San Francisco Earthquake of 1989
The Loma Prieta earthquake was a major earthquake that struck the San FranciscoBayArea
in October 1989. The quake lasted for 10-15 seconds. It was measured 6.9magnitude
scale.
The quake killed 63 people throughout northern California, injured 3,757,
and left some 3,000
to 12,000 people homeless.
Aerial view of collapsed sections of the Cypress Viaduct of Interstate
Highway 880
(L) ShakeMap of the 1989 Loma Prieta earthquake (R) Collapsed upper deck
section of the San Francisco-Oakland Bay Bridge
The bridge consists of 10 lanes, that is 5 westbound on the upper level
and 5 eastbound on the lower level.
California State Route 1 highway collapsed after the Loma Prieta earthquake.
(L) A damage to the Marina District following the Loma Prieta earthquake:
In the 1989 earthquake, the water-saturated unconsolidated mud
and sand suffered liquefaction, and the earthquake's vertical shock waves
rippled over the ground more severely.
(R) A car was crushed by the third floor of a collapsed apartment building.
(L) A Collapse of the Cypress Street Viaduct
(R) Because of improper rebar ( reinforcing steel ) placement, the columns
broke with ease, sending the structure down.
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San Francisco Earthquake of 1906
The San Francisco earthquake of 1906 was a major earthquake that struck
San Francisco and
the sea coast of Northern California at 5:12 a.m. on April 18, 1906. The
most widely accepted estimate
for the magnitude of the earthquake is a moment magnitude of 7.9. However,
other values have
been proposed, from 7.7 to as high as 8.25.
The burning of San Francisco, April 18, 1906
San Francisco Earthquake of 1906: Ruins in vicinity of Post and Grant Avenue
(L) Houses were damaged by 1906 San Francisco Earthquake. (R) The intensity
map of the 1906 Earthquake
This picture was taken in the morning struck after the earthquake in 1906.
It shows fire and people at Sacramento Street and Miles Place (now Miller
Place) near Powell Street, by Arnold Genthe.
※All above pictures are copyright-free.
1906年4月18日午前5時12分、サンフランシスコ地震がサンフランシスコ市内及びカリフォルニア北部を襲った。
建物は倒壊し、破裂したガス管が引火して火災が発生し、数日間にわたって街中を焼き尽くした。
街の4分の3以上が灰燼に帰し、ダウンタウンの中心部はほとんど消失した。
A computer-calculated earthquakes through-time display by Dr. A Jones,
as of June 2012
USA 2012
Seattle 01 Seattle 02 Amtrak to Glacier National Park Glacier National Park Grand Teton National Parks
Yellowstone National Park 01 Yellowstone National Park 02 Smoking ban in National Parks
San Francisco 01 San Francisco 02 Hotels in San Francisco UCSF Medical Center
Smoking control in Midwestern US and at San Francisco
Earthquake in USA and Japan
サンフランシスコ大地震
2012年7月執筆 医学博士 宮本順伯
★This Web site is link-free.
This article was written by Junhaku Miyamoto, MD, in July 2012.
