A 3.7 magnitude earthquake shook St. Thomas and St. John at about 5:30 Monday morning. The Puerto Rico Seismic Network estimated the center was about 25 miles north-northwest of the bigger island, the St. John Source reported. The acting director of the Territorial Emergency Management Authority reminded residents the VI’s are in the same seismic zone as California. "We need to be quite aware of our surroundings," Steve Parris told the Source. He added that the last "bad earthquake" was in 1867.