Magnitude 5.7 Earthquake - Christchurch, New Zealand

  • Thread starter StevieTNZ
  • Start date
  • #26
1,474
388
And it seems there was another strong earthquake down in Christchurch early this morning:
http://www.stuff.co.nz/the-press/ne...e-quake-wakes-sleeping-christchurch-residents

Christchurch residents have described hearing a roar before an early morning quake on Monday "hit like a freight train", shaking them from their beds.

The 4.3 magnitude earthquake hit near Cashmere, just five kilometres south of the central city, at 3.32am.

It hit at a depth of just five kilometres. Geonet listed the quake as "strong".
Eeeckk, and I am down in Christchurch 11 - 13 March.
 
  • #27
Astronuc
Staff Emeritus
Science Advisor
18,824
2,038
M 4.3 - 14km (9 mi) ESE of Christchurch, New Zealand (moderate) USGS puts it under Godley Head Farm Park, near the location where the cliffs collapsed, but the Canterbury Quake site puts it 5 km under Christchurch north of Cashmere Rd. That's quite a difference.

Time: 2016-02-28 14:32:40 UTC
Location: Lat 43.584°S, Long 172.803°E
Depth: 10.0 km - Shallow

It would definitely feel strong if one was close to the epicenter.

29 Feb 2016 3:32am Depth 5.00 km Mag 4.30
http://www.canterburyquakelive.co.nz/Browse/?reference=quake.2016p158394
 
  • #29
davenn
Science Advisor
Gold Member
2019 Award
9,252
7,564
M 4.3 - 14km (9 mi) ESE of Christchurch, New Zealand (moderate) USGS puts it under Godley Head Farm Park, near the location where the cliffs collapsed, but the Canterbury Quake site puts it 5 km under Christchurch north of Cashmere Rd. That's quite a difference.
which is why I don't rely on the USGS when it comes to event locations well outside their high density networks
and that goes for any event outside the USA ... mainland USA, Hawaii and Alaska have great high density networks and have no problems accurately locating events within those regions
For the rest of the world, the need to rely on networks within the countries concerned is important

the USGS/NEIC have one station within NZ, in Wellington as part of its WWSSN the next closest ones are more than 1000km away

Dave
 
Last edited:
  • #30
davenn
Science Advisor
Gold Member
2019 Award
9,252
7,564
That one was quite a jolt, seeing as it was under the city and only 5kM down, the accelerations were quite high for a seemingly low magnitude. Woke me and the cat up, it was short though so I didn't make it out of bed.
yes, my daughter in Riccarton felt it quite well too ( within 10km of the epicentre)
 
  • #31
Astronuc
Staff Emeritus
Science Advisor
18,824
2,038
the USGS/NEIC have one station within NZ, in Wellington as part of its WWSN the next closest ones are more than 1000km away
It would seem they need an array in Canterbury. NZ seems to have a good network there.
 
  • Like
Likes davenn
  • #32
davenn
Science Advisor
Gold Member
2019 Award
9,252
7,564
It would seem they need an array in Canterbury. NZ seems to have a good network there.
you may already be aware of this ??
...
http://earthquake.usgs.gov/monitoring/gsn/

that gives the locations and operational status for the GSN, Global Seismic Network, formerly the WWSSN (World Wide Standard Seismic Network)

Once upon a time they were all running the Sprengnether long period horizontal seismometer
http://americanhistory.si.edu/collections/search/object/nmah_1445876

Sprengnether horizontal long period seismometer.jpg


I ran one from home for most of the 1990's, it was a spare from the Otago University Geology Dept
where I did my geol. studies

They were a solid beast weighing around 80 lbs .. triangular shaped base about 1.5 ft per side
around 40lbs of the weight was in that central vertical cylinder of brass. the whole thing had a cover
over it with a little window to observe the arm centring pointer that you can see in the centre of the brass mass ... a really nice instrument

here's a link to many of the seismograms of the stations around the world
They update roughly every 30 mins

http://earthquake.usgs.gov/monitoring/operations/heliplots_gsn.php [Broken]


Dave

PS ... you may well be coming to realise over recent years, that this subject is a real hobby horse of mine :smile:
 
Last edited by a moderator:

Related Threads on Magnitude 5.7 Earthquake - Christchurch, New Zealand

  • Last Post
Replies
4
Views
2K
Replies
2
Views
2K
  • Last Post
Replies
1
Views
427
  • Last Post
Replies
5
Views
652
  • Last Post
Replies
7
Views
2K
Replies
4
Views
2K
  • Last Post
Replies
4
Views
2K
  • Last Post
Replies
3
Views
457
Replies
16
Views
2K
  • Last Post
Replies
2
Views
3K
Top