The Quran does not say that mountains make earthquakes impossible. It says that Allah placed firmly set mountains so the earth would not sway with its inhabitants, and it compares mountains to pegs. The objection only works by replacing the Quran's wording with an exaggerated paraphrase.
The Quranic Wording
The Quran uses two related descriptions: rawasi, firmly set mountains, and awtad, pegs or stakes:
And He has placed into the earth firmly set mountains, lest it should sway with you, and [made] rivers and roads, that you may be guided.
Quran 16:15
And We placed within the earth firmly set mountains, lest it should sway with them, and We made therein passes [as] roads that they might be guided.
Quran 21:31
Have We not made the earth a resting place? And the mountains as pegs?
Quran 78:6-7
Similar wording also appears in Quran 31:10. The key phrase is أن تميد بكم, meaning "lest it sway with you" or "so that it does not sway with you". This is not the same as saying, "mountains prevent every earthquake everywhere."
What the Arabic Means
- Rawasi refers to things firmly fixed, settled, or anchored. It is used here for mountains as stable, established features of the earth.
- Awtad is the plural of watad, a peg or stake. The comparison highlights fixation and anchoring; it is not a claim that mountains resemble man-made tent pegs in every physical detail.
- Tamida comes from mayd, meaning swaying, rocking, or unstable movement. When the Quran speaks of violent convulsive shaking, it also uses other roots, such as zalzala in Quran 99:1.
Classical Tafsir and the Correct Claim
Classical tafsir explains these verses as meaning that Allah established mountains so that the earth would not move, sway, or become unstable with its inhabitants. Al-Tabari explains the phrase in that sense, and Ibn Kathir likewise explains it as preventing the earth from trembling, moving, and swaying in a way that would deprive people of settlement. This is a statement about Allah's ordering of the earth for life.
But this tafsir does not mean that no shaking can ever occur. The Quran itself speaks about the earth shaking in other contexts, including the tremendous shaking of the Last Day:
When the earth is shaken with its [final] earthquake.
Quran 99:1
Therefore, the Quran cannot honestly be read as denying all seismic movement. A stabilizing function does not mean the removal of every possible motion.
Does Geology Contradict This?
No. What geology contradicts is the crude claim that "mountains stop all earthquakes." The Quran does not say that.
Modern geology shows that many mountain ranges form through plate collision, uplift, volcanism, and faulting, and some mountain regions are seismically active. Muslims should not claim that mountains are a universal shield against earthquakes or that their presence makes tremors impossible.
At the same time, mountains are not loose decorations sitting on the surface. Major continental mountain ranges are deeply embedded in the crust and are part of the earth's larger lithospheric structure and isostatic balance. In that broad sense, the Quranic language of firmly set mountains and pegs is meaningful: it points to fixation, settlement, and the stable arrangement of the earth without presenting itself as a modern geology textbook.
Why the Objection Fails
- It changes "lest it should sway with you" into "mountains prevent every earthquake."
- It ignores the difference between general habitability and the total absence of movement.
- It overlooks the Quran's own language for convulsive shaking and earthquakes.
- It demands from a concise Quranic sign the style of a technical geology manual.
The sound reading is simple: Allah made the earth suitable for human life, and mountains are among the great structures within that ordered stability. Earthquakes do occur, and the Quran never denies them. The claim that the Quran teaches "mountains stop the earth from ever shaking" is not the Quran's claim, but a misunderstanding imposed upon it.