1. Kermadec Islands
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2. Kermadec Islands
➲There are Kermadec Islands in the South Pacific Ocean
800–1,000 km northeast of New Zealand.
➲The Kermadec trench is in east of Kermadec Islands. It is
one of Earth's deepest oceanic trenches.
➲Only scientists and staff in meteorological live in the
islands now.

3. Magnitude
➲ Magnitude is character of earthquake which Charles Francis
Richter devised.
➲ It refers to a number of ways to assign a single number to
quantify the energy contained in an earthquake.
➲ log10 E = 4.8 + 1.5 M E: Energy of earthquakes
M: Magnitude

4. Pacific Ring of Fire(1)
➲ There is Kermadec Islands on Pacific Ring of Fire, so
earthquakes frequently occurs in the islands and
surrounding.
➲Pacific Ring of Fire is that Volcanic zone surrounding around
the Pacific.
➲Japan also is on Pacific Ring of Fire.
➲There is orogenic belt other than Pacific Ring of Fire.
It is Alpide belt, but volcanic activity don`t occur as Pacific
Ring of Fire.

5. Pacific Ring of Fire(2)
Brue line: sea trench

6. Oceanic trench
➲The oceanic trenches are hemispheric-scale long but narrow
opographic depressions of the sea floor.
➲Trenches are one of the most important natural boundaries
the Earth’s solid surface
➲Basically, oceanic trenches are on orogenic belt.
➲Accoding to Plate tectonics, oceanic treanch is subduction
zone.
➲Subduction Zone is place which plates slam into one another.

7. Earthquake in Kermadec Islands
and the surrounding
➲July 7, earthquake measuring 7.6 on the Richter scale
attacted the Kermadec Islands.
➲The U.S. Pacific Tsunami Warning Center issued tsunami
warning for the Kermadec Islands, New Zealand and the
Pacific islands.
➲Big tsunami did not occurs.
➲There was little damage by tsunami and earthquakes.

8. Summary
➲Kermadec Islands is on Kermadec trench and the surrounding
are.
➲Kermadec Islands are on Pacific Ring of Fire.
➲Pacific Ring of Fire is that Volcanic zone surrounding around
the Pacific.
➲Earthquakes frequently occur on Pacific Ring of Fire.
➲Japan also is on Pacific Ring of Fire