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Tectonics and motions of the 1906 San Francisco earthquake
San Francisco earthquake 1906
San Francisco earthquake 1906
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If you have ever been in areas where earthquakes are quite common you might realize the styles of building are different. There is a reason for this. They are “earthquake proof” meaning that if another great earthquake, such as the one in San Francisco, was to strike. Then the building would be protected. Back in 1906 we were still quite a very young country. We hadn’t a lot of knowledge of great natural disasters effecting large populations, like San Francisco, because there weren’t very many big cities to start with. California was still a fairly new state. The idea of the “California Dream” was just starting due to the huge success in the state’s; Agriculture, Film, and Shipping industries. San Francisco thrived on the shipping industry, it brought in population, and many of the structures were very poorly built. Much of the buildings were built on artificial foundations. …show more content…
In less than one minute the Pacific Plate shifted north 20 feet at speeds greater than 5,900 mph. The 40 second tremor was estimated to be an 8.3 on the Richter scale. This tore apart streets and buildings in its path, and structures that were in a 375,000 square mile area felt the effects of the shaking. The earthquake itself accounted for only a third of the damage. Fires began to breakout throughout the city, and were unable to be put out because; Sewer lines, water mains, rail ways were all broken during the earthquake. This left the fires untamed for three whole days, and in that time over 225,000 people were left homeless, and another 3,000 people were killed. The estimated cost in total damage was $400 million which today is about $8 billion
The 1906 San Francisco Earthquake hit the Northern California coastline. The San Andreas fault shook 296 miles of the coast causing major damage throughout San Francisco, destroying about 80% of the city. Fires broke out throughout the city that lasted for several days. This was one of the worst Earthquakes recorded in history, killing 3,000 people.("The Great 1906 San Francisco Earthquake")
Earthquakes are best described as a shaking or vibration of the ground caused by breaking of rock. Sometimes they are very strong and other times you would hardly notice them. This shaking occurs when stress that builds up in the crust is suddenly released as the crust breaks free and/or slides against the other pieces of crust. Earthquakes may also be thought of as the breaking of a popsicle stick by applying pressure to both ends at the same time. Should you try this experiment , you will feel the pressure build up as you apply more force until the stick snaps. When the stick snaps you will feel an instant of pain at your fingers as the stress reduces and energy waves move throughout the stick. When the earth's crust is placed under similar types of stress, binding as the stress builds, it will also snap and release the energy into the surrounding rocks, 'ooch'. Thinking about earthquakes will become more clear if you try another experiment.
Earthquakes in California are certainly not a surprise. What is a surprise is their unpredictability and randomness. Geologists say there is roughly a 50 percent chance that a magnitude 8 or more quake will hit the Los Angeles area sometime over the next 30 years. And, over the past twenty years, the Los Angeles area has witnessed several earthquakes, and in particular, two that were quite devastating; the 1971 San Fernando earthquake, and the January 17, 1994, Northridge Earthquake. Given the certainty that earthquakes will occur, they still seem to come as a surprise, and leave many communities unprepared to deal with their aftermath.
"The Great Quake: 1906-2006 / Rising from the Ashes." SFGate. N.p., n.d. Web. 10 May 2014.
The 1906 San Francisco earthquake was one of the largest earthquakes in the United States. Even though it only lasted less than a minute, the damages and aftermath of the earthquake were disastrous. These damages were not just from the earthquake, but also from other hazards that occurred because of it. It also had a huge effect on the people living in San Francisco. Many people, the government, and other countries helped the city of San Francisco with relief goods like food and clothing. The city used up their resources in order to rebuild the city and spent a lot of money. This earthquake also started a scientific revolution about earthquakes and its effects.
TOHOKU, Japan, Friday, Mar. 11 -Yesterday, a 9.0 magnitude Earthquake struck the east of Tohoku, Japan. The epicentre of the earthquake was located approximately 72 km east of Tohoku (38.3 degrees North latitude and 142.4 degrees East longitude), or 130 km east of Sendai as shown by the X in figure 3 below. The focus of the earthquake was 24.4 km under the epicentre. The earthquake therefore caused a tsunami due to the displacing of water above the Pacific Plate. The earthquake and tsunami together have caused approximately 20,000 deaths, 6152 injuries and 2500 people missing. Approximately 90% of these deaths were by drowning. Approximately 140,000 people have been displaced and over 500,000 buildings and structures have been destroyed or damaged. The early warning system of Japan stopped many bullet trains, and many residents received texted warnings of the earthquake and tsunami on their mobile phones giving them time to evacuate. Figures 1 and 2 show exactly how destructive the tsunami caused by the Tohoku Earthquake was.
The newly formed state of California, influenced mainly by the Gold Rush starting in 1848, sent the population drastically sprawling upwards. As more and more people established residency in the future area of San Francisco, area leaders officially recognized San Francisco as a city in 1856. The invention of the cable car in the late 1880s helped facilitate traversing the city’s steep hills, which ended up allowing people to live farther from work and use transportation into the heart of the city. San Francisco started out with a base population of approximately 30,000 people and increased to roughly 13 times that size by the time that the earthquake struck the city in 1906. The earthquake and fires greatly exposed the poorly constructed buildings of previous years. The destruction of San Francisco from the earthquake and fires of 1906 allowed for a newly reconstructed city with bigger and better buildings that attracted more business thereafter.
