New Zealand has had dozens of 'slow' earthquakes that can last weeks. A hidden underwater sea may be the cause.

New Zealand has had dozens of 'slow' earthquakes that can last weeks. A hidden underwater sea may be the cause.

Napier sits along Hawke Bay on New Zealand's eastern coast, near the Hikurangi Plateau.Walter Bibikow via Getty Images <ul> <li>Slow-slip events or silent earthquakes take place over weeks or months… [+4270 chars]

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