Another Friday morning at work; so far, so normal. Then the
building starts to shake. OK, we think, that’s happened before. But it doesn’t
stop, and when the shaking suddenly gets worse, I followed emergency procedures
and dived under my desk, and held onto the desk leg until the shaking stopped.
Well, that gave us something to talk about for the rest of
the day. There were some aftershocks, but nothing you could really feel, until mid-afternoon,
when another
shock of 4.6 magnitude rumbled through. Back under the desk again.
Throughout the weekend there were further aftershocks – you could
feel the vibrations if you sat down or lay down perfectly still – but nothing
really to worry about. That is, until late Sunday afternoon, when a
really big one came through. Originally measured at 6.9, it was later confirmed as a
6.5 magnitude quake (by way of comparison, the two quakes which shook
Christchurch in February and June 2011
were 6.3 and 6.4 magnitude).
There has been
some damage to buildings in the centre of
Wellington, including some broken windows, cracked concrete and roads, and
damage caused by sprinkler systems going off, as well as the usual stuff
falling off supermarket shelves and making a mess, which looks impressive in
the news but isn’t really damage.
|
Damage in the BNZ building on Harbour Quays |
On Monday morning, parts of the CBD were closed to the
public, and Civil Defence were advising people not to come into work. Our
Business Continuity Plan had already been brought into effect on Sunday night,
with messages cascading down about what to do and whether to go to work. Monday
was a “quake day” for us, so we decided to go and watch
The World’s End at
The Roxy, which seemed appropriate.
By Monday evening, most buildings had been given the all
clear by structural engineers, and Nicola went into work as normal on Tuesday.
The building I work in, unfortunately, is one of those that has not yet been
opened – it’s apparently suffered some damage due to a ruptured water tank, so
I’m still waiting to find out when I’m supposed to go back to work.
This series of earthquakes – a “swarm” in the jargon – is centred
in the
Cook Strait. It is not on the
Wellington Fault, which is the biggest concern for Wellingtonians. (The whole
city is built on a fault – way to go, early settlers!) Whether this series has
increased or decreased the likelihood of a quake on the Wellington Fault is
still a
matter for the seismologists to figure out. However, the fact that the
fault is known about is probably a contributing factor in the resilience of the
buildings to the quake, as all modern buildings have been built to a more
rigorous earthquake-proofing code, and older buildings have been strengthened.
We’re still getting aftershocks in the magnitude 4 range,
which is just about at the limit of being felt. The likelihood of another large
shock is decreasing, so they say, but it hasn’t gone away entirely.