, so can see the fault within ~15 min. https://earthquake.usgs.gov/earthquakes/eventpage/us60007idc/moment-tensor …https://twitter.com/MarcGrandmaison/status/1222299634393133056 …
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Dr. Lucy Jones proslijedio/la je Tweet
The rate of large earthquakes right now is totally ordinary, geologically. The happenstance of a few in more populated areas means we've seen a little more media reporting, plus once you start noticing them, it's hard to stop!https://twitter.com/DrWendyRocks/status/1220873702247665664 …
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The Jamaican M7.7 is not related to the Puerto Rican quake. Triggering of another quake happens within ~3x length of the 1st fault. The PR quake was on a ~15 mile long fault, but the M7.7 was over 800 miles away. Way too far away to be related.https://twitter.com/LaBeautyologist/status/1222282383455506432 …
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The M6.5 near the Caymans is almost certainly an aftershock of the M7.7. The M7.7 fault should be 100+ miles long - aftershocks show which way the fault runs from the mainshock. This
@USGS map shows the Cayman event is ~120 miles down the Oriente fault from the M7.7 https://twitter.com/telegon/status/1222279436315385857 …pic.twitter.com/JRN2b6EUc3
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6 of 6: Today's Jamaican quake is strike-slip & did not produce a tsunami. Because there is no tsunami at the source, there cannot be a tsunami showing up somewhere else (like the US)
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5 of 6: Tsunami waves move fast ~450 mi/hr. Faults near shore produce tsunamis that can arrive in a few minutes to 10s of minutes after you feel strong shaking. Time to go up hill. Tsunamis come in a series of waves that can last for a day. The first wave may not be the biggest
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4 of 6: Strike-slip faults (faults that move the ground sideways, not vertically), like Jamaica, do not cause tsunamis b/c they do not change height of the seafloor. They can cause a local tsunami by triggering underwater landslides.
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3 of 6: The 2 main causes of tsunamis are quakes on faults that push up seafloor & landslides. How big a tsunami is = how much water is displaced = how much seafloor moves up by how much. Only the biggest quakes (M≥8.5) move enough water to create a tsunami that crosses ocean
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2 of 6: Tsunamis get taller when they approach shore. The whole column of seawater above a fault is moved, so there is a lot of water & energy in the wave, more if the sea is deeper at the source. As it approaches shore & depth of sea decreases, the height of the wave increases.
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A tsunami primer (1 of 6): Tsunamis begin when the shape of the seafloor changes suddenly. The water above the changed seafloor is pushed up, but then because it is a fluid, immediately falls down to both sides, creating the wave that moves towards shore
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The M7.7 Jamaican quake produced sideways motion on the fault, so the tsunami risk is low. (Seafloor should move up to make tsunami.) But if I'm ever at the beach and feel strong shaking, I move to high ground. Downside is I lose a day at the beach. The upside could be my life.
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A M7.7 has been reported northwest of Jamaica. It appears to be the transform fault boundary between the North American and Caribbean plates.pic.twitter.com/jpVq5fmtJg
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Dr. Lucy Jones proslijedio/la je Tweet
When you want to make a pattern out of a group of
#earthquakes, remember that earthquakes happen all the time, and we need statistics to tell us if our pattern is just coincidence. Just because we want a pattern doesn’t make the pattern real.http://drlucyjones.com/the-ring-of-fire-and-other-earthquake-myths/ …Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
I sure wish I could tell when a quake is going to be a foreshock. I spent many years looking at foreshocks to try to find something that made them different. Never found it. We will know if it's one of the 5% that become a foreshock if something bigger happens.
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Tonight's quake more scientifically interesting. M4.6 north of Barstow, ~halfway between 2019 Ridgecrest and 1992 Landers faults. 1947 M6.5 Manix quake was ~30 miles east of tonight's quake. Occurred on an unmapped thrust fault. Only Barstow seems to care
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In the last 11 yrs,
@USGS USGS recorded 1496 M≥6 events, 1 every 2.7 days. The first 25 days of January 2020 had 10 quakes M≥6. Almost exactly the average of the last 11 years. So, no. I don't see an increase. You can look yourself at https://earthquake.usgs.gov/earthquakes/search/ …https://twitter.com/pitpatj/status/1220842048858685440 …Hvala. Twitter će to iskoristiti za poboljšanje vaše vremenske crte. PoništiPoništi -
3. A M3 happens many miles below the surface on a fault a few meters across. No way to connect them with any mapped fault. 4. Foreshocks look like any other quake. We only know it's a foreshock when something bigger happens. Then I can wake up.
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(1 of 2)Why you should not expect me to get up in the middle of the night for a M3+ quake: 1. A M3+ happens in SoCal a few times per week. I sleep 8 hr/day so I'd be disrupting my sleep ~1/wk 2. There's nothing interesting about another M3. They happen every week.
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