One of the worst natural disasters in United States history to this date occurred almost 109 years ago. On April 18, 1906 at 5:15am in San Francisco, California, the earthquake of San Francisco occurred hitting between 7.9 and 8.3M on the Richter scale. The San Andreas Fault, which is about 600 miles long, running from the Gulf of California to Cape Mendocino and is an active strike-slip fault, cut through the continental lithosphere to cause the San Francisco Earthquake of 1906. An earthquake is a trembling or shaking of the ground produced by movements along a fault (Strahler, 2012). After the tension is released at a critical point, the fault or tectonic plate slips and relieves the strain and creates the seismic waves, which radiates out in all directions causing the shaking of the surface.
Earthquakes occur almost all over the world and often cause many casualties and injuries, but it is a common misconception to think that all earthquakes or even most of them cause destruction. In fact, most earthquakes aren’t even strong enough to be felt by humans and most animals, and can only be recorded by seismometers that are strategically placed in all corners of the world in order to get a reliable and precise reading on the earthquakes strength. Another common misconception about earthquakes is that people believe that the injuries and deaths that result from earthquakes are because of the earth’s shaking itself, whereas it is in fact usually because of heavy items falling from the incessant vibrations. Earthquakes can be defined as
really trying to predict. Earthquakes happen all the time, but what we are really trying to figure out how to predict is when a
An earthquake occurs when there is a shaking of the Earth, caused by a buildup of energy in volcanic or tectonic form (“Earthquakes”). Essentially, an earthquake results from sections of the Earth moving, causing slippage. When two chunks of the Earth slip past each other, the point at which this happens is called the fault plane. In fact, an earthquake begins in the hypocenter beneath the Earth’s surface. Next, located right above the hypocenter is the epicenter (Wald). And finally, the main, and most important thing to remember about earthquakes is that they are random, and extremely hard to predict (“Earthquakes”).
Earthquakes, by Webster’s dictionary definition, are, “a shaking or trembling of the earth that is volcanic or tectonic in origin.” World Book Encyclopedia reports scientists believe that more than 8,000 earthquakes occur each day without causing damage. A little more than 1,000 each year are strong enough to be felt. Earthquakes occur in the general sense, anywhere on land. Other earthquakes go by different names, such as volcanic eruptions and tsunamis, large tidal wave storms that occur underwater, primarily in the Pacific Ocean.
Mr. Adams describes the San Francisco earthquake as his most profound human suffering experience because the horror of shaking floors, parts of his mom’s house collapse to the floor, and got a broken nose from stumbling into a brick wall (Ansel Adams & The 1906 Earthquake 2008). Earthquakes are part of natural disasters of the earth and normally caused by shaking the ground and rapid movement of one block of rock slipping past another along fractures in the earth crust called faults. Faults are usually locked excluding abrupt movements with slippage that create earthquakes (Lutgens, F. & Tarbuck,
From studying the science behind the San Francisco earthquake, scientists have made a number of important discoveries involving how earthquakes function. At 5:12 on a fateful April morning in 1906, the mammoth Pacific and North American plates sheared each other at an incredible twenty-one feet along the San Andreas fault, surpassing the annual average of two inches (“San Francisco Earthquake of 1906”) (“The Great 1906 Earthquake and Fires”). A few seconds later, the destructive earthquake occurred. The ground shifted at almost five feet per second, and the shaking could be felt all the way from southern Oregon to southern Los Angeles to central Nevada (“Quick”) (“The Great 1906 San Francisco Earthquake”). In fact, the earthquake could be registered in a seismograph on Capetown, South Africa, an astounding 10,236 miles away...
