File photo. A seismograph machine needle drawing a line depicting seismic and earthquake activity.
A preliminary 3.6 magnitude tremor struck Stanislaus County and southeast of Tracy Wednesday evening, according to the United States Geological Survey.
The quake hit at around 5:59 p.m. and was centered about 9.6 miles west southwest of Patterson and 21.7 miles southwest of Modesto.
No other information was immediately available.
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