Earthquakes
Published on Nov 18, 2015
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EARTHQUAKES
ALLISON ASPLIN, MEGAN SCHAFER, MATTIAS KENT, CHRIS KELLEY
What is an earthquake?
Earthquakes are defined as a vibration of the earth's surface that occurs after a release of energy in the earth's crust.
Photo by dsearls
Because the earth's crust is made up of numerous segments or "plates" that are constantly moving slowly, vibrations can occur and result in small earthquakes. Most earthquakes are quite small and are barely felt. Larger and more violent earthquakes are those that occur in a release of energy as the plates slide past or collide into one another.
Photo by dsearls
THE RING OF FIRE
Nearly 80% of Earth’s largest earthquakes occur near the “Ring of Fire,” which is a horseshoe-shaped region in the Pacific Ocean where many tectonic plates meet. The second-most earthquake-prone area is a region called the Alpide Belt, which includes countries such as Turkey, India, and Pakistan.
The largest recorded earthquake in the world was a magnitude 9.5 (Mw) in Chile on May 22, 1960. There was a $500 million damage to the South of Chile. It cost 50 trillion dollars to rebuild Chile after the earthquake.
Photo by Danny Choo
The gulf of Alaska was devastated by the Prince William sound Earthquake with a 9.2 magnitude that caused landslides and anchorage and raised parts of outlining islands by as much as 11 meters. The resulting tsunami reached heights of 67 meters as it swept into the shallow Valdez inlet and was responsible for most of the 128 deaths and 311 million dollar damage.
March 28th, 1964, Prince Williams, Alaska
August 15th, 1950
Assam, Tibet
Magnitude: 8.6
70 villages simply disappeared in this string of disasters generated by an earthquake with an epicenter in Tibet, Arima. Across the region, landslides claimed the lives of 1,526 people and rendered parts of the landscape unrecognizable from the air. It cost $25 million for the damage.
Photo by dsearls
Rat Islands, Alaska
February 4th, 1965
Magnitude:8.7
On Adak Island, cracks occurred in prefabricated wood buildings; on Shemya Island, cracks were observed in an asphalt runway. Hairline cracks also formed in the runways at the U.S. Coast Guard Loran Station on Attu Island. This earthquake generated a tsunami reported to be about 10.7 meters high on Shemya Island. Loss caused by flooding on Amchitka Island was estimated at about $10,000. About 20,000 people died. 1,172 were injured.
Photo by Buzz Hoffman
January 17th, 1994
Cost: $44 billion
The 6.7 quake that hit California, San Fernando valley, has come to be known as the "north ridge quake. "Only about 15 billion of the damage was covered by insurance policies. It killed 60 people and injured more than 7,000.
Photo by Stuck in Customs
