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Author Topic: Earthquakes and Volcanoes  (Read 7976 times)

bing101

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Re: Earthquakes and Volcanoes
« Reply #25 on: February 14, 2021, 09:45:07 PM »

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bing101

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Re: Earthquakes and Volcanoes
« Reply #26 on: March 04, 2021, 08:11:33 PM »

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triplemultiplex

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Re: Earthquakes and Volcanoes
« Reply #27 on: March 08, 2021, 11:25:48 AM »

https://www.sfgate.com/bayarea/article/New-Zealand-earthquake-8-1-Kermadec-Islands-16001067.php
New Zealand is reporting an 8.1 quake.

Fortunately for New Zealand, this one didn't occur under them but several hundred miles north.
It did cause a tsunami watch for Hawaii, but fortunately, it wasn't big enough to cause anything noticeable.  I think I read the buoy system detected a 3 cm wave.
Those underwater quakes can be tricky.  Usually you need a mid to upper 8 or larger for there to be enough movement to cause a tsunami.  Unless the quake triggers an underwater landslide, in which case the threshold of earthquake magnitude to worry about a tsunami is a lot lower.
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Re: Earthquakes and Volcanoes
« Reply #28 on: March 15, 2021, 02:48:26 PM »

Recent activity here in Wichita, KS

03/14/2021 @ 06:29 — magnitude 3.4
03/14/2021 @ 06:31 — magnitude 3.5
03/14/2021 @ 07:02 — magnitude 3.0
03/14/2021 @ 08:30 — magnitude 2.4
03/14/2021 @ 18:08 — magnitude 3.9
03/14/2021 @ 22:01 — magnitude 1.8
03/15/2021 @ 08:52 — magnitude 3.1
03/15/2021 @ 08:59 — magnitude 3.2

My dad's bathroom light bulb broke from the second one while he was on the toilet Sunday morning, and some friends of ours now have a buckled front porch with boards that won't fit back into place.

All the tremors have been located 5 km underground, and all within a half-mile of Charles and David Koch's property.  So, as I figure it, Charles Koch must be digging a hole to the center of the earth.  It's the only explanation.
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triplemultiplex

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Re: Earthquakes and Volcanoes
« Reply #29 on: March 15, 2021, 05:16:06 PM »

They do much fracking near Witchita?  I don't recall how far north those gas fields in Oklahoma extend.
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kphoger

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Re: Earthquakes and Volcanoes
« Reply #30 on: March 15, 2021, 05:19:57 PM »

They do much fracking near Witchita?  I don't recall how far north those gas fields in Oklahoma extend.

https://www.kwch.com/2021/01/05/geologist-explains-possible-cause-of-wichita-earthquakes/
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Bruce

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Re: Earthquakes and Volcanoes
« Reply #31 on: May 04, 2021, 06:45:54 PM »

The early warning system for earthquakes (ShakeAlert) now covers Washington, Oregon, and California.

WA was just activated today, so we can all get system alerts on our phones if an earthquake is detected. https://www.seattletimes.com/seattle-news/science/cellphone-earthquake-alerts-debut-in-washington-with-a-catch/

This is what an alert would look like on an Android phone:

bing101

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Re: Earthquakes and Volcanoes
« Reply #32 on: July 02, 2021, 01:09:30 PM »

https://www.nbcnews.com/news/world/mass-evacuation-underway-philippines-raises-danger-level-taal-volcano-n1272881


Taal Volcano faces a new eruption threat. Previously Taal had an eruption in 2020.
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triplemultiplex

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Re: Earthquakes and Volcanoes
« Reply #33 on: July 02, 2021, 03:02:22 PM »

Taal is some interesting geography.  It's like island-ception with an island in a lake on an island in a lake on an island in the ocean.
 :crazy:
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bing101

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Re: Earthquakes and Volcanoes
« Reply #35 on: July 09, 2021, 04:40:49 PM »

Here is the fallout of the Mono County quake

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Re: Earthquakes and Volcanoes
« Reply #37 on: September 19, 2021, 04:26:32 PM »

