Strange seismic waves were picked up circling the globe on November 11. Now seismologists are trying to figure out why

https://www.news.com.au/technology/science/strange-seismic-waves-were-picked-up-circling-the-globe-on-november-11-now-seismologists-are-trying-to-figure-out-why/news-story/31a4e88570f95dfea9e1a0fe7a7daf2e?fbclid=IwAR1aiP15q5TDZwI-llhnt_zkuN1CdaUyz_Tmb2fvNXVwX4M5O8yTKt3hCtk

Strange waves rippled around the world, and nobody knows why
Instruments picked up the seismic waves more than 10,000 miles away—but bizarrely, nobody felt them.

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/?fbclid=IwAR17oLPnLuPRjo42iFF0WWgDE0mBx4vm-WbwA9I3r-Rgdl1w2mtHETCTH7s

Yeah.
None of the proposed explanations seem satisfactory at all.

sarahs mum said:

Strange seismic waves were picked up circling the globe on November 11. Now seismologists are trying to figure out why

https://www.news.com.au/technology/science/strange-seismic-waves-were-picked-up-circling-the-globe-on-november-11-now-seismologists-are-trying-to-figure-out-why/news-story/31a4e88570f95dfea9e1a0fe7a7daf2e?fbclid=IwAR1aiP15q5TDZwI-llhnt_zkuN1CdaUyz_Tmb2fvNXVwX4M5O8yTKt3hCtk

Strange waves rippled around the world, and nobody knows why
Instruments picked up the seismic waves more than 10,000 miles away—but bizarrely, nobody felt them.

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/?fbclid=IwAR17oLPnLuPRjo42iFF0WWgDE0mBx4vm-WbwA9I3r-Rgdl1w2mtHETCTH7s

chinese probably created a mini black hole

dv said:

Yeah.
None of the proposed explanations seem satisfactory at all.

Slow Earthquake seems plausible.

sarahs mum said:

Strange seismic waves were picked up circling the globe on November 11. Now seismologists are trying to figure out why

https://www.news.com.au/technology/science/strange-seismic-waves-were-picked-up-circling-the-globe-on-november-11-now-seismologists-are-trying-to-figure-out-why/news-story/31a4e88570f95dfea9e1a0fe7a7daf2e?fbclid=IwAR1aiP15q5TDZwI-llhnt_zkuN1CdaUyz_Tmb2fvNXVwX4M5O8yTKt3hCtk

Strange waves rippled around the world, and nobody knows why
Instruments picked up the seismic waves more than 10,000 miles away—but bizarrely, nobody felt them.

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/?fbclid=IwAR17oLPnLuPRjo42iFF0WWgDE0mBx4vm-WbwA9I3r-Rgdl1w2mtHETCTH7s

Landslide. A big one. Has a low frequency unlike high frequency waves from normal earthquakes. May be on land or undersea. We’ll know for sure when the origin is pinpointed.

More on the story

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/

The French Geological Survey (BRGM) is closely monitoring the recent shaking, and it suggests that a new center of volcanic activity may be developing off the coast. Mayotte was formed from volcanism, but its geologic beasts haven’t erupted in over 4,000 years. Instead, BRGM’s analysis suggests that this new activity may point to magmatic movement offshore—miles from the coast under thousands of feet of water. Though this is good news for the island inhabitants, it’s irksome for geologists, since it’s an area that hasn’t been studied in detail.

more…

from the same article

Ekström thinks that the events on the morning of November 11 actually did begin with an earthquake of sorts equivalent to a magnitude 5 temblor. It passed by largely unnoticed, he suggests, because it was what’s known as a slow earthquake. These quakes are quieter than their speedy cousins since they come from a gradual release of stress that can stretch over minutes, hours, or even days.

Tau.Neutrino said:

More on the story

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/

The French Geological Survey (BRGM) is closely monitoring the recent shaking, and it suggests that a new center of volcanic activity may be developing off the coast. Mayotte was formed from volcanism, but its geologic beasts haven’t erupted in over 4,000 years. Instead, BRGM’s analysis suggests that this new activity may point to magmatic movement offshore—miles from the coast under thousands of feet of water. Though this is good news for the island inhabitants, it’s irksome for geologists, since it’s an area that hasn’t been studied in detail.

more…

Posted this link in opening post.

sarahs mum said:

Tau.Neutrino said:

More on the story

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/

The French Geological Survey (BRGM) is closely monitoring the recent shaking, and it suggests that a new center of volcanic activity may be developing off the coast. Mayotte was formed from volcanism, but its geologic beasts haven’t erupted in over 4,000 years. Instead, BRGM’s analysis suggests that this new activity may point to magmatic movement offshore—miles from the coast under thousands of feet of water. Though this is good news for the island inhabitants, it’s irksome for geologists, since it’s an area that hasn’t been studied in detail.

more…

Posted this link in opening post.

Opps, I missed it, I saw the news com link.

Apologizes.

I must need new glasses.

Tau.Neutrino said:

sarahs mum said:

Tau.Neutrino said:

More on the story

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/

The French Geological Survey (BRGM) is closely monitoring the recent shaking, and it suggests that a new center of volcanic activity may be developing off the coast. Mayotte was formed from volcanism, but its geologic beasts haven’t erupted in over 4,000 years. Instead, BRGM’s analysis suggests that this new activity may point to magmatic movement offshore—miles from the coast under thousands of feet of water. Though this is good news for the island inhabitants, it’s irksome for geologists, since it’s an area that hasn’t been studied in detail.

more…

Posted this link in opening post.

