Jump to content

File:Computer animation showing May 18, 1980 St Helens landslide.png

Page contents not supported in other languages.
This is a file from the Wikimedia Commons
From Wikipedia, the free encyclopedia

Original file (788 × 812 pixels, file size: 217 KB, MIME type: image/png)

Summary

These illustrations show the landslide (green) and directed blast (red) that occurred during the first few minutes of the eruption of Mount St. Helens in 1980.

Before the eruption, an estimated 0.11 km³ of dacite magma had intruded into the volcano (equivalent to sphere about 600 m in diameter!). The rising magma forced the volcano's north flank (right side of illustration) outward about 150 m and heated the volcano's ground water system, causing many steam-driven explosions (phreatic eruptions).

Following a magnitude five earthquake on the morning of May 18, 1980, a landslide (green) unroofed the hot magma and surrounding hydrothermal system, and the resulting rapid depressurization caused a series of steam and volcanic gas driven explosions. The explosions burst through part of the landslide, blasting rock debris northward. The resulting pyroclastic surge quickly overran the landslide and spread over ridges and valleys across an area of 550 km².

USGS image (by T.R. Alpha) and text from [1]

Summary

Description Computer animation showing May 18 1980 Mount St. Helens landslide
Date
Source USGS image (by T.R. Alpha)
Author U.S. government
Permission
(Reusing this file)
PD

Licensing

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.

Bahasa Indonesia  català  čeština  Deutsch  eesti  English  español  français  galego  italiano  Nederlands  português  polski  sicilianu  suomi  Tiếng Việt  Türkçe  български  македонски  русский  മലയാളം  한국어  日本語  中文  中文(简体)  中文(繁體)  العربية  فارسی  +/−

Captions

Add a one-line explanation of what this file represents

Items portrayed in this file

depicts

May 1980

image/png

e82cf8618f7c9e482f6b2adb0bef144fdb9081e6

221,746 byte

812 pixel

788 pixel

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current20:36, 13 March 2006Thumbnail for version as of 20:36, 13 March 2006788 × 812 (217 KB)Reelax== Description == These illustrations show the landslide (green) and directed blast (red) that occurred during the first few minutes of the eruption of Mount St. Helens in 1980. Before the eruption, an estimated 0.11 km³ of dacite magma had intruded int

The following 2 pages use this file:

Global file usage

The following other wikis use this file: