Let's see if I get this math right.

Mauna Loa is about 95,000 km3 in volume says https://www.usgs.gov/volcanoes/mauna-kea/science/geology-and... . Density of TNT is 1.6g/cm3:

  95000 km3 * (1000m/km)**3 * 1600 kg/m3 = ~1.5E17 = 150 pt.

Nope, I can't conceive of that much energy.