The 1991 eruption of Mount Pinatubo in the Philippines' Luzon Volcanic Arc was the second-largest volcanic eruption of the 20th century, behind only the 1912 eruption of Novarupta in Alaska. Eruptive activity began on April 2 as a series of phreatic explosions from a fissure that opened on the north side of Mount Pinatubo .

2025年3月21日 · Mount Pinatubo, volcano, western Luzon, Philippines, that erupted in 1991 (for the first time in 600 years) and caused widespread devastation. Mount Pinatubo is located about 55 miles (90 km) northwest of Manila and rose to a height of …

On July 16, 1990, a magnitude 7.8 earthquake (comparable in size to the great 1906 San Francisco, California, earthquake) struck about 60 miles (100 kilometers) northeast of Mount Pinatubo on the island of Luzon in the Philippines, shaking and squeezing the Earth's crust beneath the volcano.

1991年6月15日 · The world’s largest volcanic eruption to happen in the past 100 years was the June 15, 1991, eruption of Mount Pinatubo in the Philippines. Bursts of gas-charged magma exploded into umbrella ash clouds, hot flows of gas and ash descended the volcano’s flanks and lahars swept down valleys.

1991 Mt. Pinatubo eruption caused widespread impacts across societal, economic and environmental areas. Pyroclastic flows, lahars as well as the ashfall hazard all resulted in damage and casualties.

2025年3月7日 · During the giant eruption, huge pyroclastic flows—mixtures of hot ash and gases denser than air—swept down the flanks of Pinatubo as far as 16 km (10 miles) from its old summit. These intensely hot ash flows sterilized 400 square km (154 square miles) of land around the volcano, filling valleys with high-temperature deposits as much as 200 ...

1990年7月16日 · The June 29, 1991 eruption column from Mount Pinatubo with Marella River Valley. Aerial view to north of pyroclastic-flow deposits in Marella River valley (in foreground) and tributaries of Balin Buquero River (in distance) with ash plume rising from Pinatubo's caldera.

2021年6月15日 · Mt. Pinatubo started its eruption on June 7, 1991, spewed a 20-kilometer high ash column on June 12, and rumbled a climactic eruption on June 15, 1991. It was the second largest volcanic eruption of the 20th century.

Recognition of the volcanic unrest at Mount Pinatubo in the Philippines began when steam explosions occurred on April 2, 1991. The unrest culminated ten weeks later in the world's largest eruption in more than half a century.

On June 15, 1991, Mount Pinatubo disgorged 5 cubic kilometers of material over a few hours, and ash clouds soared 35 kilometers into the atmosphere. The substantial eruption — the second largest of the 20th century — burned itself into memories and history books.