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Steve Herman @W7VOA
, 6 tweets, 2 min read Read on Twitter
M7 #quake #Indonesia. earthquake.usgs.gov/earthquakes/ev…
Small #tsunami possible, according to #Indonesia authorities.
Latest #Indonesia #quake, which struck at a depth of ~15km off the north coast of Lombok, comes a week after a M6.4 tremor that killed 14 people on the island.
Tsunami warning lifted. #Indonesia
At least 37 deaths reported from the latest Lombok quake.
Disaster officials say death toll rises to 82 and thousands of people flee the island of Lombok following the quake.
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More from @W7VOA see all

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New @realDonaldTrump administration’s #Africa strategy being unveiled here by @AmbJohnBolton.
The new #Africa strategy was approved by @POTUS yesterday and the administration "will begin executing (it) immediately," says @AmbJohnBolton.
"We will no longer support unproductive, unsuccessful and unaccountable UN peacekeeping missions," announces @AmbJohnBolton.
Read 22 tweets
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Selection by @POTUS to select Bill Bar as the next attorney general is "a continuation of this law and order presidency," says acting Attorney General @MattWhitaker46.
Barr demonstrated "an unwavering adherence to the rule of law" in his previous tenure as attorney general, says @POTUS in Kansas City speech to law enforcement, saying his intended nominee deserves bipartisan support.
In speech to law enforcement, commenting on congressional races, @POTUS sometimes you choose someone for a position that you think is going to be really good and "they choke like dogs."
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The @POTUS-Xi dinner here was a “highly successful meeting," says @PressSec in statement and the Chinese president, "in a wonderful humanitarian gesture, has agreed to designate Fentanyl as a Controlled Substance."
And @POTUS agreed that on Jan. 1, he'll "leave tariffs on $200 billion worth of product at the 10% rate, and not raise it to 25% at this time," adds @PressSec.
"China will agree to purchase a not yet agreed upon, but very substantial, amount of agricultural, energy, industrial, and other product from the United States to reduce the trade imbalance between our two countries," according to @PressSec.
Read 10 tweets

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M 4.4 - 11km NNE of Decatur, Tennessee earthquake.usgs.gov/earthquakes/ev…
These colored lines show the intensity of ground shaking from the #earthquake. How hard the ground shakes is related to the magnitude of event, the distance from the event and the local geology earthquake.usgs.gov/earthquakes/ev…
So far, 6000+ people have reported feeling this #earthquake via the @USGS. Did you feel it? Let them know 👉 earthquake.usgs.gov/earthquakes/ev…
Read 9 tweets
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(1) #Earthquake near #Anchorage, Alaska in the last hour.

Moderately deep & strong, expect some damage, but loss of life unlikely. Magnitude is usually downgraded from initial level.

Best info source:

earthquake.usgs.gov/earthquakes/ev…
(3) Some photos from around Anchorage that I've seen on Twitter. In New Zealand we have an earthquake of this type about once or twice a year. It is scary, but thankfully little damage is done.

#DropCoverHold is the best advice. More: ready.gov/earthquake
(4) If you feel an earthquake when you're on a beach or within a few miles of the coast, be aware of #tsunami risk.

"If it's long or strong, get gone." There is no time for warning sirens or messages.

If you don't feel it, that means any tsunami is hours away. You have time.
Read 36 tweets
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Good morning from a UK with slightly less dull weather! I want to discuss two topics which are often confused & misunderstood, but first I wanted to clarify a few things from yesterday's threads #earthquake #Stress #faults 1/n
Referring back to the block diagram for dip-slip faults from yesterday, @CriticalStress_ noted that the stress arrows at the top were wrong. All faults have a confining (inward) compressional stress, but stresses from other directions can be larger 2/n
This diagram from @SEELeeds shows that in the example block diagram I gave the smallest stress (sigma-3, min) is inward perpendicular to the fault. The primary stress - the largest amount of force acting on the rock to produce a normal fault - is vertical: GRAVITY! 3/n
Read 31 tweets
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As a further introduction, I thought it might be helpful to have a thread including the primary sources of information for earthquakes around the world & nationally. This will hopefully be useful for those interested in looking up about quakes in the future 1/n
The most often used source for earthquake information is USGS (@USGSted). They locate quakes all over the world, with a more detailed catalogue provided for the US & their associated territories (primarily Puerto Rico). Their website is here: earthquake.usgs.gov/earthquakes/ma… 2/n
To search the database for specific events click on the gear on the top right of the page, then click the button "Search Earthquake Catalog". This will redirect you to a search engine, where you can input magnitude, date & area bounds to search for specific events 3/n
Read 25 tweets
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(1) I will look into the details of this earthquake, since depth and location affect how much damage it did.

The last thing the starving, oppressed people of Venezuela need is a major earthquake.
(2) The first reports of an earthquake's magnitude always gets downgraded about 15-20 minutes later. Currently this one looks to be about 6.8.

Crucially, it's quite deep, at 76 miles (123km).

The USGS website model estimates 10-100 deaths & USD $10 million to $100 million.
(3) If this had been a shallow earthquake, the carnage would be massive. Thankfully it was deep.

There will be many aftershocks. People will be very afraid.

Here's the USGS impact modelling:
earthquake.usgs.gov/earthquakes/ev…
Read 4 tweets
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USGS | M 4.4 tonight 7km NE of Aguanga, CA In the pluton between Elsinore an San Jacinto faults. Thousands of tiny quakes have been occurring here for 2 years. earthquake.usgs.gov/earthquakes/ev…
Magnitude is controlled by the area of fault that moves in a quake. These tiny quakes near Cahuilla are moving very small areas and release only a small amount of strain. Caltech's Hauksson has looked for and not found evidence for associated fluid motion.
Many areas have swarms of small quakes. Sierra Nevada, Imperial Valley, Owens Valley but usually shorter duration. Oregon-Nevada border region had a long swarm 2014-15. This Cahuilla swarm is longest duration in SoCal since we've been able to see small quakes (since 1980)
Read 3 tweets

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