0000002658 00000 n 0 Use this information to complete the following. When the tension becomes too great, the fault slips, causing an earthquake. Have students turn in their answers for the Explain portion of the worksheet. 0000003254 00000 n 0000003991 00000 n All the arcs should intersect at a common point - the epicenter. Nov 2, 2020 Triangulation is used to determine the location of an earthquake. American Geosciences Institute. Sharing Information/Thinking Ahead: In the Evaluate section of the worksheet, student pairs are asked to compose answers to two questionswhether they think seismology is a reliable science and ways seismic data is useful for engineers. long will it take, to the nearest 0. minutes, for the first P waves to travel from the epicenter to your station? Develop a solution to a technological problem that has the least negative environmental and social impact. d>(ZvO= The American Geosciences Institute represents and serves the geoscience community by providing collaborative leadership and information to connect Earth, science, and people. Then locate and click the link in the center of the page under the question: "How is an earthquake epicenter located and how is magnitude determined"? Though they may weaken with distance, seismographs are sensitive enough to still detect these waves. (5 minutes) Discuss how gathering information on epicenters can be applied. If the lag time were measured at a location closer to the epicenter, how would it compare P and S arrivals, you can now locate an earthquake your answers below. For lower grades, just introduce the concepts of triangulation and the magnitude scale; a thorough understanding of P and S waves is not vital. (Source: USGS, Wikipedia). 0000004769 00000 n [*aiLG?+J\QI86~}ooRrr!pm}dk@dBbZPMZlC4C\9^ SM.R\!H+$|+DUzt^w{" %&{KXjT'9yzT^UFe:+f(`PU_9%EW@\)?i qp!\G Z endstream endobj 75 0 obj <>stream A circle is drawn from each of the three different seismograph locations, where the radius of each circle is equal to the distance from that station to the epicenter. As discussed earlier in this lesson, this method of determining the epicenter of an . 0000003855 00000 n Though the distance to the epicenter can be determined using a travel-time graph, the direction cannot be told. These distances are determined using a travel-time curve, which is a graph of Pand S-wave arrival times (see Figure 13.11). 1) Identify the general term for waves released from an earthquake. PDF Locating An Earthquake Epicenter Lab Answers - Full PDF Mapping the history of natural hazards in a region, combined with an understanding of related geologic forces can help forecast the locations and likelihoods of future events. View Notes - Locating_an_epicenter_activity from SCIENCE Earth Scie at Toms River High North. Richter scale Method of earthquake measurement based on the amplitude of seismic . Triangulation is required to determine exactly where it happened. EARTHQUAKES: Epicenter Determination and Seismic Waves First locate and mark the three seismic stations on the world map provided below. /g$=#!$EbBbhD!,x so^6Uc})\uJs=fyY}j'|YjTm8B_[}*Ovm\[J'.mu?lQg,wzJM^X&P w>-T%*h%J4 yB@VPmP]@D------------,2dfY$"A!ANAASi)4$dniiiinH% Gxt5DJ) )9RRr$II'y ??O's^3@[{*{VT?nsNS!ilq]mFO?? question 1 of 3. 11 minutes elapsed between the first P wave and the last measurable surface wave. An earthquake is what happens when two blocks of the earth suddenly slip past one directly above it on the surface of the earth is called the epicenter. They use three seismographs in a process called triangulation to determine earthquake epicenters.
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activity 4 locating an earthquake epicenter answer key