Douglas Harper's Etymology Dictionary
tremblor
"earthquake," 1913, alteration of temblor, by influence of trembler, agent noun of tremble (v.).
Wiktionary
tremblor
n. An earthquake.
Usage examples of "tremblor".
After the terrifying tremblor that had just shaken Gemworld, these particular inhabitants looked angrier than ever.
With each successive tremblor, more stones toppled from the towers and walls, some of them crashing downhill toward the River Sarron, but most into the city.
As if to emphasize the point a small tremblor shook the ground, vibrating the soles of their boots.
Beltar shifted his weight silently, and another set of tremblors raced through the ground toward Sarron.
The perimeter security includes tremblors (groundvibration sensors), infrared body-heat detectors, and armed guards from the Special Forces.