Earthquakes happen when two tectonic plates push together. Some big earthquakes can cause tsunamis and volcanoes. When the earth shakes beneath your feet, that's an earthquake.
Earthquakes can cause other dangerous thibgs like cracks in roads and any other place. Earthquakes start at the hypocentre, then build up tp the epicentre. Most earhtquakes happen in the 'Ring of Fire'.
The first machine to measure earthquakes was made by a Chinese scientist. His name was Chang Heng. Sometimes there is a fore shock which is before the main shock, then there's the after shock.
There ar 19 btectonic plates around the world. More than 300 000 earthquakes are felt a year. The worst earthquake happens when two plates scape together and get stuck. The biggest tectonic plate is the Antarctic Plate, then the Northern American Plate, then the Pacific Plate.
There are two different tupes of waves i nearthquakes - a primary wave and a secondary wave, but they can also be called push and sear waves.
More than 100 to 150 earthquakes can be felt each year in New Zealand. and thousands around the world. The worst earthquake is New Zealand was the 1931 Napier earthquake. This earthquakes was 7.8 on the Richter scale. It caused heaps of damage through the city and out on farms, with cracks. Another bad earthquake, The Wellington earthquake which was 8.2. The worst earthquake in the world was the Chile earthquake which was 9.5 and the Alaskan earthquake which was 9.2, but only 131 were killed.
Just remember that if there is an earthquake - drop, cover and hold.
Gregor Findlay ( aged 8 years)
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