So next, students compute the magnitude of this same earthquake by looking at the three simplified seismograms again, but this time selecting each's maximum S wave amplitude (height). Do you agree with this alignment? Last modified July 18, 2012. Video Guide / Worksheets and Quizzes for Quizzes and Answer Sheet __ 2. The simulation renders three circles on a map and directs students to find the epicenter. For upper grades, have students work individually, do two of the three seismic area tutorials, and look up historical earthquakes to learn their magnitudes, and make data tables or graphs with this information. In order to determine the location of an earthquake epicenter, seismographs from at least three different places are needed for a particular event. ' endstream endobj 69 0 obj <> endobj 70 0 obj [85 0 R] endobj 71 0 obj <> endobj 72 0 obj <> endobj 73 0 obj <>stream long will it take, to the nearest 0. minutes, for the first P waves to travel from the epicenter to your station? A. Seismic waves-waves generated by an earthquake, can move the ground forward and back- answers the question. Finding the epicenter worksheet answer key. BDF endstream endobj 74 0 obj <>stream Earthquakes Living Lab: Finding Epicenters & Measuring Magnitudes. 0000004511 00000 n This page titled 13.4: Locating an Earthquake Epicenter is shared under a CC BY-SA license and was authored, remixed, and/or curated by Deline, Harris & Tefend (GALILEO Open Learning Materials) . Copyright 2023. 12), Seek, evaluate, and use a variety of specialized resources available from libraries, the Internet, and the community to find scientific information on Earth's history How are S and P waves used to determine how far away epicenters are? 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. Explains how to find an earthquake epicenter using at least three seismograph stations. P and Swaves are body waves and travel, through the interior of the earth. Through the online Earthquakes Living Lab, student pairs explore various types of seismic waves and the differences between shear waves and compressional waves. Take a few minutes to read the information on the left side of this page for the 2010 earthquake off the coast of central Chile. In this activity, students use an online simulationVirtual Earthquakethat is accessible through the Earthquakes Living Lab interface, to locate the epicenter of an earthquake by making simple measurement on three seismograms, recordings of an earthquake's seismic waves detected by instruments (seismographs) far away from the earthquake. HTn {0,`K6}(J6]&Q^"!q57y_VQ9fp3/?Mc=KGsrrt:c\$Lh`4}>C>`qcSj0[YpZ_Su(322/N Z./$E )H %C[5ph[BUyGh7|!XPQiDjJ(|BNvylk+g;9G(#Aby>Jcf`XmnwtDD+;Z^I&Sb-4!7oi` L7 endstream endobj 78 0 obj <> endobj 79 0 obj <>stream If you draw a circle on a map around three different seismographs where the radius of each is the distance from that station to the earthquake, the intersection of those three circles is the epicenter. Richter scale Method of earthquake measurement based on the amplitude of seismic . 0000003855 00000 n Looking at the nomogram, students click on each location data point to see where the three lines intersect to read the estimated magnitude. (Grades 9 - 12). What did it feel like? consider a seismograph stationed 3, =Cv :~4yrXP 62{_,*Uq/O-oUNBr-$y~:G},#3e^CS6U*_zVGY7ZNUWk2f?? {%!,"{u5E&OOqA_"/uxn-kx+Vz*EQb)Q to the lag time measured at this location? (Listen to student ideas.) Find 23 millimeters on the right side of the chart and mark that point. While no one can predict earthquakes, knowing the intensities, frequencies and locations of past earthquakes and fault planes helps us to better anticipate the locations and forces to expect, so we can do our best to prepare our communities and infrastructure to withstand them safely. PDF. travel time for P waves. Before going to the classroom, you will need to: Provide each student, with the following: Earthquakes occur every day all over the United States and all over the world. P wave: The first seismic wave of an earthquake. The spot where those three circles intersect is the epicenter (Figure 13.12). Fill Locating The Epicenter Of An Earthquake Worksheet Answers, Edit online. Sixty-seven people lost their lives, and property damage was estimated at $6 billion. How many minutes elapsed between the arrival of the first P wave and the last measurable Tracings made at three separate seismic stations are needed to locate an earthquake epicenter. Conclude the activity with a class discussion (and perhaps homework questions) to share ideas and answers, as described in the Assessment section. Quick Tips. technology, engineering or math (STEM) educational standards. Section A - Operator Information 1. An earthquake is the violent movement of tectonic plates in the Earth's crust. 0000006011 00000 n 17 Station St., Ste 3 Brookline, MA 02445. Have students click on the Earthquakes Living Lab hyperlink in the top left in the earthquakes section. 