As just predicted, early the next day, biggest local quake for a week:
Magnitude 4.2, Thursday, August 4 2011 at 3:08 am (NZST), 20 km east of Christchurch

Port Levy magnitude 4.2 quake - GNS GoogleMap 030811

Port Levy magnitude 4.2 quake - GNS GoogleMap 030811

The effects of this moderate earthquake were felt surprisingly widely, on both the North and the South Island seismographs and either side of the Southern Alps. I will put up analysis pics here ASAP.[1]

For the meantime, we are watching the deep South seismographs – evidence of a forthcoming Fijordland quake is mounting day by day.. with steady motion deep off Kaikoura too. Waitaha Valley is very lively.

NZ GNS seismograph drums 060811

NZ GNS seismograph drums 060811


Note, Southland events like this don’t get recorded on geonet.org.nz Recent New Zealand Earthquakes. Maybe they should.

More later..

2:40am Saturday. Bingo. A noticeable shake on/near? Cashmere Hill – a collapsing feeling with an aural rush:

NZ GNS drums - 060811a

NZ GNS drums - 060811a


Wow this is a moveable feast…
Magnitude 3.7, Saturday, August 6 2011 at 2:40 am (NZST), 10 km south-west of Christchurch
Tai Tapu magnitude 3.7 quake - GNS 060811

Tai Tapu magnitude 3.7 quake - GNS 060811

[1] Against a backdrop of largish 5-6 north Australian plate quakes, including Fiji and Kermadec regions, this was the most obvious and absolutely certain indicator that Christchurch would soon have a felt earthquake, that proved correct – sizable steady motion on the Alpine fault, 2 August at Inchbonnie (top left chart below):

Canterbury seismograph drums - 10:30am 020811b

Canterbury seismograph drums - 10:30am 020811b

..that within two hours had shaken the Inchbonnie seismograph into disorder:
Canterbury seismograph drums - 12:30pm 020811c

Canterbury seismograph drums - 12:30pm 020811c

I have more pics to add soon, that show how the consequent ‘small’ extinct volcano Port Levy 4.2 quake connected with both the deep South and the West Coast (via Alpine fault) and the North Island volcanic zone.[2] CAUTION.

10am Update – we are getting under weigh again:

Kermadec magnitude 5.3 quake - GIM 060811

Kermadec magnitude 5.3 quake - GIM 060811

Ref. quakes.globalincidentmap.com, and Waipu Caves Northland:
Waipu Caves seismograph - GNS 060811b

Waipu Caves seismograph - GNS 060811b


NZ seismograph drums - GNS 060811d

NZ seismograph drums - GNS 060811d

Watch this space.

Off to New Brighton now 😀
Magnitude 3.2, Saturday, August 6 2011 at 9:42 am (NZST), 10 km east of Christchurch

[2] …

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