Earthquakes or tremors precede eruptions. volcano1

Seismic activity (earthquakes and tremors) always occurs as volcanoes awaken and prepare to erupt and are a very important link to eruptions. Some volcanoes normally have continuing low-level seismic activity, but an increase may signal a greater likelihood of an eruption. The types of earthquakes that occur and where they start and end are also key signs.
 Wikipedia, Prediction of volcanic activity, 2018

Earthquakes and tremors always precede volcanic eruptions. However 1400 years ago this was portrayed in the Quran.

[Quran 99.1-2] If the earth is shaken with its quake. If the earth brings out its loads.

Earth brings out its loads by volcanic eruptions. In the Quran earthquakes precede volcanic eruptions.


Natural depression or hole in the ground.

Sinkholes vary in size from 1 to 600 m (3.3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide.
Wikipedia, Sinkhole, 2018


In the northern part of Guatemala City, the downpour created a sinkhole the size of a street intersection. Residents told CNN that a three-story building and a house fell into the hole.
CNN, More than 175 dead from weekend storm in Central America, 2018

Sinkholes can suddenly swallow buildings. But 1400 years ago this was portrayed in the Quran:

[Quran 28.81] So We collapsed the earth beneath him and his house. He had no company to save him from Allah, and he could not defend himself.

The earth suddenly collapsed beneath him and his house. Today we know this is called a sinkhole.