0000001562 00000 n They use three seismographs in a process called triangulation to determine earthquake epicenters. What data is used to determine magnitude? Free K-12 standards-aligned STEM curriculum for educators everywhere. P wave. https://people.wou.edu/~taylors/gs104/lab5key.pdf Locating Earthquake Epicenters | CK-12 Foundation Apr 8, 2020 . Millions of people witnessed the motion of the earthquake on television. Empirical evidence is required to differentiate between cause and correlation and make claims about specific causes and effects. Figure 13.10). Identify P, S, and surface waves on seismograms, Measure amplitude and lag time on seismograms, Use triangulation to accurately locate the epicenter of an earthquake, Accurately report the latitude and longitude of the epicenter, Sea Floor Lab Help with Problem 2 - Tagged, Metamorphic Rocks Lab Instructions - Tagged, Lab exam 2 - Study guide for the second exam regarding all the labs and material covered, Redaccion de textos II Marco n membrete es aquello que se ubica en el sector superior de una pgina, mencionando el ttulo o el nombre de un individuo, una empresa, etc. seismograph: An instrument that measures motions of the ground, including those of seismic waves generated by earthquakes. Wikipedia, The Free Encyclopedia. Use mathematical representations of phenomena or design solutions to describe and/or support claims and/or explanations. (, Find the S-P interval for each seismogram and record answers in the S-P column of, Find the distance to the epicenter (in kilometers) from each recording station and record answers in Table 1. Section 8.1 What Is an Earthquake? 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When an earthquake strikes, P waves arrive at a seismograph rst and S waves next. All rights reserved. Also commonly termed the focus. 0000000856 00000 n Using the real-world data in the living lab enables students and teachers to practice analyzing data to solve problems and answer questions, in much the same way that scientists and engineers do every day. The period of a wave is the time between two adjacent wave peaks. velocity, amplitude, and frequency of the hb```f``Rl@ (l"`+uk?0.a~@6Vm;| G3f`75@v@Wz|A4#w9{(` ) Have students turn in their answers for the Explain portion of the worksheet. The living lab presents earthquake information through a focus on four active seismic areas and historic earthquakes in those areas. Locating the epicenter of an earthquake worksheet answer key, locating the epicenter of an earthquake worksheet pdf, chapter 7 lab 1 locating epicenters answer key, how many seismographs are needed to locate the epicenter of an earthquake. 0000000956 00000 n time for any point that is 3,000 miles /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?? Using historical seismographs, engineers forecast the strength or magnitude of earthquakes and make predictions and determine building codes and safety protocols. Earthquakes occur along faults, which are cracks in the Earths crust that build tension. The USGS Earthquake Hazards Program is part of the National Earthquake Hazards Reduction Program (NEHRP), established by Congress in 1977, and the USGS Advanced National Seismic System (ANSS) was established by Congress as a NEHRP facility. trailer <<320C1F98F8FF4795B5CCB8D9E9A0B99B>]/Prev 812054/XRefStm 1396>> startxref 0 %%EOF 93 0 obj <>stream The arrival of seismic waves will be recognized by an increase in amplitude look for a pattern change as lines get taller and more closely spaced (ex. These distances are determined using a travel-time curve, which is a graph of Pand S-wave arrival times (see Figure 13.11). Take a few minutes to read the information on the left side of this page for the 2010 earthquake off the coast of central Chile. Facility Name Busine Child ren Information Child Name C. Child Social Security Number Type of Case being filed - Check only one category. Sign, fax and printable from PC, iPad, tablet or mobile with pdfFiller Note-taking Worksheet. longer or shorter). (Source: USGS). Analyze and interpret data on natural hazards to forecast future catastrophic events and inform the development of technologies to mitigate their effects. Notify the classroom teacher of technology needs (overhead projector). The three seismograms in this activity are unfi ltered station records from a single event that occurred on August 1, 1999. use slide 6 and answer key slide 7 how can i locate the earthquake epicenter michigan web the epicenter of the earthquake is somewhere on the edge of that circle do the 100 km 4.1 km/s 24.4 s; Finding the epicenter (continued) data table analyze and conclude answer the following questions on a separate sheet of paper. Answer Key: Lab 5 Earthquakes - Find People EARTHQUAKES: Epicenter Determination and Seismic Waves . endstream endobj 84 0 obj <> endobj 85 0 obj <> endobj 86 0 obj <>stream 4. fault - a fracture in Earth's crust where the rocks on either side have moved. Details. Add to Library. The period of P waves is shorter, than the period of surface waves. Thanks for your feedback! Accessibility StatementFor more information contact us [email protected] check out our status page at https://status.libretexts.org. Locating An Earthquake Epicenter Lab Answers Thank you for reading Locating An Earthquake Epicenter Lab Answers . We have answers to the most popular questions from our customers. 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For purposes of this activity, the least complicated and probably most accurate approach is to just use the term "magnitude," without needing to say "on the Richter scale" or "on the moment magnitude scale." The distance is in kilometers. Expert Answer. !5(~q* Thanks for your feedback! How does distance from the epicenter affect the S-P time interval? Focus. Must engineers be content with mitigating disasters, instead of preventing them?