Opps, I missed it, I saw the news com link.

Apologizes.

I’ll forgive you. :)

Tau.Neutrino said:

sarahs mum said:

Tau.Neutrino said:

More on the story

https://www.nationalgeographic.com/science/2018/11/strange-earthquake-waves-rippled-around-world-earth-geology/

The French Geological Survey (BRGM) is closely monitoring the recent shaking, and it suggests that a new center of volcanic activity may be developing off the coast. Mayotte was formed from volcanism, but its geologic beasts haven’t erupted in over 4,000 years. Instead, BRGM’s analysis suggests that this new activity may point to magmatic movement offshore—miles from the coast under thousands of feet of water. Though this is good news for the island inhabitants, it’s irksome for geologists, since it’s an area that hasn’t been studied in detail.

more…

Posted this link in opening post.

Opps, I missed it, I saw the news com link.

Apologizes.

I missed it too. The underwater volcanic activity makes excellent sense.

“Mayotte is an archipelago in the Indian Ocean between Madagascar and the coast of Mozambique. It’s a department and region of France, though traditional Mayotte culture is most closely related to that of the neighboring Comoros islands.”

An easy location to miss.

So which one of you tipped off the ABC? They have just put this up….

https://www.abc.net.au/news/2018-11-30/ghost-earthquake-ripples-around-the-world/10570572

:)

buffy said:

So which one of you tipped off the ABC? They have just put this up….

https://www.abc.net.au/news/2018-11-30/ghost-earthquake-ripples-around-the-world/10570572

:)

My friend Kym posted the story that caught my attention. (She lives in rural Northern NSW and has a strange noise that happens on her farm. She calls it the land whale.Having recorded it and posted about it for a couple of years she is now thinking it has something to do with a storm water drainage system nearby.)

The Mayotte vibrations took about 40 minutes to reach Britain, and an hour and 15 minutes to reach Hawaii, more than 11,000 miles from their point of origin.

Such low frequency rumbles are rare but not unheard of. Scientists have detected them before after glacier calving, landslides and sudden shifts of magma beneath volcanoes. There are no glaciers near Mayotte and an underwater landslide would have been picked up by hydrophones in the surrounding ocean, said Hicks. That leaves a magma shift somewhere under the seabed as the prime culprit.

Hicks believes magma may suddenly have drained from a volcanic chamber about 10 miles under the seafloor near Mayotte, setting off the deep rumble that spread around the world. While strong enough to be picked up by sensitive seismometers, the vibrations would have been minuscule: far smaller than a millimetre. “It’s something that you wouldn’t perceive,” he said.

Pierre Briole, a geoscientist at École Normale Supérieure in Paris, has reached a similar conclusion. He believes that a third of a cubic mile of magma may have drained from a volcanic chamber under the seafloor, unleashing deep vibrations when its roof collapsed.

Much of the seismic sleuthing played out on social media with professional and amateur scientists working together. “Overall, a fascinating demonstration of open science on Twitter and engagement between scientists and citizen seismologists,” said Hicks.

https://www.theguardian.com/science/2018/nov/30/magma-shift-mysterious-seismic-wave-event-mayotte?CMP=fb_gu&fbclid=IwAR2tSyVv99SeJVXVLam82rx16EiV0umhot_FbJ7OOowqTnlxqXoeZ-h69pA

sarahs mum said:

The Mayotte vibrations took about 40 minutes to reach Britain, and an hour and 15 minutes to reach Hawaii, more than 11,000 miles from their point of origin.

Such low frequency rumbles are rare but not unheard of. Scientists have detected them before after glacier calving, landslides and sudden shifts of magma beneath volcanoes. There are no glaciers near Mayotte and an underwater landslide would have been picked up by hydrophones in the surrounding ocean, said Hicks. That leaves a magma shift somewhere under the seabed as the prime culprit.

Hicks believes magma may suddenly have drained from a volcanic chamber about 10 miles under the seafloor near Mayotte, setting off the deep rumble that spread around the world. While strong enough to be picked up by sensitive seismometers, the vibrations would have been minuscule: far smaller than a millimetre. “It’s something that you wouldn’t perceive,” he said.

Pierre Briole, a geoscientist at École Normale Supérieure in Paris, has reached a similar conclusion. He believes that a third of a cubic mile of magma may have drained from a volcanic chamber under the seafloor, unleashing deep vibrations when its roof collapsed.

Much of the seismic sleuthing played out on social media with professional and amateur scientists working together. “Overall, a fascinating demonstration of open science on Twitter and engagement between scientists and citizen seismologists,” said Hicks.

https://www.theguardian.com/science/2018/nov/30/magma-shift-mysterious-seismic-wave-event-mayotte?CMP=fb_gu&fbclid=IwAR2tSyVv99SeJVXVLam82rx16EiV0umhot_FbJ7OOowqTnlxqXoeZ-h69pA

> an underwater landslide would have been picked up by hydrophones in the surrounding ocean

That I wasn’t expecting. There are underwater hydrophones between Madagascar and Africa?

> He believes that a third of a cubic mile of magma may have drained from a volcanic chamber under the seafloor, unleashing deep vibrations when its roof collapsed.

Nice work.