How to Say "fault line" in Spanish
The Spanish word for “fault line” is “falla” — B2 level.
English → SpanishB2
nounB2formal
geological break in the earth's crust

Examples
Los sismólogos estudian la falla de San Andrés.
Seismologists are studying the San Andreas Fault.
La actividad sísmica es mayor cerca de las fallas activas.
Seismic activity is higher near active fault lines.
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