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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

Mount Pinatubo's summit before the 1991 eruption was 1,745 m (5,725 ft) above sea level, only about 600 m (2,000 ft) above nearby plains, and only about 200 m (660 ft) higher than surrounding peaks, which largely obscured it from view.

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.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.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 ...

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www.britannica.com/place/Mount-Pinatubo

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

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 ...