soubriquet
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Posts posted by soubriquet
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Thanks mamabear. No1 will be at UWA, and is thinking of moving in with a friend in Nedlands. Say hello if you see him
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Hello sunrise. Nice to hear from you. I hope life and music are treating you well. I know my way around Zao a bit better now. You should come for another visit, but pick a weekend with better weather
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Not at all brit-gob. Time has done its healing. They've grown up, and can and do travel independently to visit.
No1 son has finished school. He's taking a gap year (sensible lad) and will be going to uni next year to study architecture.
No 2 son has been on a mission ever since he started to crawl. He's found that mission and is going to join the RAAF whenever. He's in the cadets and learning to fly. Also all the other stuff: discipline, teamwork, bushcraft, washing ironing and sewing.
They are good lads. I'm very proud of them both.
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Yes, Niigata and offshore tectonics are horribly complicated. You have my sympathy. The only upside is (from memory) the faulting around Niigata is mostly strike-slip, and doesn't build up the strain like the subduction off Miyagi. More smaller earthquakes may not seem like much compensation though.
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I went back last spring to visit my family. Conversation with mum (now aged 94) went like this.
Who are you?
I'm your son.
I didn't know I had a son.
You have two sons.
Who are you..........?
Oh dear. I hope I go before that happens to me.
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AhHa.
Married footballer gets his legover!
According the the Torygraph, the DirtyRottenBounder is no less than Ryan Giggs. I'm shocked. Probably the most important news since the start of WWII, if not worse.
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What celebrities do in the bedroom is of zero interest to me.
For superinjunction read Christopher Booker in the Torygraph.
http://www.telegraph.co.uk/comment/colum...al-workers.html
Civil serpents using state power to interfere in peoples lives, no accountability. Pure State Control.
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Here's where I go, I was standing on the weir. No problem swimming here, but you might upset the locals.
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Yes there are. There's one about 5km from here, with a park and some barbecues. I just go to the local weir to enjoy a beer and dangle my feet in the water on a hot day. There's heaps of fishing.
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I took this on the way home from work yesterday. Chokai San in the distance.
Here's where I live, the valley mid distance. Farms, forests and snow capped mountains.
The rivers are clean too.
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We're about 70km WNW of Sendai, pretty much halfway between each coast. Heaps of aftershocks, probably hourly for at least a month. We felt the Niigata quake, and the really big aftershock off Onagawa came through at 5-, same as the main quake, except we had a lot of ground roll that time. That time the power was only off for a day, and the water for 2.
The memsahib and I regularly count our blessings, and we are truly blessed here. It's a lovely part of the country. The ground is fertile, we get plenty of sun and rain. We don't get big earthquakes or typhoons. The only irritation is the volume of snow, but that's a small thing in the bigger scheme.
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Sendai is a nice city, with probably the best climate in Japan. They're also unlikely to have a big earthquake anytime soon. It seems sensible to me.
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Music 101. Here's Otis Rush fronting a bunch of white stiffs.
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Something different. The Jolly Boys covering Rehab. Lots of booty shaken here, including Errol Flynn's widow. G-G will hate this.
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Oh no. I'll say thanks anyway, because the I'd never really tried to nut out the difference between magnitude and intensity. I've been looking but not seeing.
Think of it this way. At zero seconds, you are standing at a point on the ground. One second later, that point is 3 metres from where you were standing. That's acceleration, and how intensity is measured. Except, the ground isn't moving in one direction, its shaking back and forth, 20 or so times a second. It's going 75mm in one direction, then coming back another 75mm (that's an overestimate, but I'm not going to get into the calculus). M VIII or Shindo 6+.
Shindo starts at zero, not one, hence 10 divisions.
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T-B. He is Willie Dixon. He played bass and guitar, and was a prolific song writer and arranger.
He wrote (for example): "Little Red Rooster", "Hoochie Coochie Man", "Evil", "Spoonful", "Back Door Man", "I Just Want to Make Love to You", "I Ain't Superstitious", "My Babe", "Wang Dang Doodle", and "Bring It On Home". (Wiki)
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A problem with growing up with the music of the 1960s is that it has been downhill since then. Stadium Rock turned me off, and Disco killed it. Nothing will ever match the shock of Jimi Hendrix (who is this guy?) performing Hey Joe on Top of the Pops. I've now settled somewhere in the 1950s.
