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WhereDoEarthquakesandVolcanoesOccur?QuickWrite:Describeanexperiencethatyoumayhavehadwithanearthquakeorvolcaniceruption.____________________________________________________________________________________________________________________________________________________________Think-Pair-Share:WhatcontrolsthelocationofearthquakesandvolcanoesonEarth?Arethelocationsofvolcanoesandearthquakesrelatedtooneanother?____________________________________________________________________________________________________________________________________________________________Inthisactivity,youwillexamineadatasetwiththelocationsofmajorearthquakesandactivevolcanoesaroundtheEarth.Directions:1. Youwillworkinagroupoffour.2. Onthefollowingpages,therearefourlists:twolistsofactivevolcanoesandtwolistsofmajor

earthquakes.Eachstudentshouldchooseonelistofvolcanoesorearthquakestoplotonthemap.Inyourgroup,allofthevolcanoesandearthquakeswillbeplotted

3. Useapencilandrulertolocateeachofthevolcanoesorearthquakesonyourlistontheworldmapusingthelatitudeandlongitude.

4. Onyourmap,indicatewhichlistyouareplotting.5. Whenyouaresatisfiedthatyouhavecorrectlylocatedthepositiononthemap,useacolored

penciltomarkthelocationwithadot.6. Writethenumberoftheearthquakeorvolcanoonthemapnexttothedot.7. Whenallofthelocationshavebeencompletedinyourgroup,examinetheotherstudents’maps

anddiscussthefollowingquestionswithinyourgroupandrecordyouranswers.

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Questions1. AreearthquakesandvolcanoesevenlydistributedoraretheyunevenlydistributedontheEarth’s

surface?

2. Arethelocationsofearthquakesandvolcanoesrelatedtooneanother?Arethereexceptions?

3. WherearemostoftheearthquakesandvolcanoeslocatedonEarth?

4. Examinetheplatetectonicmaponthelastpageandcomparethelocationsofearthquakesand

volcanoeswiththetectonicplates.DescribetherelationshipbetweenthelocationsofearthquakesandvolcanoeswiththetectonicplatesthatformtheEarth’scrust.

5.Proposeareasonwhythelocationsofearthquakesandvolcanoesarerelatedtotectonic

plates.

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Currentlythereareover1500activevolcanoesintheworld.Anactivevolcanoisonethathaseruptedatleastonceinthepast10,000yearsandislikelytoeruptagain.Thetablesbelowprovidethepositionbylatitudeandlongitudefor20activevolcanoes.

VolcanoList1 Name Latitude Longitude1 Azul 36°S 71°W2 Bezymianny 56°N 161°E3 CerroNegro 13°N 87°W4 Cotopaxi 1°S 78°W5 Katmai 58°N 155°W6 Kilauea 19°N 155°W7 Krakatoa 6°S 105°E8 Ksudach 52°N 158°E9 Mt.Lassen 40°N 122°W10 Mt.Fuji 35°N 139°E

VolcanoList2

Name Latitude Longitude11 Mt.Pelee 15°N 61°W12 Mt.Rainier 47°N 122°W13 Mt.St.Helens 46°N 122°W14 Paricutin 20°N 102°W15 Pinatubo 15°N 120°E16 Surtsey 63°N 20°W17 Tambora 10°S 120°E18 Lauca 18°S 69°W19 Adagdak 52°N 176°W20 NevadadelRuiz 5°N 75°W

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Thefrequencyofmajorearthquakesdependsuponthemagnitude.Thelargerthemagnitude,thelessfrequentlytheyoccur.Onaverage,~150earthquakeswithamagnitudegreaterthan6.0occurannuallyintheworld.Thetablesbelowprovidethepositionbylatitudeandlongitudefor20majorearthquakes.

EarthquakeList1 Location Magnitude Latitude Longitude1 Valdivia 9.5 40°S 73°W2 PrinceWilliamSound 9.2 61°N 147°W3 Sumatra 9.2 3°N 96°E4 Tohoku 9.0 38°N 142°E5 Kamchatka 9.0 53°N 161°E6 Arica 9.0 18°S 71°W7 Cascadia 9.0 45°N 125°W8 Arakan 8.8 22°N 92°E9 Ecuador-Colombia 8.8 1°N 81°W10 Maule 8.8 36°S 73°W

EarthquakeList2

Location Magnitude Latitude Longitude11 Assan 8.7 28°N 96°E12 RatIslands 8.7 51°N 179°E13 Kuril 8.5 45°N 150°E14 Erzincan 7.8 40°N 40°E15 Celebes 8.3 5°N 123°E16 LoMustang 8.2 29°N 83°E17 FortTejon 7.9 36°N 120°W18 MexicoCity 8.0 18°N 103°W19 VancouverIsland 6.6 49°N 129°W20 Sandpoint 8.3 55°N 158°W

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TheEarth’scrustiscomposedofrigidplatesthatmaymoverelativetooneanotherontheEarth’ssurface.ThemapshowsthemajortectonicplatestheformtheEarth’scrust.Notethatatectonicplatemaycontainbothportionsofacontinentandseafloor.Theblacklinesbetweentheplatesrepresentthemarginsbetweentheplates.

USGS