seismic activity earthquake canada symbol heart |
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navigate by keyword : canada heart north america american earthquake seismograph background seismic activity seismometer concept quake disaster frequency energy border continent state aid world help tsunami support damage area rescue ruins region communication donate pray impact richter scale magnitude catastrophe seismology aftershock vibration volcanic detetor monitor collapse apocalypse cataclysm epicenter hypocenter symbol |
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Seismic activity earthquake Canada symbol of heart Richter scale |
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