Thursday, March 26, 2015

Replace all your mechanical old clocks with quartz

We, who love old clocks, have waited for this moment.  Who can remember to wind at the exact same time every day?  Even if you do, the time varies wildly with the weather.  The mechanisms are beautiful and I started my path to engineering fixing these things when I was a kid.

That's why you carefully preserve the mechanism for your grandkids to put it back if they want.  They'll soon take it out again.  The new quartz guts have a perfect tone, choice of chimes, volume control and night silence.  All the things you wanted when you first brought one of these things home.

In Canada, choose Craftime Clockery for your quartz mechanism.  All you really have to choose is the shaft length.  For example, this clock was 3/4 inch, and another one was 1/4 inch.  I chose the speaker version, instead of actual striking chimes.  The sound is beautiful.  And you can rely on the time!  And free hands.

ps.  not a penny from these guys -- darn.  I never get anything.  :(

Wednesday, March 25, 2015

Another Texas earthquake whack-a-mole

As we recall in our continuing saga, Texas allows saltwater injection, and has never had earthquakes with this.  But, greed being what it is, the injectors are tempted by the Fruits of Satan, which in this case means gas-frack waste.  They mix it in and are shocked, shocked to get earthquakes.  Then it takes forever for them to secretly own up, and you get a big mess, like up in Dallas.

I'm calling this one to be the next Irving, but the odds are low.  We need a few more earthquakes to be sure.

Update:  Nothing more, just like OK.  Oh well, all these latest micro-hypotheses are going into the can.  :(

Tuesday, March 24, 2015

Oklahoma earthquake storm breaks a new record

Wow, 16 heavy events, and I'm going to bed.  Nothing like that before.

I'm fairly convinced that as a major event starts to homogenize a large fault area, it slides to a critical displacement.  This activates earthquakes all over the zone.  However, the storm earthquakes may actually be activated by the stress relief of the pre-slide.  The large regional stress relief, however, of the major event somehow shuts everything down for a while.  It's sort of a complex anti-process that I can't figure out.

Anyway, tomorrow or the next day we'll have a doozy of an earthquake, and everything will go quiet.  I don't have hard physics on this, but it has been the general pattern.  I still give it 50/50 that it could break out of this pattern and do something else.  Oh well.....

Update:  nothing big to wake up to.  The storm continues.

Update2:  I've decided this is the old concept of dilation, which was really big 30 years ago.  Basically, the rupture plane must yield slowly and homogenize to a uniform small critical displacement.  Then it is ready for a super-rupture.  It is the same with landslides.  With a rough and strong surface, there must be an expansion of the fault surface, which allows in more water.  This can generate electrical signals and tremor, which makes the animals go crazy, or all these storm earthquakes.  Then pow!

Update3:  Dilation was an MIT concept before that whole area died, and the smart people went to Stanford.

Update4:  Wed. has proven to be generally quiet without a large earthquake.  The pattern is breaking, and if there isn't a large earthquake tomorrow, it is six feet under.

Monday, March 23, 2015

An Oklahoma Earthquake 2-4

In Canada we know what a 2-4 is.  It's a case of beer to watch the hockey game!  Good times.

Not so good down there.

These 4's aren't even a penultimate quenching event, they are part of the chatter.  At some point we can have a runaway reaction, but this probably isn't it.

A chatter that includes 4's means that something bigger is coming.  I sure wish they would have sprung for some accelerometers.  Those puny seismometers are just going to bounce out of their cases.

Anyway these events seem to be deep, so nobody should be worried.

Update:  both events are oblique-normal (tension), so not much of a PGV (Intensity).

Update2: Intense chatter close to 4.  Wouldn't want to be around there.

Update3:  Difficult to know the exact physics here.  If I were a young spring chicken with a big computer, I would model it as discrete elements.  Then I would figure out what is the more likely mechanism - that of a large event starting to give a difficult birth and stimulating the storm, or the inverse of the storm giving rise to a big bouncing baby...

Saturday, March 21, 2015

Deep M4.0 Oklahoma earthquake

Nothing to see here, really.  But, I always look on the bright side.  This was a directed strike-slip and I'm calling it deep.  In fact, all the latest significant earthquakes have been deep, ushering in the new phase of depth extension.  This was too small to produce regional stress relief, and an M2.9 happened shortly afterwards.

I've been saying that this mechanism is exactly what happened when New Madrid was a baby.  As long as the earthquakes stay in the upper 5 km, we can only go as high as an M6.  When the events go down to 30 km, then we can get a New Madrid style M7.  Such an event would destroy cheap high-rise condos on swamps all over ENA.  You should live, though.  :)

Update:  Back to a heavy chatter.  The tremor worms are eating away the rock.  :)

Update2:  Yeah, the usgus is back to the beach for M4's.  Somebody must have been surfing.  :)

Almost pure thrust.  At least 10 km deep to spread out the PGV so much.  They don't go below 5 on their very rough calculations.  We're into M6.2 territory now.