A light, 4.7-magnitude earthquake struck in Northern California on Wednesday, according to the United States Geological Survey. The temblor happened at 6:34 p.m. Pacific time about 2 miles northwest of Cobb, Calif., or about 70 miles north of San Francisco, data from the agency shows.

Some sections of Northern California's coast are considered vulnerable to tsunamis. Here's where those locations are and how to best prepare.

Mapping Tsunami Risk in Northern California: Areas at Highest Risk for Flooding