According to the text, what natural phenomena frequently occurred in Japan, and what was the state's early administrative structure like?

Analysis:

• The text lists 'землетрясения' (earthquakes) and 'тайфуны' (typhoons) as frequent natural phenomena.
• Regarding administration, it mentions that the state was headed by an emperor ('Во главе государства стал император') and that for strengthening imperial authority, the government system was reorganized in the style of neighboring China ('перестроено по образцу соседнего Китая').

Answer:

Japan frequently experienced earthquakes and typhoons. The state was led by an emperor, and its governmental system was reformed to resemble that of neighboring China to consolidate imperial power.