The nine point zero magnitude earthquake was the fourth most powerful earthquake ever recorded worldwide. It was also the worst earthquake ever to hit Japan. The tsunami waves that followed were reported to have reached as high as thirteen meters in some areas.
Costas Synolakis says Japan’s concrete sea walls were not built to handle such high waves.
COSTAS SYNOLAKIS: "The concrete seawalls in many places in Japan are about 10 meters, that's about 33 feet. In Sendai, they were about three meters, that's about 10 feet. So that shows you that at least in that area they were not expecting such a sizeable wave because they would have built a higher seawall.”
A tsunami wave can travel as fast as eight hundred kilometers per hour. To get to higher ground people would often have to travel for many kilometers. This can take more time than a fast traveling tsunami will permit. This is especially true in cases like Japan, where the center of the earthquake struck so close to the coastline. The tsunami waves followed almost immediately.
Experts say early warning systems will continue to be limited by these facts until earthquakes and tsunamis can be predicted
And that's the VOA Special English Technology Report, written by June Simms. You can find more news about the disaster in Japan at our website, voaspecialenglish.com. You can also find transcripts, MP3s and podcasts of our reports. And you can find us on Facebook and YouTube at VOA Learning English. I'm Steve Ember.
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2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25
2013-11-25