Analysis of NYS Earthquake
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1 Analysis of NYS Earthquake NAME INTRODUCTION An earthquake s strength depends on how much of the energy stored in the rocks is released. There are two methods of identifying the intensity of an earthquake. One is quantitative (a measurement involving quantity, or amount, of energy released during an earthquake), the other is qualitative (a description of the observations made during an event). The Richter Scale is a quantitative analysis of an earthquake. The Richter Scale correlates the amplitude of the largest peak traced on a seismogram during a quake to the amount of energy released by the quake. Each successive unit is 10 times stronger than the previous. For example, a Richter Scale magnitude of 5 is 10 times stronger than a Richter Scale of 4. There is no upper limit on the Richter scale, but virtually all rock types would fail and release their stored strain energy before accumulating enough energy to produce an earthquake of 9.0 on the Richter Scale. Therefore, 9.0 to 9.5 appears to be the effective upper limit of the scale. Before Mr. Richter developed his scale, damage reports were based on a comparison of observations of intensity. Until 1902 when Giuseppe Mercalli developed a standard list of increasing levels of damage to human-made structures there was no set scale for comparison. Mercalli s scale made it possible to rank earthquakes by intensity. However, his scale is not adequate for distinguishing an extremely strong earthquake that occurred far away from a less severe event that occurred close by. This activity is based upon the Mercalli Intensity Scale (see page 2). PROCEDURE 1. Using the Mercalli Intensity Scale, complete the data table of earthquake observations from the April 20, 2002 earthquake that occurred in New York State. 2. Plot the intensities on the New York State map on page 3, using the appropriate Roman numeral. 3. Plot isolines showing areas of equal intensity. 4. Place a X on the map to indicate the location of the epicenter of the earthquake. Peggy Warren, Kendall Jr. Sr. High School 1
2 ANALYSIS AND CONCLUSION 1. The towns of Hamburg, Elmira, and Windsor all reported feeling nothing. Based on your knowledge of rocks and the ESRT, suggest a possible explanation for the observers to have felt nothing. 2. The observer in Salt Point also reported feeling nothing and offered something of an explanation. Explain in your own words what the significance of a peat moss bog is. 3. According to the ESRT, in which landscape region of New York State was the epicenter of this earthquake. Support your answer with data. 4. The Pittsford observer reported that their house sits on glacial till. What effect, if any, would the type of soil have on the observations made? (HINT: Look up the meaning of glacial till in a textbook!) Peggy Warren, Kendall Jr. Sr. High School 2
3 New York Earthquake - 4/20/02-6:50:44 am - 44 o 30' N, 73 o 40' W LOCATION LAT/LONG OBSERVATIONS MERCALLI SCORE Red Creek 43 o N, 77 o W bed shook, knickknack almost toppled over, all people in the house felt it Baldwinsville 43 o N, 76 o 30' W felt the bed shake, house creaked Ballston Spa 43 o N, 74 o W bed shook Laurens 42 o 30' N, 75 o W felt shaking Salt Point 42 o N, 74 o W felt nothing, backyard is a peat moss bog Hamburg 43 o N 78 o 45' W felt nothing Binghamtom 42 o N, 76 o W whole house swayed Massena 45 o N, 75 o W house shaking, windows rattling, at first thought it was a huge wind gust Saranac Lake 44 o 30' N, 74 o W pictures fell off walls, cracked plaster, stones fell from house façade Howard Beach 42 o N, 73 o 30' W bed shaking, car alarms set off, rumbling like a low-flying plane Saratoga Springs 43 o N, 74 o W IV Elmira 42 o N, 77 o W felt nothing Massena 45 o N, 75 o W IV Ossining 41 o N, 73 o 30' W woke people up, rattled some things on 2nd floor, bookcases rocking Middle Grove 43 o N, 74 o W IV Plattsburg 44 o 45' N, 73 o 30' W chimneys down, bridge closed Jay 44 o 30' N, 74 o W chimney down Cooperstown 42 o 45' N, 74 o 75' W IV Oneonta 42 o 30' N, 75 o W III North Rose 43 o N, 77 o W IV Queens 41 o N, 73 o 45' W bed shook, walls creaking, felt on 3rd floor of brick building Napoli 42 o N, 79 o W furniture shaking and rattling, people awakened AuSable 44 o 45'N, 73 o 30' W road partially collapsed, chimneys down Baldwinsville 43 o N, 76 o 30' W walls creaked Binghamtom 42 o N, 76 o W IV Ballston Spa 43 o N, 74 o W road damaged Plattsburg 44 o 45' N, 73 o 30' W V Marathon 42 o N, 76 o W awakened when on 2nd floor, heard rumbling Windsor 42 o N, 75 o 30' W felt nothing Slate Hill 41 o N, 75 o W awakened people on 2nd floor, felt like someone had landed on the roof Pittsford 43 o N, 77 o 30' W bed shook, knickknack almost toppled over, all people in the house felt it Peggy Warren, Kendall Jr. Sr. High School 3
4 Peggy Warren, Kendall Jr. Sr. High School 4
5 Peggy Warren, Kendall Jr. Sr. High School 5
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