texan
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6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 3:54 am

Struck just a few minutes ago near Taupo. We were rocking a ton here in Wellington. Plus 2 aftershocks I've felt so far. No reports from Taupo yet. Depth of 150 km.

Melbourne, Australia was also hit by a 4.4 quake today.

Texan
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QANTAS077
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:01 am

felt the earth move here in Melbourne.
 
baroque
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:42 am

Quoting texan (Thread starter):
No reports from Taupo yet. Depth of 150 km.

That depth is consistent with the location assuming it is close to the Benioff zone. But very surprising you felt it so much, that is pretty deep. Wonder if there was a related fracture that was shallower. Something is a bit odd. Lots of 5 and 6 quakes in the N of Java, but you never feel them because they are over 100 km deep.
 
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 5:28 am

Quoting Baroque (Reply 2):
Quoting texan (Thread starter):
No reports from Taupo yet. Depth of 150 km.

That depth is consistent with the location assuming it is close to the Benioff zone. But very surprising you felt it so much, that is pretty deep. Wonder if there was a related fracture that was shallower. Something is a bit odd. Lots of 5 and 6 quakes in the N of Java, but you never feel them because they are over 100 km deep.

They even felt it on the South Island. But it was hardly felt on the western side of either island. Apparently something about the volcanic zone absorbing most of the energy. The reports I'm hearing said it measured up to a 5.0 in Wellington and as a high 4 in Nelson.

Texan
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baroque
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 5:45 am

Quoting texan (Reply 3):
But it was hardly felt on the western side of either island. Apparently something about the volcanic zone absorbing most of the energy. The reports I'm hearing said it measured up to a 5.0 in Wellington and as a high 4 in Nelson.

Something odd! Have a look at the map from the USGS
http://earthquake.usgs.gov/earthquak...i/events/us/c0004n71/us/index.html
The "Did you feel it" shows it stronger in Wellington than further N and as you say, the W must have been fast asleep or perhaps drunk.
 
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NZ107
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 5:54 am

Quoting Baroque (Reply 4):
The "Did you feel it" shows it stronger in Wellington than further N and as you say, the W must have been fast asleep or perhaps drunk.

Haha. Nothing felt here in Auckland at all. It is interesting being quite deep though - Maybe it was amplified by the volcanic zone in similar fashion to the 6.3 in Christchurch in Feb.

I really hate this Mercalli scale.. But you've also got a bigger population as you move away from the Central Plateau.
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 8:57 am

Quoting texan (Thread starter):
Melbourne, Australia was also hit by a 4.4 quake today.

Quite a strong for a tremor from all accounts, I work in the CBD, and didn't feel it, but a couple of the guys on my floor who sit near the corners felt it. The first I heard of the tremor was getting an email from colleagues based out at Box Hill, apparently they copped some shaking of desks & computer monitors. No reports of damage luckily.

http://www.theage.com.au/environment...psland-suburbs-20110705-1gzzf.html
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 9:02 am

Quoting texan (Thread starter):
Melbourne, Australia was also hit by a 4.4 quake today.

Didn't feel a thing. Only heard about it on the radio while driving home.
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 2:18 pm

Often deeper earthquakes are felt further away from the epicenter than shallow earthquakes.
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EDICHC
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 2:27 pm

Felt the 6.5 from Taupo (well 30 km west of) down here in CHC as a very minor tremor. At 150 km deep was never likely to cause much in the way of damage.

Don't understand the fuss in MEL though, a 4.4mag admittedly only 2km deep but with an epicentre approx 100km away is nothing really. We are still getting shallow 4+ mag tremors here almost weekly often 10km or less from the city and they hardly merit comment, it's only above mag 5 when folks here really start to take notice. I guess for those near the epicentre it would have given the buildings there a fair jolt though.

