tremble

The ground trembled so violently some people thought there was an earthquake.

The retired aerospace engineer, who lives in Sierra Madre, did about four reps before his teeth clenched, his legs trembled and he let out short puffs of air through pursed lips.

Describing this as a "peace through strength approach", he added: "Putin should respect our strength, not have the free world tremble at his threats."

Again and again, as my forearms trembled and my fingers ached, my feet slipped on the mercilessly smooth granite.

In the Los Feliz-East Hollywood area, one person felt two waves of shaking — an initial wave, followed by an easing of shaking, then walls starting to tremble.