A moderately strong earthquake has struck close to the West Coast town of Te Anau overnight.

The 4.2 magnitude quake hit shortly after 1.30am at a depth of 15 kilometres, GeoNet reports.

It was located 60km north-west of Te Anau.

Meanwhile, another earthquake shook Seddon this morning, reaching 3.2 on the richter scale.

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It struck 15km east of the upper South Island town, at a depth of 21km.