Quoting NZ107 (Reply 5):
I really hate this Mercalli scale

But it is a better example of local perception of a quake. Most people just look at a news report and read the magnitude, but the magnitude means nothing in isolation. Depth, proximity to the epicentre and subsurface are all significant factors. That's why the Feb 22 quake of 6.3 mag was much more destructive than the Sept 4 quake of 7.1 mag.
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baroque
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 3:53 pm

Quoting EDICHC (Reply 9):
Don't understand the fuss in MEL though, a 4.4mag admittedly only 2km deep but with an epicentre approx 100km away is nothing really. We are still getting shallow 4+ mag tremors here almost weekly often 10km or less from the city and they hardly merit comment, it's only above mag 5 when folks here really start to take notice.

Two different sets of expectations. When you live in an area relatively free from quakes, you do indeed feel small ones more intensely and it allows those who feel it to identify with the folk hit by the big quakes even though they are in no way comparable. It is like the time that the US went ape about the possibility that a U-boat MIGHT be able to launch one V1 at NY in early 1945. They did not take kindly to being told by the UK Admiralty "not to worry, one V1 would not do much damage".

It is probably also a slightly strange vote of sympathy for what you guys are still experiencing!
 
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:06 pm

Quoting Baroque (Reply 10):
Two different sets of expectations. When you live in an area relatively free from quakes, you do indeed feel small ones more intensely and it allows those who feel it to identify with the folk hit by the big quakes even though they are in no way comparable.

Hmm except I aint a Kiwi, I'm from Scotland and only migrated here 5 years ago. Prior to Sept 4 I had never experienced even a slight tremor. So I had no previous level of expectation. Like I said in the near vicinity of the epicentre yes it would be quite noticeable, but a 4.4 mag 100 km away would be barely perceptible.

In fact to put it into perspective. Here in CHC we are still getting Mag 4+ aftershocks with great regularity, at distances of between 10 and 20km from the city. Most of these are of little concern now to most of us here, yet by comparison there is a real campaign top get lorry drivers to slow down in the city because when they speed past they are causing more vibration than many of the aftershocks. If you have a heavy lorry roar past your house at 60+ km/hr it feel just like a 4.0 mag tremor nearby.

[Edited 2011-07-05 09:15:48]
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baroque
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:11 pm

Quoting EDICHC (Reply 11):
Prior to Sept 4 I had never experienced even a slight tremor. So I had no previous level of expectation.

But now you are a bit more "practiced" than most I would imagine. Were you not there when the Great Glen fault formed?    At least as impressive as the Alpine fault - at the time!.
 
EDICHC
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:17 pm

Quoting Baroque (Reply 12):
Were you not there when the Great Glen fault formed?

I know I'm old but not THAT old!     
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Aaron747
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:24 pm

The ring of fire is just going nuts this year. Waiting for the other shoe to drop in this neck of the woods...
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EDICHC
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RE: 6.5 Earthquake Rocks North Island NZ

Tue Jul 05, 2011 4:44 pm

Quoting Aaron747 (Reply 14):

All too true I think. Did I not see something about a 7+ somewhere in the Aleutians?

And to think GeoNet here is saying there is a 30% chance now of CHC sustaining another 6+ in the next year.

[Edited 2011-07-05 09:46:20]
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RE: 6.5 Earthquake Rocks North Island NZ

Wed Jul 06, 2011 8:47 am

Quoting EDICHC (Reply 9):
But it is a better example of local perception of a quake

The subjectivity of it is something that I don't particuarly like though.. But there isn't much else in terms of a 'scale', as long as everyone knows what each level is.

Quoting EDICHC (Reply 15):
All too true I think. Did I not see something about a 7+ somewhere in the Aleutians?

Scary thought. Yes, there was one on the Alaskan island chain which had a semi tsunami warning which was later cancelled. Just imagining if the San Andreas fault was next up in that situation.
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RE: 6.5 Earthquake Rocks North Island NZ

Thu Jul 07, 2011 11:05 am

Quoting NZ107 (Reply 16):
Scary thought. Yes, there was one on the Alaskan island chain which had a semi tsunami warning which was later cancelled. Just imagining if the San Andreas fault was next up in that situation.

And now the 7.6 in the Kermadec Trench this morning....right on the edge of the Pacific plate.
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