Peter hadfield in Tokyo (see Graphic) Local water scientists say the tsunami that struck a small island off the coast of Japan last week-killing or missing 240 people-intensified by the island\'s cessation of photography. This happens when the Cape reaches out to the sea and draws in the waves in the same way as the lens focuses on the light. The huge waves were caused by a strong earthquake. On the evening of July 12, a tropical island was attacked off the coast of the northern island of Hokkaido. Okushiri Island is located near Hokkaido, less than 100 kilometers from the epicenter. A few minutes after the earthquake, Okushiri was struck by a 10-meter tsunami. According to Abe Xiufu of the Earthquake Research Institute at the University of Tokyo, the captain is particularly vulnerable to the tsunami. When one of the big waves moves to the shore, the nearest part of the Cape will encounter shallow water first. This makes it slow relative to the part next to it, so the waves start bending inward to the Cape. So Okushiritown was hit by each tsunami in three directions. The earthquake is only about 34 kilometers from the bottom of the sea. the shallow extent of the earthquake is as important as the severity of the tsunami. These waves are often generated less than 100 kilometers from the epicenter of the earthquake. January, similar A large earthquake hit the east coast of Hokkaido. But more than 100 kilometers underground, no tsunami. Last week, Japanese seismologists tried to find out why they missed signs of an earthquake in the Okushiri area. A major structural boundary between the North American and Eurasian crust plates moves from southwest to northeast near the island, and on 1940 and 1983, earthquakes occurred on the fault lines on both sides of the island. Seismologists now acknowledge that the closest fault to ofukushili is part of a \"blank zone\" that they did not expect to crack \". Japan spends millions of millions on earthquake prediction and monitoring every year, but most of its work is concentrated in the more fragile Suruga Bay area west of Tokyo. Japan\'s \"big earthquake\" is expected to have a magnitude 8 earthquake. The region is expected to reach level 1 on the Richter scale. The region is expected to reach ter size soon.