What calligraphy technique is used in the famous Shanhaiguan plaque in China?

This giant tablet of "The First Pass in the World" is 5.8 meters long and 1.55 meters wide, and it is engraved with five characters of "The First Pass in the World" in Yangwen. Among them, the word "one" is 1.9 meters long, and the word "off" is 1.45 meters long vertically. The word "one" is not thin, and the word "off" is not bloated.

on the tablet, there are five characters "the first pass in the world", each of which is exquisite in structure, proper in layout, vigorous in brushwork, commensurate with the situation, and full of the style of town clearance, adding majesty and brilliance to the pass and showing its strategic position.