Something a little more contemporary
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Sugar Pie Desanto shaking her booty in a very interesting way.
A lineup of the great and good.
Sugar Pie Desanto: Vocal
Sunnyland Slim: Piano
Hubert Sumlin: Guitar
Willie Dixon: Bass
Clifton James: Drums
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Tricky questions, grasshopper. I've done some more scratching around and had a bit of a think.
Magnitude is the amount of energy released at the hypocentre. It's interesting from an academic perspective, it's what I covered at uni, but it doesn't tell us much about what is happening on the ground.
Shindo, PGA (Peak Ground Acceleration) and Mercalli scales are measures of acceleration, and are what is important for an engineer to design a structure. I can find wikidata on Shindo and PGA, but I'm having trouble reconciling the numbers.
Shindo 6+ gives a peak acceleration of 3.15–4.00 m/s². The PGA scale gives acceleration in g. Magnitude VIII is 0.35-0.65g, which equates to about 3.3-6.5 m/s². Those numbers are nuts. Sustained over one second we get greater than 3 metres of ground displacement. Fortunately P-wave frequency is about 20Hz, meaning 40 accelerations per second. That gives us something less than 75mm displacement each way per cycle. It's still a lot: no wonder stuff leaps around.
So, I'll requalify M8 as M VIII
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That question has lead to some research and discussion. The memsahib dug up some totally unintelligible equations. My understanding is this (I could be wrong).
Earthquake 1 was Magnitude 9, using the moment magnitude scale, namely the amount of energy released at the hypocentre. Shindo, as you rightly state, is the degree of shaking at a particular location, not the same thing. Shindo only runs to 7, but with the subdivisions (lower/upper) actually has 10 divisions.
I should re-phrase that. This house is built to Shindo 6+ standard. For wooden buildings: "Many, less earthquake-resistant houses collapse. In some cases, even walls and pillars of highly earthquake-resistant houses are heavily damaged." That equates approximately to an M8 earthquake locally.
My point. The house is a steel framed lightweight structure. It is very flexible and well-bolted to the ground. It meets the current standards.
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What's that? Can it do the stairs? I want one.
The Yukios is brilliant. It does about 5 times more work than I can manage, meaning I can clear the shopfront, footpath and parking in around 2 hours.
And down into the magic hole it goes.
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Wow. Thanks. It was scary alright, you are utterly in the lap of the gods, with no idea how big it's going to be, or how long it will last. But truly, the worst part was knowing that right there and then, some poor souls were dying a horrible death.
Anyway, how was everyone's winter? We had about 14 metres of snow, about 2 metres more than average. The memsahib bought me this for Christmas, a snow pusher. Brilliant.
I'm going to buy her a vacuum cleaner for her birthday
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I am a geo, mantas, and 1/6th of my undergraduate degree is geophysics. The course was taught by the renowned Fred Vine, who in addition to being an absolutely top bloke, set the gold standard in clarity and organisation. It was a fascinating course and I was a diligent student. Even after 30 years I still retain the information, so I'm tuned in.
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Hello team. If I promise not to be rude, will you let me stay?
g-g. Earthquakes produce two types of waves directly, and generate a 3rd type when the energy reaches the the Earths's surface. P-waves are pressure waves and are oriented towards and away from the epicentre. S-waves are shear waves and move side-to-side, so to speak. P-waves travel faster than S-waves, so if you are any distance from the earthquake, the first arrival will always throw you towards the origin.
The first earthquake nearly chucked me backwards out of my chair, so I knew it was coming from the east. It went on for a long time, and there was a distinct transition in the motion from P- to S-waves. The duration told me it was a long way off and the magnitude told me it was very very big.
The 3rd type of waves are Rayleigh waves, or ground roll. These are the same as surface waves on the ocean, where a cork describes a vertically oriented circle. Rayleigh waves aren't particularly energetic and they don't travel far, but if you are close to the source, the vertical motion can be very damaging.
Muika describes this perfectly, the first earthquake wobbling around, and the second (closer) up and down. Top marks for excellent observation.
Happy Birthday
in General off-topic discussions
Posted
Nedlands baths used to be a ramshackle timber structure built in the Swan at the end of a long walkway. The water was about 6 feet deep. Everything was covered in barnacles, and my abiding memory was of swimming in jellyfish. That was in about 1958. Tough we were in those days.