妙法蓮華經玄義 6.112

6.112

阿浮陀達摩者，如佛現種種神力，眾生怪未曾有。放光動地，種種異相，皆名阿浮陀達摩也。

As for *adbhutadharma*, it is when the Buddha displays various supernormal powers, and sentient beings marvel at them as unprecedented. Emitting light, shaking the earth, and various extraordinary signs are all named *adbhutadharma*.