Tsunami is measured in several tens, hundreds, or possibly thousands of meters of the movement from its place or position of water with an initial wave amplitude (height).
About 80 km off the east coast of New Zealand lies the Hikurangi Trench, a subduction zone that plunges 3,000 meters beneath the surface and forms the margin between the vast Pacific Plate and its smaller western neighbor, the Australian Plate. The earthquake potential for this region is well known, but new research indicates the massive quakes that have occurred in the past may occur with greater frequency than once believed, which is bad news for New Zealand. According to the latest findings, they are long overdue.
The 2004 Indian Ocean Tsunami was able to take so many lives due to the lack of warning system in the Indian Ocean. Those in the affected areas had little-to-no warning and no time to evacuate. Since then, it has been an international effort to develop and put into practice a reliable warning system.