Activity 4: Locating an Earthquake Epicenter Examining Seismograms
Activity 4: Locating an Earthquake Epicenter Examining Seismograms
Activity 4: Locating an Earthquake Epicenter Examining Seismograms
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Usingatraveltimegraph1. Use Figure 2 to determine the difference in arrival times (inminutes) between the first P‐wave <strong>an</strong>d first S‐wave for stationsthatarethefollowingdist<strong>an</strong>cesfrom<strong>an</strong>epicenter. 700miles:__________________minutesdifference 450miles:__________________minutesdifference 2500miles:__________________minutesdifference2. FromtheseismograminFigure1,thedifferencesinarrivaltimesbetween the first P‐wave <strong>an</strong>d the first S‐waves equal (3, 7, 10)minutes.Circleyour<strong>an</strong>swer:3. Refer to the travel‐time graph. What is the dist<strong>an</strong>ce from theepicentertothestationthatrecordedtheearthquakeinFigure1? _____________miles
TravelTimeGraph(Figure2)
Directions:Figure3illustratesseismogramsfromthesameearthquakerecordedatLosAngeles,CA,St.Louis,MO<strong>an</strong>dHouston,TX.Usethisinformationto<strong>an</strong>swerthefollowingquestions.1. Usethetravel‐timegraph,Figure2,todeterminethedist<strong>an</strong>cethateachstationinFigure3isfromtheepicenter.Writeyour<strong>an</strong>swersintheepicenterdatatable,Table1.2. Afteryouhavedeterminedthedist<strong>an</strong>cethateachstationisfromtheepicenter,usethedrawingcompassprovidedtodrawacirclearoundeachofthethreestationswitharadius,inmiles,equaltoitsdist<strong>an</strong>cefromtheepicenter.UsethemapoftheUnitedStates.(Note:Usethedist<strong>an</strong>cescaleprovidedonthemaptosetthedist<strong>an</strong>ceonthedrawingcompassforeachstation.)
Figure3.
Determining<strong>an</strong><strong>Earthquake</strong><strong>Epicenter</strong>1. Didallthreeofthecirclesdrawnwiththecompassoverlapinonespot?2. Thisearthquakeoccurredclosesttowhichcity,inwhichstate?3. Thisearthquakeoccurredinawell‐knownseismiczone.Whatisthenameofthisseismiczone?4. Tothebestyouofyourability,useapencil,orcoloredpenciltodraw the approximate location of the seismic zone named inquestion3.Besuretolabeltheseismiczoneonthemap.Brainstorming:Assume that the same earthquake occurred, but the seismic station inLos Angeles malfunctioned, <strong>an</strong>d did not record the earthquake. Withonly the information from seismic stations in St. Louis <strong>an</strong>d Houston,brainstorm how a geologist might determine the location of theearthquakeepicenter?
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