BERKELEY (KPIX 5) – California’s new earthquake warning app issued its first public alert this week.

The MyShake app was triggered by a magnitude 4.3 earthquake Tuesday that took place between the Central Coast and San Joaquin Valley.

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According to the USGS, the quake happened just before 10:30 a.m. Tuesday and was centered about seven miles south-southeast of Cholame and 22 miles northeast of Paso Robles.

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Cholame quake map

Cholame quake map (CBS)

More than 40 people received the warning.

Tuesday’s earthquake first registered as a magnitude 4.8 before it was downgraded to a 4.3. The threshold for warnings is magnitude 4.5.

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The app, developed by researchers at UC Berkeley, was released in October.