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pubs.usgs.gov/fs/1997/fs113-97

The second-largest volcanic eruption of this century, and by far the largest eruption to affect a densely populated area, occurred at Mount Pinatubo in the Philippines on June 15, 1991. The eruption produced high-speed avalanches of hot ash and gas, giant mudflows, and a cloud of volcanic ash hundreds of miles across.

en.wikipedia.org/wiki/Mount_Pinatubo

The second-largest volcanic eruption of the 20th century, and by far the largest eruption to affect a densely populated area, occurred at Mount Pinatubo on Saturday, June 15, 1991. The eruption produced high-speed avalanches of hot ash and gas, massive lahar floods and huge clouds of superheated volcanic material hundreds of kilometers across.

www.volcanodiscovery.com/pinatubo/chronology-1991-eruption.html

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.

www.thoughtco.com/mount-pinatubo-eruption-1434951

The events of the 1991 Mount Pinatubo eruption began in July 1990, when a magnitude 7.8 earthquake occurred 100 kilometers (62 miles) northeast of the Pinatubo region, determined to be a result of the reawakening of Mount Pinatubo. Before the Eruption .

www.britannica.com/science/volcano/Mount-Pinatubo-Philippines-1991

Volcano - Mount Pinatubo, Philippines, 1991: Earthquakes and steam explosions announced the reawakening of Mount Pinatubo in 1991, surprising many geologists because Pinatubo was not even listed in catalogs of world volcanoes. This mountain (at that time having an elevation of 1,745 metres, or 5,725 feet) lacked the classic conical shape of a volcano because erosion had carved its summit into ...

www.usgs.gov/news/remembering-mount-pinatubo-25-years-ago-mitigating-crisis

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. The ...

www.britannica.com/place/Mount-Pinatubo

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 about 4,800 feet (1,460 m) prior to its eruption. After two months of emissions and small explosions, a series of major explosions began on June 12.

earthobservatory.nasa.gov/images/1510

For more details, read Astronauts Photograph Mount Pinatubo, on the Earth Observatory. Related information resources can be found at 10th Anniversary of the Eruption Felt Around the World. Also, be sure to check out The Volcano and the Climate Model—a case study produced by the American Museum of Natural History.

www.livescience.com/14603-pinatubo-eruption-20-anniversary.html

Here, steam rises from fumaroles on the caldera floor of Pinatubo, after the June 15 eruption and caldera collapse, as viewed from the north on Oct. 4, 1991. The outer flanks of the caldera are ...