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Baengnokdam is formed by the collapse of the top of the ridge by the movement of magma underground. ^[1]

The compositional rocks of the eastern and western walls of Baekrokdam are different.

The eastern wall is covered with basalt lava 2 ~ 5 m thick at its top.

In the lower part, there is a high-concentration stream sediment layer of the Tamra layer.

The western wall is made of trachyte lava dome.

The volcanic wall formed by the eruption of the lava should be composed of lava, analysis.

However, the eastern wall is composed of the clastic sedimentary sediments, so it is not a crater by lava eruption but a pitcrater.

Namely, the trachyte magma, which formed the Baekrokdam rachyte, was elevated on the dome, and the trachyte magma formed lava dome at its top.

The inclination and direction of the Tamra Formation of Baekrookdam can not be measured directly at Baekrokdam, but it is N10W of slope and 30NE of slope measured near the valley below North Baekrokdam, 1,580 m above sea level.

In order to understand the tendency of temperature change in Jeju Island, the short - term forecasting model of Halla, the weather data of the Korean peninsula, and the wind vector of AWS is analyzed. When the south winds flow into the sea, sea winds form around Hallasan, and sea breeze is formed on the downwind side of the sea. On the coast, winds and sea breezes gather around the coasts to form Eddy, and the highest temperature occurs in the region where Eddy occurs.

In order to understand the tendency of maximum temperature in Jeju Island, the area where the highest temperature occurred when the wind was weak was surveyed and analyzed. In the morning, when the reverse layer is formed and the wind is weak, the warm air of the lower layer is raised when the air movement between the upper and lower layers is blocked, and it is placed on the upper floor by the sea breeze, which affects the temperature rise in the mid-mountainous area.

The occurrence of the highest temperature coincides with the formation position of Eddy, and when the wind is weak, it is formed in the middle mountain region. When the wind is weak, the warmth is accumulated in the middle layer, so the maximum temperature in the mid-mountainous area is higher than the maximum temperature of the low-altitude coastal area about 1~3℃, and 4℃ or higher on the downwind side.

When the wind is blowing at 4 ~ 9 m/s, the wind phenomenon occurs mainly, so the weak sea breeze coming from the sea is formed on the coastal area and the peak temperature is mainly observed during the daytime.

The change of the minimum temperature varies depending on the degree of cooling of Hallasan and the intensity of the wind speed.When the wind blows due to the predominance of sea breeze, the air cooled in Hallasan descends to the coastal area and induces the decrease in temperature. When the synoptic wind blows strongly, the cold air of Hallasan moves to the downwind side and the lowest temperature is appeared. The lowest temperature in the downwind area is 2 ~ 5℃ lower than in other areas, and the lowest temperature often appears at night.

When the weak northwester synoptic winds are blown, the lowest temperature appears in the eastern part of Jeju Island. The chill of the top of Hallasan descends downhill along the mountain range, and is collected in the eastern part of Jeju Island so the morning temperature drops a lot.

For the last five years, the deviation of temperature (maximum temperature - minimum temperature) increased in spring between March and May. The reason for the large deviation in spring is because the phenomenon occurs frequently by Hallasan.