As I'm sure you all know an undersea volcano, near Tonga, erupted yesterday - hopefully the local people are OK, not much news getting out.
One thing which I found most interesting was the atmospheric pressure change it caused. For Xmas I bought both myself and my Melbourne based son a weather station and its pressure chart for yesterday is most interesting:
The blip occurs between 7pm and 8pm AEDT. the volcano erupted at 3.30pm AEDT, I assume the delay is caused by the time taken for the pressure wave to travel the 4200km to my son's home.
What I'm not completely sure about is the negative excursion of the blip; I think this is normal overshoot around set-point when a system is disturbed but I'd be most interested to hear other opinions.
We have a subterrainian volcano, 8km from us. It is deep. If you stand on top of Georges Mountain, at certain times of the month, you can feel the tremors, and very distinctively hear the loud rumble. The volcano is 14 km deep, and it last erupted 7000 years ago. One day it will go pop, and devastate our town and us, if we are still around, which would account for why we cannot get earthquake insurance protection here. As it is I live on the side of another one, only 100mts from the top, it let go 9000 years ago, so it might go off too.,.
-- Edited by Bicyclecamper on Sunday 16th of January 2022 07:08:44 PM
Collo said
07:25 PM Jan 16, 2022
That's easy.....it's called my wife!!!
Collo.
Rob Driver said
07:27 PM Jan 16, 2022
That is interesting Mike H.
Probably worth some investigation
I am thinking possibly caused by a massive blast of C02 and other gases extending high into the atmosphere and creating a low pressure situation at sea level or at least at lower levels.
It is a great event for the global warming enthusiasts.
iana said
08:21 PM Jan 16, 2022
Are you sure you didn't just pass wind at that moment ?
dorian said
07:36 AM Jan 17, 2022
What is the time base on the chart?
Mike Harding said
09:05 AM Jan 17, 2022
dorian wrote:
What is the time base on the chart?
One day, midnight to midnight.
Rob Driver said
09:42 AM Jan 17, 2022
Mike, your son was only next door compared to this report.
Approx 5 hours to Melbourne and 14 odd hours later in ENGLAND
-- Edited by Rob Driver on Monday 17th of January 2022 09:46:28 AM
Buzz Lightbulb said
12:21 PM Jan 17, 2022
It is typical for an explosion to affect the air pressure due to the shock wave. One can see the shock wave spreading out from the vocanic explosion.
Waves have peaks and troughs. The peak in atmospheric pressure may have been caused by the air being displaced by the sudden release of pressurised gas and volcanic matter. The trough is caused by the air pressure balancing out the sudden pressure increase.
dorian said
12:36 PM Jan 17, 2022
If the pressure wave took 3.5 hours to travel 4200km, that's a velocity of 1200 kph. The speed of sound is 1235 kph at 20C.
Mike Harding said
01:41 PM Jan 17, 2022
Rob Driver wrote:
Mike, your son was only next door compared to this report.
Approx 5 hours to Melbourne and 14 odd hours later in ENGLAND
An excellent catch Rob!
Dorian: I believe Tonga to the UK is 16,000km so the wave speed is similar to the Melbourne detection.
Rob Driver said
01:54 PM Jan 17, 2022
It may be only my personal observation but we currently are in an area that has prolific bird life.
Because we have been here for a while I have come to notice their regular activities of a morning and night, and of the pecking order of some of the different breeds.
All in all it is quite interesting to me.
What I noticed on the morning of the eruption that the black co(katoos that are always picking figs and the lorrokeets who are very vocal when feeding, were very quiet. There was little to no activity at all.
In the evening the lorrokeets were back although a lot quieter or maybe less numbers than usual and the black co(katoos did not come back at all on the day and they were there this morning but only in small numbers.
I do believe that some fish feeding habits change with barometer pressure as well as moon phases
Anyway my raving on probably means nothing but these major changes in our earth may have some affect on many animals and their regular habits.
Mike Harding said
02:01 PM Jan 17, 2022
Without question Rob.
I have often observed changes in animal behaviour long before a major weather event. I suspect our long history of building shelters and storing food has caused us to lose many of the senses needed for such presence
However it is clear people who live in the country have a far better sense of the weather than do town's people. I think our senses adjust to suit our surroundings.
Rob Driver said
09:16 AM Jan 18, 2022
Mike Harding wrote:
Without question Rob.
I have often observed changes in animal behaviour long before a major weather event. I suspect our long history of building shelters and storing food has caused us to lose many of the senses needed for such presence
However it is clear people who live in the country have a far better sense of the weather than do town's people. I think our senses adjust to suit our surroundings.
Hi Mike,
Further to our observations I notice this morning that the black co katoos have still not come back.
I also have a family of magpies who before the eruption, would come to my lawn of a morning after the auto sprinkler turns off, and peck around for insects etc but have not been here at all.
It is the same with the lorrokeets where they are in a lot less numbers and they are not in their usual palms eating from the seed pods.
I had the opportunity yesterday to talk to a couple of long termers (from NQ) from my area and they say that those co katoos know when a cyclone is coming and all fly inland to the other side of the ranges.
My daughter showed me pictures of the red sky that was evident in Cairns yesterday morning. Apparently it was volcanic dust. I did not notice the same effect a bit further south at the Whitsundays.
I find this interesting, I wonder have any members noticed similar behaviour with animals or even their pets since the event.
-- Edited by Rob Driver on Tuesday 18th of January 2022 09:18:53 AM
dogbox said
10:20 AM Jan 18, 2022
Mike Harding wrote:
Without question Rob.
