鬼界カルデラの破局噴火からの被害を免れることができた東北地方の縄文日本人は何千年もの間日本で平和に繁栄し続けていました。
Those Jomon Japanese people who had lived in the northeastern part of Japan could avoid the damage from Kikai Caldera’s Ultra-Plinian eruptions, so they lived peacefully and prospered in Japan for another thousands of years.
もっとも、紀元前2,300年には26万人ほどいた縄文日本人も、地球寒冷化により紀元前1,100年頃には8万人ほどにまで激減していました。
However, due to the global cooling, the population of Jomon Japanese people which was about 260,000 in the 2,300 B.C. radically decreased to about 80,000 in the 1,100 B.C.
かような人口減少も、紀元前10世紀頃に周王朝に敗れた殷王朝の人々が日本に渡ってきたことでな高度に組織化された稲作農業を主とした生活様式が日本に入り、増加に転じていきました。
The population had increased since around the 10th Century B.C. because Yin Dynasty’s people who were defeated by Zhou Dynasty came into Japan, and they brought in the lifestyle with highly organized rice-farming system.
このぐらいの時期から弥生土器（「弥生」町で初めて発掘された類の土器）が使われ始めたことから、この時代は「弥生時代」と呼ばれています。
Since they began making and using Yayoi earth ware (the earth ware first found in a town called, “Yayoi”) around this time period, the historians call the times of this, “Yayoi Period”.
秦王朝に敗れた周王朝の人々が紀元前3世紀頃により新しく進んだ技術とともに日本へ渡って来てから日本の農業や土木建築業は一層合理化されました。
The efficiency and effectiveness of the agricultural and civil engineering work in Japan had improved a lot since around the 3rd Century B.C. when the people of Zhou Dynasty’s who were defeated by Chin Dynasty came into Japan with newer and more advanced technology.
