Where is the largest volcanic lake in the world?

In the northern part of Sumatra Island, Indonesia, there is the largest lake in the country-Doba Lake. This lake is rhombic, nearly 1 kilometers long, 3 kilometers wide and more than 5 meters deep, with an area of 1,13 square kilometers, which is equivalent to the size of nearly 18 West Lakes in Hangzhou, but it is not large compared with the great lakes in the world, and it is a famous tourist attraction in Indonesia. Some dynasties in Indonesian history once built palaces here, but only 1 years ago, no one knew that this lake was actually a huge crater.

Because 74, years ago, a super volcano erupted here, which eventually formed today's Doba Lake, which is also the largest volcanic lake in the world.

According to the research of geologists, there is an active volcano under this great lake, which has experienced four eruptions in history. The first eruption occurred about 1.2 million years ago, and this time in volcanic explosivity index, a large number of Harigian tuff was ejected in July or August, with a total volume of several hundred cubic kilometers. The second eruption took place about 84, years ago, and the level was similar to that of the first eruption. The third eruption took place about 51, years ago, and the energy was still very huge, with 5 cubic kilometers of ejecta.

but the most violent is his fourth eruption, which happened 74, years ago. The volume of its ejecta reached 2,5-3, cubic kilometers. Geologists think it is the largest volcanic eruption in 19 million years, and the explosive power is about 11 billion tons of TNT equivalent. Three days after the eruption, volcanic ash covers half the earth, and seven days later, volcanic ash covers the whole earth. The erupting magma and volcanic ash turned this area into a plateau. The volcanic ash in Malaysia, 4 kilometers away from the volcano, is 9 meters thick, and the volcanic ash in Deccan Plateau, India, 3, kilometers away is 15 centimeters thick. The volcanic ash blocks the sun's rays and makes the sky gloomy, making plants in most parts of the earth unable to carry out photosynthesis. The average temperature dropped by at least 5 degrees Celsius for 6 years, and even dropped by 15 degrees Celsius in the northern hemisphere. Many species on the earth were extinct, and humans almost disappeared in this volcanic eruption. Only a few people with less than 1% stubbornly survived. It is said that there are only a few thousand people, and it is they who have continued the fate of mankind.

Although there is such a huge energy release, this volcano has not died. In 213, Indonesian geologists pointed out that there is still a huge magma chamber under the Doba crater, which has been sleeping for tens of thousands of years under the beautiful Doba Lake. Once an earthquake occurs, it may erupt at any time. Once it breaks out, not only the beautiful scenery here will disappear in an instant, but also the sky in Indonesia will become dark, which will affect the climate and ecological environment of the earth.