Canterbury Earthquakes

[Richard]

Just to mention, I've been noticing those very-low-pitched rumbling sounds again the last two or three nights...

What do you put that down to Orion

[Orion]

Just to mention, I've been noticing those very-low-pitched rumbling sounds again the last two or three nights...

What do you put that down to Orion

This kind of thing:
http://en.wikipedia.org/wiki/The_Hum
The description of it as sounding like a 'distant idling diesel engine' is perfect. I've noticed it half a dozen times over the last two years.
I happen to be among those who have heard the 'rustling silk' sounds associated with an aurora, so *shrugs* who knows?

[Storm Struck]

Just to mention, I've been noticing those very-low-pitched rumbling sounds again the last two or three nights...

I know what you mean, sounds like an iddling truck quietly sitting next to your house except theres the pressure in your ears that changes with it.
No actual shake but its recognised enough to know its seismic related and not a nearby vehicle or plane as im used to these sounds being in a flight path and all, but perhaps in the 1.8-2.8 magnitude range.
Weve had a few local 2.9-3.3 shakes and although they are small they make alot of noise and rattle the house somewhat.
I think we are easing up from the shakes which is nice but i think there will still be times over the next 10 years when a 5 plus will hit again forming a small reaction of further 3-4 mags for awhile then settle again.
Most regions generally seem to do this over quite some time after a big shake series, especially more so for a region that really hasnt had so many earthquakes over a short period of time and over 6 magnitude.

There was actually a 4.7 magnitude about 60km east of Christchurch a few Saturdays ago i think it was the 18th, 33km deep but still fairly close to the bay.
It was listed on the NZ quake map site, didnt feel it myself though last one i felt was about 2 weeks ago.

[Orion]

A link here to a fascinating survey of observed phenomena in connection with the September 4 2010 earthquake:

http://www.rebuildchristchurch.co.nz/bl ... re-a-quake

[Richard]

Fascinating reading alright

[Richard]

On the way home from CHCH National radio reported that there was a 4.2 5km north of Oxford at 20km deep but nothing shows on GeoNet,Canterbury Quake Live and quakemap about it ...odd!!

[David]

On the way home from CHCH National radio reported that there was a 4.2 5km north of Oxford at 20km deep but nothing shows on GeoNet,Canterbury Quake Live and quakemap about it ...odd!!

That was this one http://geonet.org.nz/quakes/2012p673624
Initial estimates had it further north and larger at 4.2

[Richard]

Oh ok thanks David,i didnt end up getting home till 8.00,so they must have changed it before hand

[Storm Struck]

Geo Net has recently just updated thier website and they are having trouble getting the initial preliminary details right, i was surprised when it showed up on my facebook feed as 4.0 near oxford i thought hang on i didnt feel a thing.
But when i had a look at the drums i could see it was much smaller then that, and so it was then down graded correctly to 3.2 QEll area.

This is an interesting article posted the other day.
http://www.stuff.co.nz/the-press/news/c ... n-the-move

[Orion]

Yes, Jason, I read that article about Canterbury still creeping around. Interesting, alright.

It looks like the Montalto Fault may have given another shrug:

Canterbury Quake Live

Magnitude : 2.76
Date Time : 6 Sep 2012 7:55pm
Depth : 24.46 km
Address : Rangitata Terrace Rd, Ruapuna 7775, New Zealand

[Storm Struck]

Shes off again was sitting down having lunch and had a moderate shake more long wobbling than anything, followed 40 minutes later by another smaller one.
4.3 10km NE of Kaiapoi at 1:35pm
3.6 10km East of Spencerville at 2:01pm

Im hoping we are not building again its been very quiet the past few months, although there have been alot of 2's and low 3's across the region since i felt a small 3.4 on Tuesday night and yesterday there was a 3.7 up at Darfeild.

[NZ Thunderstorm Soc]

A bit of a rumbly wobble and quiver at 10:45pm this evening (3.9M @ 6 odd kms near Springston) but nothing really substantial here apart from as it was the first felt earthquake felt since the ones in July. Never felt the one on Friday?

[bmo]

Was sitting down and the doors just started dancing (well sort of...) First one felt in a long time.

[03Stormchaser]

Quake woke me up this morning, cant be use to them again as I use to sleep thru them all!

[03Stormchaser]

Less than 1% now for a biggie

There is less than a one in a hundred chance of a magnitude-7.0 or higher earthquake hitting Canterbury in the next year, latest forecasts show.

GNS Science has released its latest quake forecasts for the Canterbury aftershock region, which show the probability of significant aftershocks have steadily declined since January.

In the year to October 9, 2013, there is less than a 1 per cent probability of a magnitude-7.0 quake or higher. This is down from a 1 per cent probability forecast last month.

There is a 3 per cent probability of a magnitude-6.5 to 6.9 aftershock, which is unchanged from August. This is down from a predicted 4 per cent probability last January.

There is a 9 per cent probability of a magnitude-6.0 to 6.4 aftershock, which is unchanged from September and down from 13 per cent in January.

There is a 30 per cent probability of a magnitude-5.5 to 5.9 aftershock, down 1 per cent from August. This is down from a predicted 39 per cent in January.

There is a 71 per cent probability of a magnitude-5.0 to 5.4 aftershock, compared with 72 per cent in August and 82 per cent in January.

GNS Science, which reviews its quake forecasts every month, noted that the calculations were for the entire aftershock zone and not just Christchurch

http://www.stuff.co.nz/the-press/news/c ... -forecasts

[NZ Thunderstorm Soc]

Nice wee thump here at 2136hrs. Woke the cat up
Edit: I see they can't make their mind where it was, 3 locations so far around here and alteration of depth and magnatude.

[NZ Thunderstorm Soc]

Re the above. It's annoying that on the Geonet website they haven't registered this earthquake as I want to file a report on it
Whatdoyado?

[Orion]

http://felt.geonet.org.nz/unlisted

Hope that link is helpful.

[Orion]

P.S. They seem to have some record of it:
http://beta.geonet.org.nz/quakes/region ... 012p830699

[NZ Thunderstorm Soc]

P.S. They seem to have some record of it:
http://beta.geonet.org.nz/quakes/region ... 012p830699

Not on their official website but I''ll send in a report from this. Thankyou.

[Skywatcher]

Choose the "All" option on the bar along the top instead of "Felt". It's also easier if you set the Region to just Canterbury.

Doing that takes you here: http://www.geonet.org.nz/quakes/region/canterbury/all

[NZ Thunderstorm Soc]

Shuttery earthquake at 5:36pm here this evening. Not strong but noticable.

[NZ Thunderstorm Soc]

To end the year off, we have had 2 significant rumbles plus a bit of a shake at the end, today and yesterday.
Only 3 odd on the Richter Scale but something significant to mention here.

[NZ Thunderstorm Soc]

Just had a jolly good shake. First one substantal for yonks
Near Rolleston at about 10kms deep with a magnatude of 4.7 on the Richter Scale.

[Skywatcher]

A 4.6 (now reviewed) - strongest one in the region in 6 months.