I don't remember if I felt earthquakes in childhood.

Although the Japanese government already announced last year that Tokyo has a 70 % chance of that powerful earthquake in the next 30 years, it seems that the phrase "in the next four years" is shocking to people.

However, this announcement warns that wide areas near Tokyo are due for a powerful earthquake, so we are strongly advised to pay more attention to preparing ourselves for it.

A 70% chance that a powerful earthquake will occur in the next four years.

It has been predicted for perhaps about 40 years that the Shizuoka prefecture (静岡県) has the highest chance of a powerful earthquake happening.

Because of this, the area has been undergone the greatest attention in Japan. to preparations for earthquakes. ( You've established in the former sentence that an earthquake could happen, so it makes more sense to remove that last bit.)

The residents have been making great efforts to make their houses more earthquake resistant.

Some of my friends were raised in Osaka, but had moved to Tokyo. They told me the frequency of earthquakes in Tokyo was much higher than in Osaka.

They were also surprised to see that Tokyo's citizens were used to earthquakes.

I've recently been living in the Tokyo area, but I was raised mainly in Osaka.

I don't remember having felt earthquakes in childhood.

I'm sure I've experienced them, but I don't think they were strong enough to notice them.

In contrast, my friend who was raised in the Tokyo area says that, even when he was a child, he already considered that earthquakes are meant to happen.

Contrary to the aforementioned prediction, a powerful earthquake hasn't hit Shizuoka since the prediction was first announced many years ago (I'm not sure exactly when the first announcement was made,

maybe 40 or 50 years ago).

Under these circumstances, I have always been assuming that massive earthquakes could happen anywhere in Japan, and one is sure to hit my area sooner or later. (You seem to keep getting 'been' mixed up.)

To be honest, I was a little shocked when I first read the news, but then after a few minutes, I realized there was nothing unfamiliar in the news.

However, the announcement had warned many areas near Tokyo that a powerful earthquake is shortly due, so we are required to pay far more attention in preparation for it.

However, different preparations for earthquakes are carried out in different areas of the countries.

It has been predicted for perhaps about 40 years that Shizuoka prefecture/静岡県 has the highest chance of being struck by a powerful earthquake.

Because of this, the area has been paying the greatest attention to earthquake preparation.

I've heard that many schools there require their students to wear helmets on the way to and from school. (No correction, but wow!!)

They said that they were surprised to see that people in Tokyo people were used to earthquakes.

I've been recently living in the Tokyo area recently, but I was raised mainly in Osaka.

I don't remember feeling any earthquakes during my childhood.

I'm sure I experienced them, but I don't think they were strong enough for me to notice. (If you didn't notice them at all, this is how you can say it. If you think you noticed them at the time and just don't remember, you could say, "strong enough for me to remember.")

In contrast, my friend who was raised in the Tokyo area says that even when he was a child, he already considered earthquakes to be an inevitable part of life.

Contrary to the aforementioned prediction, which was made many years ago, a powerful earthquake has yet to hit Shizuoka since the prediction was first announced many years ago (I'm not sure exactly when the first announcement was made.

Instead, at least ten massive earthquakes, including the 3/11 one, have struck other areas in the past three decades.

If I include high magnitude earthquakes which didn't cause significant damage, the number will soar.

The Great Hanshin Earthquake in Kobe, next to Osaka, in 1997, which killed about 6500 people, caught people off guard since the frequency of earthquakes in that area had been low and no powerful earthquake had been expected there.

Under these circumstances, I have been always assumed that a massive earthquakes could happen anywhere in Japan and one is sure to hit my area sooner or later.

A few days ago, the earthquake research institute at Tokyo University announced that the chance of a powerful earthquake with a magnitude of 7 or more striking the southern part of metropolitan Tokyo in the next four years is as high as 70%.

Although the Japanese government already announced last year that Tokyo has a 70 % chance of being hit by a powerful earthquake in the next 30 years, it seems that the phrase, "in the next four years," is shocking to people.

To be honest, I was a little shocked when I first read the news, but a few minutes later, I realized that it was nothing new in the news. (It sounds awkward to me to repeat "the news" twice in the same sentence.)

However, this announcement warns that the Tokyo area is due for a powerful earthquake, so we are strongly urged to pay more attention to preparing ourselves for it.

The residents have been making great efforts to make their houses more earthquake resistant.