That description you offered sounds to me a lot like an earth quake<quoted text>
Quran NEVER said that Allah created mountains to control earth quakes!! There is no mention of Earth Quakes (ZILZAL in Arabic) when Mountains are discussed.
Quran says that Allah fixed mountains on earth, so it does not shake and remain "fluid" due to constant motion. This slight shaking all the time is different from Earth Quakes.
If it was a mistake it is forgivable, but if it was deliberate attempt to malign Quran and mislead people then it is devilish!!
My guess is that there are no mention of earthquakes with mountains in the Quran because they lacked the science. Seismology was founded by the Portugese and refined by Chinese.