Monday, April 27, 2015

Linux - Debian turnover, a time of great confusion

Every two years, Debian throws us into a great mess.  It's good to come out the other side.  Namely, I'm talking about the shift of Jessie to stable.  I run testing on one machine, and stable on the other.  Every once in a while, I have mucked things so much that I reinstall from a usb.  Debian loves its Toy Story names, so the install always uses the cutie names.  You have the choice of using the boring generic names.

So now on my testing machine, I have to change 'jessie' to the generic 'testing', since I don't think the new name of 'Stretch' is that established yet.  There weren't too many changes.

But on my 'stable' machine, I changed the name in 'sources.list' from 'Wheezy' to 'Jessie'.  There were thousands of updates, and I had to run 'aptitude upgrade --full-resolver' to try to get it to work.

Oh neat, this update has totally bricked my machine.  Time for a re-install.  blah.  Don't try this at home, kiddies.

Update:  It totally shattered my built-in amd apu graphics, dvi output, which I worked so hard at.  Working on analog.  I can't decide whether the new installer will have this all organized by now.

Update2:  I recompiled a new kernel, adding all the radeon stuff.  dmesg looks good, but no dvi output.  There seems to be no hope to fix this now.  As usual, I'll wait for other people to have this problem.  :)  The standard vga seems better.

Sunday, April 26, 2015

Nepal Earthquake - Aftershocks Shocking

This zone is 200 km long.  A true M8 would be 300 km long.  The footwall is probably to the north, and all the populated areas are on the hanging wall, where all the aftershocks are.  We are lucky the city wasn't in the true 'hammer zone' of the thrust fault.  This happened with the Armenian earthquake, which was only an M7 but the city was on the zone.

Same with Kobe -- an M7 with attitude.  Aftershocks can bring down damaged buildings, and sometimes cause more disasters (remember Christchurch?).  Some of these aftershocks are closer to the populated areas, so the PGV can be higher.

In Toronto, we have a lot of people right on the potential zone.  The chance for a big earthquake here is exactly the same as all these other places, every few hundred years in the same spot.  Oklahoma City may have a slightly greater chance.  :)

Last Toronto Glacier Fading - Victim of Global Warming

Here it is, only almost May, and the last ice is fading.  I took this sad shot today.  We know that some day we'll have kilometres of ice, and we'll all live underground.  Constantly redoing the ice shafts as the glaciers grind over us.  But not this day.

Here is a picture of an Arctic wildflower in Toronto, struggling against the coming heat.  Oh, I know you're going to ask why all the doom and gloom, saying that all the latest scientific papers are destroying Warming, noting that past variability has been underestimated.  I know all that, but I've been cold so long, that I am afraid of thawing.

Oh, somewhere in this favoured land the sun is shining bright,
The band is playing somewhere, and somewhere hearts are light;
And somewhere men are laughing, and somewhere children are swarming,
But there is no joy in Hogtown — Frigid Toronto is warming.

Saturday, April 25, 2015

M7.8 Nepal earthquake - valley thrust supershear

Somewhere I have done a huge thing on blind thrust supershear earthquakes.  I even did a wikipedia on it.  The whole area is under compression because of mountain building.  Then they have these lovely valleys where everybody likes to settle.  But what are they really?  They are the scars of old thrust faults.  Each one goes every few hundred years, but there are a lot of them.  The PGV is record-breaking, if somebody could record it, probably 2 m/s or more.

Friday, April 24, 2015

Vancouver M6.1 walks down the track

This is right down at the bottom of the previous M7ish strike-slip earthquake,  This one is oblique thrust.

The big question is which track?  I am adamant about the buried strike-slip fault that defines the island, and goes way down into Seattle.  This is the real threat to Vancouver, but it is buried under a ton of sediment.  Pooh-pooh on the subduction zone, that is the worst-defined zone on the planet.  Other cities will tumble before this one does anything.

Being adjacent to the old quake, it could be a left-over or the start of the next section.  I make no predictions since my previous extrapolation was assuming the earthquakes were walking North to Alaska.

Just like Oklahoma, we could use some deep imaging here.