A seven-point-oh quake with aftershocks as strong as 5.8? That's major! Prayers for everyone in Alaska.
1964 it was 9.2 (20+ times greater) ... which makes a 7.x look like child’s play. Pretty much in the same area
“Because of the logarithmic basis of the scale, each whole number increase in magnitude represents a tenfold increase in measured amplitude; as an estimate of energy, each whole number step in the magnitude scale corresponds to the release of about 31 times more energy than the amount associated with the preceding whole number value”
7.0 = “Causes damage to most buildings, some to partially or completely collapse or receive severe damage. Well-designed structures are likely to receive damage. Felt across great distances with major damage mostly limited to 250 km from epicenter.”
9.x = “At or near total destruction - severe damage or collapse to all buildings. Heavy damage and shaking extends to distant locations. Permanent changes in ground topography.”