Volcano questions?

Question

Please anwsers the questions for these following volcano's, 1.Mt. Saint Helens

2. Diamond Head

3. Crater 160

How many times have each of them erupted?

The hight of the volcanos.

Distance to the nearest population center.

Approximate number of people living near the volcano.

Type of potential hazzards.

Human hazzard ranking (high, medium, low).

Answer 1

That represents a great deal of work for someone.

However you can find the information that you looking for here :  http://www.usgs.gov/hazards/volcanoes/

Answer 2

Mount St. Helens

Location: Washington

Latitude: 46.20 N

Longitude: 122.18 W

Height: 2,549 Meters (8,364 feet (9,677 feet before May 18, 1980))

Type: Stratovolcano

Number of eruptions in past 200 years: 2-3 2

Latest Eruptions: Between 1600 and 1700; about 1800-1802; 1831; 1835; 1842-44(?); about 1847-1854; 1857; 1980-? 3.

Present thermal activity: Strong steaming

Remarks: Continuous intermittent volcanic activity since 1980 2 ... Occasional eruptions of steam and ash; occasional pyroclastic flows; intermittent extrusion of dome-forming 3.

Hazard level:  dropped from orange to yellow 2/21/08

nearest pop. center:  Toutle, WA

                                  

Diamond Head:

Hawai'i's most famous landmark -- a large tuff cone which was formed by a short series of explosive eruptions some 100,000 years ago; National Natural Landmark. Picnicking on the crater floor in a landscaped meadow; detachment from the city. Moderate family hike (bring a flashlight) with panoramic view of Honolulu; trail 0.7 mile one-way and with some hazards. Viewpoint of Kahala plain. Park gate open 6 a.m. to 6 p.m.

How the Crater was Formed:8

The pronounced seaward summit, deeply eroded ridges, and ovoid-shaped crater are evidence of Le'ahi's (Diamond Head) very dynamic geological history. The creation of O'ahu began around 2.5 to 3 million years ago with volcanic eruptions from 2 shield volcanoes. A period of extensive erosion followed, leaving the Ko'olau and Wai'anae Mountain Ranges as the remnants of these very eroded volcanoes. After about 2 million years of volcanic inactivity, the southeastern end of the Ko'olau Range erupted. These eruptions occurred near the ocean where the magma was broken down into ash and fine particles by the water and steam. Blown into the air, these particles were cemented together into a rock called tuff which created tuff cones, such as Le'ahi. Le'ahi is believed to have been created about 300,000 years ago during a single, brief eruption. The broad, saucer-shaped crater covers 350 acres with its width being greater than its height. The southwestern rim is highest because winds were blowing ash in this direction during the eruption. Since the eruption, the slopes of the crater have been eroded and weathered by rain, wind, and the pounding of the sea. A coral reef now protects the seaward slopes of the crater. Today, Le'ahi is the most recognized landmark in Hawai'i. It was designated a National Natural Landmark in 1968 as an excellent example of a tuff cone.

Nearest population center:  Honolulu

Hazard:  none, volcano extinct

The Island of Oahu is no longer over the Hot Spot that formed the islands of Hawaii

Crater 160, Arizona (Also called Coulton Crater)

Location: 35.5N, 111.6

Elevation: 6,232 feet (1,900 m)

Nearest population center:  Flagstaff, AZ  pop Coconino County:  the 2006 estimated population is 125000

Crater 160 is a composite cinder, tuff, and spatter cone. The cone is noted for the presence of ultramafic xenoliths. The cone has a three stage history. The initial eruption produced a build up of spatter on lava flows that are exposed in the bottom of the cone and in a d**e-like freature in the northeast wall of the crater. During the second stage the crater was deepened and widened and layers of tuff were deposited. The tuff contains the xenoliths. The final eruption was a fire fountain that produced the cinder cone. The cone is 100 feet (35 m) tall. Photo by Steve Mattox, 1989.

times erupted:  3 known

Hazard level:  none, volcano extinct