File:Pre-eruption Pinatubo.jpg

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Pre-eruption_Pinatubo.jpg ‎(500 × 334 pixels, file size: 69 KB, MIME type: image/jpeg)

Description

Mount Pinatubo in April 1991, before the onset of magmatic eruptions.

Preeruption Mount Pinatubo, April 16, 1991. View from the northwest, up the Maraunot River valley. The river had become acidic and silty, owing to reactivation of the hydrothermal system and phreatic explosions of April 2, 1991 (the vents of which were just out of view at left edge of photograph). Steam was from 2-week-old fumaroles on the upper north slope of the volcano. The fumarole farthest to the right (behind a jagged ridge, right of the one visible on the valley floor) would later become the site of the preclimactic lava dome extrusion of June 7-12 (Hoblitt, Wolfe, and others, this volume). Mount Negron is behind and to the right of Pinatubo. (R.S. Punongbayan)

Date
Source Figure 2A on Photographic Record of Rapid Geomorphic Change at Mount Pinatubo, 1991-94
Author United States Geological Survey
Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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16 April 1991

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Date/TimeThumbnailDimensionsUserComment
current18:57, 12 October 2005Thumbnail for version as of 18:57, 12 October 2005500 × 334 (69 KB)AscánderMount Pinatubo in April 1991, before the onset of magmatic eruptions. (Probable) source: [http://pubs.usgs.gov/pinatubo/punong1/fig2a.jpg Fig.2A] on [http://pubs.usgs.gov/pinatubo/punong1/index.html] {{PD-USGov-Interior-USGS}} [[Category:Philippines]
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