Our Treasures: The Seismometer Installed in Kiwi North

An earthquake in Fiji was recorded on May 24 on the Kiwi North seismometer. The attached photo

I can move things, but you can’t see me.

I can measure with a scale, but I weigh nothing.

I cause mistakes, but no one has done anything wrong.

Of course I’m talking about an earthquake.

New Zealand was once referred to as The Shaky Isles, which is no stranger to earthquakes and most of us have a story or two about the time the Earth moved us.

According to GeoNet, there are an average of 20,000 earthquakes per year in our country, but only about 250 are large enough to be felt.

That’s why I was so excited to see our newest treasure installed in Kiwi North – the seismometer, an instrument that measures Earth’s vibration.

Our seismometer is a TC-1 model, built from a simple design that introduces many concepts from physics and engineering. It consists of four main features.

A spring connected to a magnet that moves when the earth is vibrating, the moving magnet creates an induced current in a coil, then the Arduino Uno micro-controller receives this current and converts the analog signal into a digital signal, and finally, the digital signal is sent to the computer screen.

The seismometer here is one of more than 30 public units in schools and museums nationwide. This is an initiative by the Rapid Characterization of Earthquakes and Tsunami Corporation (R-CET) and is led by Geological and Nuclear Sciences (GNS).

Related Articles The Kiwi North Seismometer is a TC-1 model like the one pictured here. The attached photo

The network of seismometers is called Rū, which is named after Rūaumoko, the Maori god of earthquakes and volcanoes.

Four of these seismographs are operating in Northland, and more will be installed soon.

Dr. Sophia Tsang, a leadership practice subject at GNS Science, explained that Northland’s physical shape makes it ideal for capturing data from across the South Pacific. Our seismometer here at the museum recorded an earthquake on May 24 in Fiji that, although with a magnitude of 6.3 on the Richter scale, was centered 600 kilometers underground and did not create any surface waves.

An explanation of how the Rū setting works. The attached photo

Other notable events recorded include an earthquake in Alaska last year captured by a seismometer at Whangarei Girls’ High School, and several units across New Zealand recorded a sonic boom from a volcanic eruption in Tonga in January.

These general units are designed for educational purposes, to inspire and generate interest in seismology, and the Rū here in Kiwi North remains a source of great visiting interest for children and adults alike.

Mel Williams, Visitor Experience, Kiwi North

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