The hot bubble cooling contraction, caused the rock layers above the dome bubble collapse, cause heat explosion, and outbreak a major earthquake.

热气泡降温收缩，造成热气泡上面的岩石层拱顶坍塌，引发热气爆炸而发生大地震。

youdao

My first impression of the explosion was the very intense flash of light, and a sensation of heat on the parts of my body that were exposed.

我的第一印象是爆炸形成了非常强烈的闪光，身体的暴露部分感到一股热浪袭来。

youdao

A nuclear blast is an explosion with intense light and heat, a damaging pressure wave, and widespread radioactive material that can contaminate the air, water, and ground surfaces for miles around.

核爆炸会释放出高能量的光和热，破坏力巨大的压力波，而且四处飘散的放射性物质会污染数周围英里内的空气，水，和地表。

youdao

Many have cuts and broken bones from falling debris and burns from the intense heat of the explosion.

VOA: standard.2010.07.26

Theorists believe the rapid collapse generates heat that ignites the explosion.

CNN: Why gamma-ray burst shocked scientists

An explosion is simply an exponential rise in heat.

FORBES: Digital Rules

Furthermore, it would take a combination of extreme events to make things dangerous in Tokyo (nuclear re-criticality, steam explosion) etc all of which are being rendered less and less likely as time passes and the heat decay process progresses.

FORBES: Fukushima Cleanup Recap