Been a few south of you recently. A good thing is each releases stress, rather than building up.

If you have an Android phone did you get the new earthquake alert?

I don't have a phone. Someone else may.

tdgeek:

 

Been a few south of you recently. A good thing is each releases stress, rather than building up.

 

You'd need 33,000 magnitude 4 quakes to release the energy of one magnitude 7 quake, and that m4 quake on a major fault system might release a bit of stress in one spot, but it's just getting transferred to another spot.

Or worse, like the Chch quakes, you get a sequence of damaging quakes from a blind fault system that hadn't given anything more than a few clues over 150 years that it might exist.

Here's something from Geonet mentioning the quake you felt, possibly being a consequence of a slow-slip earthquake event.

 

Although humans can’t feel the slow-slip event itself, earthquakes associated with slow-slip events might be felt. A magnitude 4.2 earthquake near Waipukurau over the weekend is likely related to the slow-slip as it is similar to small earthquakes that tend to occur during these events.

 

https://www.geonet.org.nz/news/ZQbec0zqX4NYBlj92g88u

You've moved about 20mm East over a few days apparently - but probably didn't really notice.

Fred99:

 

Here's something from Geonet mentioning the quake you felt, possibly being a consequence of a slow-slip earthquake event.

 

It felt pretty fast to me.

Rikkitic:

 

Fred99:

 

Here's something from Geonet mentioning the quake you felt, possibly being a consequence of a slow-slip earthquake event.

 

 

It felt pretty fast to me.

 

That was probably just a bump on the road.

That bump sent my cats screaming to the next room.

Rikkitic:

 

That bump sent my cats screaming to the next room.

 

Prozac for pets is a thing these days, apparently, though I'm baffled by it.

Fred99:

 

 

 

Prozac for pets is a thing these days, apparently, though I'm baffled by it.

 

 

 

Stop taking it then? :)

Rikkitic:

 

Fred99:

 

Here's something from Geonet mentioning the quake you felt, possibly being a consequence of a slow-slip earthquake event.

 

 

It felt pretty fast to me.

 

I think @Fred99 is saying that the earth surface movement occurs before? or after? the quake. So there's a bump as the initial stress is released down in the bedrock, and the the stress passes to the viscous stretchy slippy layers above, which gradually over the next few days adjust and eventually the surface moves.

Or imagine a thick jelly on a layer of rice bubbles on a tray. If you tilt the tray a little, the jelly tilts a little, but the rice bubbles don't move. Tilt it a little bit more, and the jelly moves a little bit more, but the rice bubbles don't. Tilt it a bit further and maybe a few rice bubbles will roll, or the jelly will roll over them. In this case, the surface movement happens before the rice bubble quake.

Probably best explained in the youtube video from the link about the current slow-slip event:

The 4.2 quake (and others kind of randomly dotted in the region) was probably from stress changes in the shallow crust above where the pacific plate is subducting. IOW not on "the" main fault at the plate boundary - where the slow-slip event is right now releasing massive amounts of energy very slowly and harmlessly.  If instead it was "locked" where it's now a slow slip event, then eventually there'd be a very large quake in that area.  However, because the slow slip events are happening in different locations - but probably not evenly and completely along the boundary, a very large quake may happen sometime when those more locked section(s) "let rip".  Or maybe not.  They only really "discovered" these slow slip quakes a couple of decades ago, using the data they're now collecting probably won't have much use in quake forecasting until after something big happens.  There's plenty to show that big things happened in the past (paleotsunami evidence), but while that's showing there have been frequent large tsunamis, matching those to a local (or distant) EQ event (or volcanic event, undersea landslip - or something else like a meteor impact event) really isn't possible.