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New Zealand earthquake: Tsunami follows powerful tremor

bbc.co.uk

111–120 of 163 posts

Re: New Zealand earthquake: Tsunami follows powerful tremor

#111
post #107

Could there be any connection to the moon's current proximity to Earth? Does anyone know to what extent the moon's gravity can influence earthquakes? Tides are one thing, but it seems plausible that the moon being closer to earth than it has been in 68 years could be moving the plates a bit more than usual.

If fracking causes earthquakes (perhaps thats a big if) then a satellite that shifts billions of metric tonnes of water around the planet on a daily basis must surely have an impact.

Re: New Zealand earthquake: Tsunami follows powerful tremor

#112

Earlier quoted context omitted.

Given what ChCh went through, I really hope Wellington takes quake-proofing its more risk-prone buildings seriously. I say that every time an earthquake causes damage there, but still the building owners ask for more time and the council gives it.

Yeah Wellington has always taken it seriously, I remember the building where I worked in 2002 had a sticker on it by the council saying the building wasn't earthquake safe. The buildings here are much more earthquake safe than Christchurch but also the damage potential is much higher.

> Yeah Wellington has always taken it seriously,

Only sort of. We have the whole dynamic of pushing out the date buildings are supposed to be meeting requirements, and dodgy engineers signing off on buildings that are below target NBS.

Re: New Zealand earthquake: Tsunami follows powerful tremor

#114
post #110

Earlier quoted context omitted.

Yeah Wellington has always taken it seriously, I remember the building where I worked in 2002 had a sticker on it by the council saying the building wasn't earthquake safe. The buildings here are much more earthquake safe than Christchurch but also the damage potential is much higher.

Great. Do you have a pic of the sticker? I'm moving to Umbria, Italy...

No, it was a while ago. But a google image search showed up one of the ones that they used in Christchurch.

http://3.bp.blogspot.com/-Ncu7cINaZiE/TtGHnDoH72I/AAAAAAAAAS...

Re: New Zealand earthquake: Tsunami follows powerful tremor

#115

Earlier quoted context omitted.

Yeah Wellington has always taken it seriously, I remember the building where I worked in 2002 had a sticker on it by the council saying the building wasn't earthquake safe. The buildings here are much more earthquake safe than Christchurch but also the damage potential is much higher.

> Yeah Wellington has always taken it seriously, Only sort of. We have the whole dynamic of pushing out the date buildings are supposed to be meeting requirements, and dodgy engineers signing off on buildings that are below target NBS.

Dodgy engineers aren't going to sign off on anything because they are liable for manslaughter in the case of a catastrophe. I used to work for a structural engineering company and had to present evidence at the Royal Commission of Inquiry, engineers (at least all the ones I know) take this very seriously.

Most of the out of date buildings are empty, there are still a few empty buildings around Wellington because they don't meet code.

Re: New Zealand earthquake: Tsunami follows powerful tremor

#116
post #110

Earlier quoted context omitted.

Great. Do you have a pic of the sticker? I'm moving to Umbria, Italy...

No, it was a while ago. But a google image search showed up one of the ones that they used in Christchurch. http://3.bp.blogspot.com/-Ncu7cINaZiE/TtGHnDoH72I/AAAAAAAAAS...

Thanks.

Re: New Zealand earthquake: Tsunami follows powerful tremor

#117

Damn that is really scary. I used to work in Miramar (Wellington suburbs), which is built on reclaimed sea, if I recall, and everyone was freaked out that a major earthquake would liquify the entire area.

Huh? Miramar is a steep hilly peninsular. Are you talking about Rongotai?

The flat bit in the middle that is most of the Miramar suburb is seabed (and later swamp) that has been uplifted by large earthquakes over time.

Re: New Zealand earthquake: Tsunami follows powerful tremor

#118
post #107

Could there be any connection to the moon's current proximity to Earth? Does anyone know to what extent the moon's gravity can influence earthquakes? Tides are one thing, but it seems plausible that the moon being closer to earth than it has been in 68 years could be moving the plates a bit more than usual.

In general, there is a connection. The earth tides have an amplitude in the tens of centimeters [1] (yes, the earth moves under our feet!) and a connection to earthquakes is a given, since the stress changes on faults can trigger them. Here is one example: [2] Their research also indicates that a higher stress can trigger earthquakes not triggered by lower stress since the local fault strength must be exceeded.

[1] https://en.wikipedia.org/wiki/Earth_tide

[2] http://www.pnas.org/content/113/31/8601.abstract

Re: New Zealand earthquake: Tsunami follows powerful tremor

#119

Description on Twitter: "The shaking went on for ages, longest quake I've felt. It was like waiting for a Verge article to finish loading." https://twitter.com/thefoehesought/status/797814348672421888

For context there was about 2mins of shaking :)

The longest quake I've ever felt too. Some seismologists are speculating that it might actually have been two distinct quakes happening at roughly the same time.

Re: New Zealand earthquake: Tsunami follows powerful tremor

#120
post #94

Earlier quoted context omitted.

If you are getting bottled water after an earthquake, you are already f*cked. Have water on hand beforehand! It's not like bottles of water aren't for sale everywhere.

Yes, absolutely agreed. Last night's quake exposed my flat's somewhat chronic lack of preparation. I'll be visiting the supermarket tonight and ensuring our insurance policies are up to date, as I imagine much of Chch will be. We've got a small collection of life straws/survival supplies for tramping, which is good, but they're in a part of the house that'd be inaccessible in a major event :/.

Stay safe and good luck.
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