What have they learned since the quake quite allot. The fault moved in a fashion that geologists of
Ten million California residents who lived closely from the major fault lines could have been endangered in many extreme ways. (House, 56). A tragic thing was that after the earthquake a multitudes of fire followed right after. The situation led to the water mains being destroyed and the firefighter being left with no water to settle the growing fire which continued blazing. The bay water was planned on putting all of the dure out but it was to far in distance to be able to transport it (Earthquake of 1906, 2). The firefighters who were putting out the fire were either surrounded or being burned by the fire that was blazing in all directions (San Francisco Earthquake, 2). A resident who was present during the event mention that he/she saw men and women standing in a corner of a building praying, one person who became delirious by the horrific ways that were surrounding him while crying and screaming at the top of his lungs “the Lord sent it, the Lord”. Someone also mentioned that they experience themselves seeing Stones fall from the sky and crushing people to death. Reporters say there were 100 cannons going off (San Francisco Earthquake, 3). People who lived fifty miles away from the fire was able to “read the newspaper at
The Great Kanto Earthquake also known as the Tokyo-Yokohama Earthquake of 1923 hit the metropolitan area of Kanto on September 1st, 1923 around 11:58 pm. It was a 7.9 on the Richter magnitude scale, killing over one-hundred and forty thousand people due to its high magnitude and the time it happened. The earthquake struck around lunch time, when many Japanese people were at home cooking at their charcoal or gas fueled stoves. At the moment the earthquake hit, it knocked down buildings that caught flames from the stoves that fell over, enflaming the city. The fire was swept up and able to spread due to the gusts of wind that occurred for two days afterwards, resulting in firestorms. Charles Blauvelt experienced the ordeal of the fire describing the flames as “[covering] the whole city [as they] burned all day and night.” In addition to the firestorms and the earthquake itself, there was a shock because of all the fallen debris which triggered tsunamis to fill and flood Japanese cities. These tsunamis, that were about thirty feet tall, destroyed central Tokyo and immensely added to the death toll.
Hazards pose risk to everyone. Our acceptance of the risks associated with hazards dictates where and how we live. As humans, we accept a certain amount of risk when choosing to live our daily lives. From time to time, a hazard becomes an emergent situation. Tornadoes in the Midwest, hurricanes along the Gulf Coast or earthquakes in California are all hazards that residents in those regions accept and live with. This paper will examine one hazard that caused a disaster requiring a response from emergency management personnel. Specifically, the hazard more closely examined here is an earthquake. With the recent twenty year anniversary covered by many media outlets, the January 17, 1994, Northridge, California earthquake to date is the most expensive earthquake in American history.
While the early warning saved thousands of people, the Japan’s Meteorological Agency underestimated this earthquake as the subduction zone of Japan should not produce the magnitude 9.0 quake (Oskin, 2013a). The Tohoku Earthquake and its tsunami approximately killed 16 thousand people, injured 6 thousand people and around 3 thousand people were missing. Most people died from drowning. Around 300 thousand buildings, 4000 roads, 78 bridges, and many more were affected by the earthquake, tsunami, and fires from leaking oils and gas. Electricity, telecommunication, and railways were severely damaged. The debris of 25 million tons was generated and carried out to the sea by water (BBC News, 2012). The country’s authorities estimated more than 309 billion US dollars of damages. Landslides occurred in Miyagi and liquefaction in Chiba, Tokyo, Odaiba, and Urayasu (USGS, 2013). Furthermore, the tsunami destroyed protective tsunami seawalls. Approximately 217 square miles of Japan covered in water (Oskin,
In the early morning hours on January 17th, 1994 a very violent tremble took place across Los Angeles, California area that left fifty-seven people dead, more than 7,000 injured, more than 20,000 homeless and left over 40,000 buildings damaged. Around 4:30 a.m. a horrific 6.7 magnitude earthquake, that tested building codes and earthquake-resistant construction, shook Los Angeles, San Bernardino, Ventura, and Orange Counties with the most intense damage occurring in Sherman Oaks and Northridge. The earthquake caused several bridges and overpasses to collapse closing sections of the Santa Monica Freeway, Simi Valley Freeway, Golden State Freeway, and the Antelope Valley Freeway. There were also several fire outbreaks throughout the San Fernando Valley, Malibu, and Venice area because of underground gas lines that had been ruptured during the earthquake that caused additional damage.
Earthquakes are vibrations felt at the surface of the earth which are caused by disturbances of the energy in the earth's interior. These vibrations are known as seismic waves. (Skinner Robinson McVerry 1) There are different type sof seisimc waves such as Primary (P) waves, whcih travel the fastest, Secondary (S) waves which cause the earth to vibrate vertically, Surface (L) waves. P and S waves are "affected by changes in the density and the rigidity of the materials through which they pass." (Columbia Encyclopedia) Earthquakes vary in their intensity and duration. Often times they are strong enough to cause massive destriction. Tall buildings often suffer as a result of these natural disasters. In recent years this has become a larger and larger threat with both the number of large buildings, and their number of occupants increasing. In an effort to try to minimize the damage caused by earthquakes many some engineers focus primarily on designing and constructing earthquake resistant buildings. Earthquake engineers have gathered much of their information from analyzing past earthquakes, and learning which buildings can and can't withstand the tremors. The goals of these engineers is to design buildings that can withstand moderate earthquakes and obtain minimal damage, and that the buildings will not collapse lowering the probability of human deaths.
It was a beautiful day like any other with the clear blue sky and the