Since record keeping began, sometime in the 18th century, there have been 13 major earthquakes along the San Andreas Fault. However, radiocarbon dating has proved that earthquakes have been happening along the fault for thousands of years. The earliest recorded earthquake happened on July 28, 1769, and was experienced by Spanish explorer Gaspar de Portola while he camped along a small lake he named “San Andreas Lake”. Other notable early earthquakes occurred in 1836, 1838, 1865, 1868, and 1890. Unfortunately, there is no seismographic data recorded for these early earthquakes since it was not until 1887 that seismographs began being used in the United
As stated from the article, “San Andreas Fault Facts” it states, Parkfield, in central California, pops off a moderate earthquake of around magnitude 6 every couple decades, and is a center for earthquake research. It was the site of the first official earthquake prediction by the U.S. Geological Survey” (Oskin). Throughout research we have a general idea of what is time come but the center for earthquake research still has a lot more work to do. But just because they predict it does not necessarily mean it will come true. As Stated from the article, “Scientists predicted another earthquake should occur in 1993, but it didn't happen until 2004” (Oskin). No matter the amount of time and research we put into we still do not have a direct date. It is a crazy thought to think that with so much research and facts that scientist would be wrong but that is the beauty of earthquakes. As stated from the article, “What will really happen when San Andreas Unleashes the Big One” it states, “While seismologists can’t predict exactly when that will happen, every few years they release a forecast for the likelihood of such an event” (Zielinski). It seems as if this is as far as we will be getting as a date for when this earthquake will occur. We may not have an answer but soon is definitely one of
An earthquake is what happens when two blocks of the earth suddenly slip past one another. The surface where they slip is called the fault or fault plane. The location below the earth’s surface where the earthquake starts is called the hypocenter, and the location directly above it on the surface of the earth is called the epicenter.
The length and severity of an Earthquake does vary. Much in the way lightning is a preemptive sign that thunder will follow, foreshocks are a preemptive sign that a major Earthquake will follow. Foreshocks are small Earthquakes that last anywhere from years to hours before a major quake. When foreshocks have been monitored for making predictions it has had mixed results but if nothing else they do allow people to prepare for the potential disaster that may follow. Once that major quake does follow it can last seconds or minutes and the damage can be nil or severe. If severe then the aftershocks that follow can bring down structures that were badly damaged from the major quake. This whole process is repetitious, taking place along faults with powerful quakes once every two years and moderate quakes averaging 40 per year. Scientists’ estimate more than 8,000 minor quakes take place each day but do not cause any damage.
An earthquake is the shaking of the ground caused by sudden release of energy inside the earth's crust. It's the breaking and moving of tectonic plates along a fault line. Earthquakes can range in size from weak where we don't feel them to extremely violent where they actually thow people around and destroy cities. They may be a result of geological faults or other activites such as volcanoes, landslides, mine blasts and nuclear tests. An earthquake is not always naturally caused.
“Earthquakes are one of the most potent natural powers on earth and regularly affect people around the world. Unlike often equally destructive severe weather events such as hurricanes and tornadoes, earthquakes can hit at any time. Earthquakes can also have a array of magnitudes with the strongest having disturbing consequences for the zones where they are concentrated, nearby areas, and even some far away in the instance of earthquake-generated tsunamis” (Briney 1). We think that the ground beneath us is unmoving but the earth’s crust is constantly moving and the destructive forces caused by this moving are called earthquakes. I will be talking about several topics: What causes earthquakes, two types of earthquakes, what their affects are, and what we are doing to predict future earthquakes.
Before examining the Northridge event, understanding the naturally occurring hazard that is an earthquake will help to better understand exactly what happened and why it was such an important geological event. With four distinct layers, two layers, the crust and upper portion of the mantle, compose the skin that is the surface layer of the Earth. The crust is not a single, continuous piece. It is actually several different pieces, or plates, that come together to form the puzzle that comprises the surface of the Earth. These plates are in constant motion rubbing against one another. These areas, known as fault lines, where the plates rub up against one another have spots where one plate ”gets stuck while the rest of the plate keeps moving. When the plate has moved far enough, the edges unstick and is how most of the earthquakes around the world occur” (Wald, 2012). The energy stored from the friction of the two plate...