Cumbre Vieja in La Palma (Canary Islands, Spain) has started erupting earlier today. This was preceded by an earthquake swarm over the last few days, as it's usual with volcanoes that are about to erupt. Don't worry, there's no risk of part of that island collapsing into the ocean and triggering a mega-tsunami that would destroy most of the East Coast (that is impossible to happen).
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Re: Earthquakes and Volcanoes
« Reply #38 on: September 19, 2021, 05:29:24 PM »

Cumbre Vieja in La Palma (Canary Islands, Spain) has started erupting earlier today. This was preceded by an earthquake swarm over the last few days, as it's usual with volcanoes that are about to erupt. Don't worry, there's no risk of part of that island collapsing into the ocean and triggering a mega-tsunami that would destroy most of the East Coast (that is impossible to happen).

It would be a very 2021 thing if it happened, though. ;)
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Re: Earthquakes and Volcanoes
« Reply #39 on: September 19, 2021, 10:42:41 PM »

Undersea quakes, volcanoes and landslides are all about displacement of water. If it's a slip fault that goes, the displacement will be minimal. If it's a thrust fault like off Indonesia in 2004, that's a heap of trouble. Landslide tsunamis tend to be localized but can cause great damage.
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triplemultiplex

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Re: Earthquakes and Volcanoes
« Reply #40 on: September 30, 2021, 03:51:04 PM »

After a few months of quiescence, Kilauea is burping up more lava again.  It's all within the main crater so it ain't going anywhere, but still interesting because it shows how restless that volcano is.  It's been erupting for the vast majority of my life with only two breaks in the action.
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SectorZ

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Re: Earthquakes and Volcanoes
« Reply #41 on: September 30, 2021, 06:02:01 PM »

Cumbre Vieja in La Palma (Canary Islands, Spain) has started erupting earlier today. This was preceded by an earthquake swarm over the last few days, as it's usual with volcanoes that are about to erupt. Don't worry, there's no risk of part of that island collapsing into the ocean and triggering a mega-tsunami that would destroy most of the East Coast (that is impossible to happen).

I didn't realize until reading up moments ago about all the contradictory modeling about the effect of a tsunami around the Atlantic coastline if the collapse of the volcano were to occur.

I guess the east coast of the US is safe from a mega-tsunami, but a 1-2m tsunami along the entire coast would still cost billions in damage. I think it was quite overlooked that you had 1 death and $100M in damage in California from the tsunami from the 2011 Japan quake.

Hopefully none of us will live thru the answer as to what will possibly happen. Meanwhile I'll take solace in my 170' ASL and 25 miles inland location.
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Re: Earthquakes and Volcanoes
« Reply #43 on: December 20, 2021, 07:03:45 PM »

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triplemultiplex

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Re: Earthquakes and Volcanoes
« Reply #44 on: January 07, 2022, 06:18:31 PM »

That La Cumbre Vieja eruption mentioned upthread lasted 86 days and did a ton of damage to the western flank of the island, but also added land to La Palma.  It's the longest eruption in recorded history for the island dating back like a thousand years.  Since no one got killed or hurt and the lava moved slow enough for everyone to get their shit out of harm's way, it was about as good as it gets for a billion dollar disaster.
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Re: Earthquakes and Volcanoes
« Reply #46 on: January 17, 2022, 12:59:40 AM »

The eruption was captured by satellites and basically decimated its island (not a populated one, mind you):


The tsunami made its way across the Pacific and killed 2 people in Peru and forced a few rescues in the U.S. People didn't take the hours of advance warning seriously.

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Re: Earthquakes and Volcanoes
« Reply #47 on: January 17, 2022, 09:06:42 PM »

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Re: Earthquakes and Volcanoes
« Reply #48 on: January 19, 2022, 11:22:05 PM »

This was a fascinating eruption. Not only was the erupted ash visible on satellite, but so was the shockwave that was sent out in all directions (and was heard as far away as Alaska). The pressure wave was observed on barometers around the world - in many cases twice over, the second time from the opposite direction.

Pending further analysis, this was likely the largest eruption this planet has seen this century, and could be the biggest since Mt. Pinatubo erupted in the Philippines in 1991. Although the tsunami generated was not particularly large in most cases, it is probably the most significant volcanic tsunami in over 100 years (most tsunamis are generated by large earthquakes).

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