Earthquakes in General <ul><li>An earthquake is a sudden release of energy under the earth’s crust, that creates seismic waves </li></ul><ul><li>Power of quake is measured on the Richter scale 1 being the lowest 7 the most powerful </li></ul><ul><li>Powerful 7 earthquakes can create severe structural damage over a large area </li></ul>
Earthquakes cont. <ul><li>Aftershock is a second shake felt after the main earthquake </li></ul><ul><li>Earthquakes can occur anywhere in the United States but mainly occur in California and Alaska </li></ul><ul><li>Earthquakes occur on fault lines in the ground. The 3 types are: </li></ul><ul><li>1.Reverse (thrust) </li></ul><ul><li>2.Normal </li></ul><ul><li>3.Strike-Slip </li></ul>
Pennsylvania Earthquake Activity <ul><li>Earthquakes first recorded earthquake was in 1737 </li></ul><ul><li>PA has low earthquakes when compared to the rest of the country </li></ul><ul><li>PA’s largest earthquake was on March 8, 1889. It measured 5 on the Richter scale and was felt in Harrisburg, York, and surrounding areas. </li></ul>
PA’s Earthquakes cont. <ul><li>The picture to the left is one of the areas last earthquakes on December 31 st . </li></ul><ul><li>While researching for this project on occurred in Lancaster on April 24 th . It ranked a 2.4 on the Richter scale </li></ul>
PA Earthquakes cont. <ul><li>In 2008 there were 28 earthquakes in Pennsylvania. </li></ul><ul><li>Recently a lot of activity has been occurring in the Lancaster area. </li></ul><ul><li>In the next slide you will see a video of an earthquake taking place and the damage they can cause. </li></ul>
Minor earthquake shakes Lancaster <ul><li>Lancaster More than 1,000 people called the Lancaster County 911 center after a minor earthquake shook the area. A dispatcher with the Lebanon County Emergency Management Agency said dispatchers there also got a few calls from the Cornwall and South Lebanon Twp. areas. A Cumberland County dispatcher said the center got at least one call from someone who felt it in the Mechanicsburg area. The U.S. Geological Survey says the 3.3-magnitude quake hit early Saturday morning, a few moments after midnight. It was centered just outside Lancaster. Many who called local newspapers or 911 thought there had been an explosion nearby, but there were no reports of injuries or severe damage. </li></ul><ul><li>News article taken from the patriot on December 27 th ,2008 </li></ul>
What can be done? <ul><li>Research is being done to look into how to prevent earthquakes from occurring but little progress has been made. </li></ul><ul><li>In places where earthquakes are severe there are structural changes that can be made to your house. </li></ul><ul><li>Mainly the best advice is to keep all items such as furniture, light, and appliances secure and fastened. </li></ul>
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