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The feat

In the Last Jedi novelization by Jason Fry, there is a feat where Old Man Luke causes his adorable little island to quake with his Force power. The novel states that the mountain “shuddered” and shed chunks of debris. In this thread, WeeklyBattles stated that such a quake would have to be of Magnitude 6 to 6.9 on the Richter scale.

The calc

I will be using this calculator to estimate the power of that quake.

Assuming Magnitude 6.0:

= 6.309573e+13 J = 15.08 Kilotons = 7-C (Town level)

Assuming Magnitude 6.1:

= 8.912509e+13 J = 21.03 Kilotons = 7-C (Town level)

Assuming Magnitude 6.2:

= 1.258925e+14 J = 30.09 Kilotons = 7-C (Town level)

Assuming Magnitude 6.3:

= 1.778279e+14 J = 42.50 Kilotons = 7-C (Town level)

Assuming Magnitude 6.4:

= 2.511886e+14 J = 60.03 Kilotons = 7-C (Town level+)

Assuming Magnitude 6.5:

= 3.548134e+14 J = 84.80 Kilotons = 7-C (Town level+)

Assuming Magnitude 6.6:

= 5.011872e+14 J = 119.78 Kilotons = 7-C (Large Town level)

Assuming Magnitude 6.7:

= 7.079458e+14 J = 169.20 Kilotons = 7-C (Large Town level)

Assuming Magnitude 6.8:

= 1.000000e+15 J = 239.00 Kilotons = 7-C (Large Town level)

Assuming Magnitude 6.9:

= 1.412538e+15 J = 337.60 Kilotons = 7-C (Large Town level)

Final Tally

Luke Skywalker quakes an island:

= 15.08 to 337.60 Kilotons = 7-C to High 7-C (Town to Large Town level)

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