Another Spectrum

Personal ramblings and rants of a somewhat twisted mind


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Earthquakes!

First a minute long 7.2 shake just at 2:27 AM this morning. I didn’t bother getting out of bed as it was more of a rolling motion than sharp jolts. New Zealand homes are designed to remain mostly intact during earthquakes. They may may not be habitable afterwards, but their structure does minimise serious injury and death. This particular quake knocked a few items of shelves but nothing was broken.

A few hours later another 7.4 earthquake struck around 900 Km offshore, and in the last hour an 8.1 earthquake struck just of the east coast of the North Island. The third tsunami warning of the day has been issued and evacuation orders have been made for some areas.

And of course so many are evacuating by vehicle causing massive traffic jams, whereas official advice it to walk, run or cycle where possible to avoid congestion. Why are so many people such idiots?

There have also been a number of less intense earthquakes of 5.0 or greater during this morning. Of course the big question in these earthquake swarms is has the biggest shake occurred? Typically the first shake is the largest, but today the strongest was shake was some seven hours after the first. This may even be the first stage of a long lasing swarm. We experienced such a swarm many years ago when we lived in Whanganui. The swarm lasted for around a month and with dozens of shakes, some of which made walking virtually impossible and it was necessary to crawl to cover.

I’ve experienced so many earthquakes during my seventy plus years that I’m rather blasé about them. Having said that, I rather enjoy the ride provided by long or severe shakes – a kind of adrenalin rush. We’ve experienced relatively little damage over the years. Only crockery and ornaments falling of shelves and cracks appearing in our home and in paths around it.

Living in a volcanic, seismically active region, most of us accept the risks of living here. There are a number of regular re-occurring earthquakes that have been documented. Perhaps the most threatening is the Alpine fault that stretches along almost the entire length of the South Island and fractures every 300 to 350 years. The last fracture occurred a little over 350 years ago so it’s not so much a matter of “if” but “when”. Quite likely within my lifetime.

For the moment we have the task of letting friends and family living overseas that we are safe and sound.