1. A sufficiently large earthquake magnitude and other information triggers a tsunami warning. 2. Earthquake magnitudes are calculated according to ground motion recorded on seismographs.3. There is no direct connection between an earthquake magnitude and a resulting tsunami. 4. Earthquake magnitudes are measures of earthquake size calculated from ground motion recorded on seismographs.5. The scales of earthquake magnitude , which measure earthquake size calculated from ground motion recorded on seismographs: 6. The size obviously dictates the potential earthquake magnitude . 7. Allbaugh said preliminary assessments suggested damage was light, though the earthquake magnitude was " pretty serious ." 8. The earthquake magnitude 7.5 hit the Pichilemu, O'Higgins Region area on April 8, causing two more deaths. 9. The maximum creditable earthquake magnitudes are 8.25 for the San Andreas fault and 6.75 for the Healdsburg fault. 10. The scale came about in 1969 _ 34 years after seismologist Charles Richter invented the earthquake magnitude scale.
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