Because "tremblor" isn't a word. You might be thinking of "trembler". "Trembling" is "tremblor" in Spanish. We use the Spanish word as a technical word for earthquakes.
I'm adding a "duh" correction. This answer doesn't make sense. What should have been said is "trembling is TEMBLOR in spanish. Otherwise this is meaningless
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Seismic activity or seismic event. They may also be known as a tremor or temblor (which is derived from the Spanish "to shake").
A 2.2 temblor was recorded with an epicenter 8 miles ESE of San Luis Obispo on February 7, 2012. See related link below for map:
The origin of an earthquake is called the epicenter.
earthquake aftershocks
The study of earthquakes is called seismology so an earthquake expert should be called a seismologist.