The April 4 magnitude-4.4 quake struck near Tres Pinos, Calif., in the Calaveras Fault Zone. Preliminarily, it looks like the earthquake may have struck on the Tres Pinos Fault, just east of the Calaveras Fault.

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The April 4 magnitude-4.4 quake struck near Tres Pinos, Calif., in the Calaveras Fault Zone. Preliminarily, it looks like the earthquake may have struck on the Tres Pinos Fault, just east of the Calaveras Fault.

The April 4 magnitude-4.4 quake struck near Tres Pinos, Calif., in the Calaveras Fault Zone. Preliminarily, it looks like the earthquake may have struck on the Tres Pinos Fault, just east of the Calaveras Fault.

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