I have often observed changes in animal behaviour long before a major weather event. I suspect our long history of building shelters and storing food has caused us to lose many of the senses needed for such presence
However it is clear people who live in the country have a far better sense of the weather than do town's people. I think our senses adjust to suit our surroundings.
i little off topic but not far ,lived in an area that was on a fault zone (earth quakes) we had a chandelier that would start to sway occasionally, you could not notice any movement thru your body but it would be enough to make the chandelier move . so we have probably been desensitized to a lot of warning sign that animals pick up
Buzz Lightbulb said
11:38 AM Jan 18, 2022
One notices earthquakes more when sitting down. One's balance automatically filters out some movement when standing up.
Buzz Lightbulb said
11:45 AM Jan 18, 2022
This is a bit more off topic but when Rob mentioned 'pecking order' it reminded me of bird species when using the bird bath outside our bedroom window.
I general, larger birds take priority except for PeeWees ( Mud Larks or whatever you call them), they only seem to give way to Ravens and Currawongs. All the others they just pester the birds until they leave. The PeeWees sometimes even attack the Currawongs. Feisty little devils.
As I'm sure you all know an undersea volcano, near Tonga, erupted yesterday - hopefully the local people are OK, not much news getting out.
One thing which I found most interesting was the atmospheric pressure change it caused. For Xmas I bought both myself and my Melbourne based son a weather station and its pressure chart for yesterday is most interesting:
What I'm not completely sure about is the negative excursion of the blip; I think this is normal overshoot around set-point when a system is disturbed but I'd be most interested to hear other opinions.
How to detect volcanos from your armchair :)
We have a subterrainian volcano, 8km from us. It is deep. If you stand on top of Georges Mountain, at certain times of the month, you can feel the tremors, and very distinctively hear the loud rumble. The volcano is 14 km deep, and it last erupted 7000 years ago. One day it will go pop, and devastate our town and us, if we are still around, which would account for why we cannot get earthquake insurance protection here. As it is I live on the side of another one, only 100mts from the top, it let go 9000 years ago, so it might go off too.,.
-- Edited by Bicyclecamper on Sunday 16th of January 2022 07:08:44 PM
That's easy.....it's called my wife!!!
Collo.
Probably worth some investigation
I am thinking possibly caused by a massive blast of C02 and other gases extending high into the atmosphere and creating a low pressure situation at sea level or at least at lower levels.
It is a great event for the global warming enthusiasts.
One day, midnight to midnight.
Mike, your son was only next door compared to this report.
https://www.itv.com/news/anglia/2022-01-16/hunga-tonga-volcano-eruption-causes-air-pressure-waves-in-east-of-england
Approx 5 hours to Melbourne and 14 odd hours later in ENGLAND
-- Edited by Rob Driver on Monday 17th of January 2022 09:46:28 AM
It is typical for an explosion to affect the air pressure due to the shock wave. One can see the shock wave spreading out from the vocanic explosion.
Waves have peaks and troughs. The peak in atmospheric pressure may have been caused by the air being displaced by the sudden release of pressurised gas and volcanic matter. The trough is caused by the air pressure balancing out the sudden pressure increase.
An excellent catch Rob!
Dorian: I believe Tonga to the UK is 16,000km so the wave speed is similar to the Melbourne detection.
Because we have been here for a while I have come to notice their regular activities of a morning and night, and of the pecking order of some of the different breeds.
All in all it is quite interesting to me.
What I noticed on the morning of the eruption that the black co(katoos that are always picking figs and the lorrokeets who are very vocal when feeding, were very quiet. There was little to no activity at all.
In the evening the lorrokeets were back although a lot quieter or maybe less numbers than usual and the black co(katoos did not come back at all on the day and they were there this morning but only in small numbers.
I do believe that some fish feeding habits change with barometer pressure as well as moon phases
Anyway my raving on probably means nothing but these major changes in our earth may have some affect on many animals and their regular habits.
Without question Rob.
I have often observed changes in animal behaviour long before a major weather event. I suspect our long history of building shelters and storing food has caused us to lose many of the senses needed for such presence
However it is clear people who live in the country have a far better sense of the weather than do town's people. I think our senses adjust to suit our surroundings.
Hi Mike,
Further to our observations I notice this morning that the black co katoos have still not come back.
I also have a family of magpies who before the eruption, would come to my lawn of a morning after the auto sprinkler turns off, and peck around for insects etc but have not been here at all.
It is the same with the lorrokeets where they are in a lot less numbers and they are not in their usual palms eating from the seed pods.
I had the opportunity yesterday to talk to a couple of long termers (from NQ) from my area and they say that those co katoos know when a cyclone is coming and all fly inland to the other side of the ranges.
My daughter showed me pictures of the red sky that was evident in Cairns yesterday morning. Apparently it was volcanic dust. I did not notice the same effect a bit further south at the Whitsundays.
I find this interesting, I wonder have any members noticed similar behaviour with animals or even their pets since the event.
-- Edited by Rob Driver on Tuesday 18th of January 2022 09:18:53 AM
i little off topic but not far ,lived in an area that was on a fault zone (earth quakes) we had a chandelier that would start to sway occasionally, you could not notice any movement thru your body but it would be enough to make the chandelier move . so we have probably been desensitized to a lot of warning sign that animals pick up
One notices earthquakes more when sitting down. One's balance automatically filters out some movement when standing up.
This is a bit more off topic but when Rob mentioned 'pecking order' it reminded me of bird species when using the bird bath outside our bedroom window.
I general, larger birds take priority except for PeeWees ( Mud Larks or whatever you call them), they only seem to give way to Ravens and Currawongs. All the others they just pester the birds until they leave. The PeeWees sometimes even attack the Currawongs. Feisty little devils.