A new map released by the U.S. Geological Survey depicts Bay Area earthquake activity over the last 30 years as well as major faults in the area. The map, Earthquakes and Faults in the San Francisco Bay Area, depicts more than 62,750 earthquakes that occurred over the last 30 years as well as the San Andreas, Hayward and Calaveras faults. The map shows 22 quakes with magnitude 5.0 and greater and has an accompanying table that lists the time, date, depth and coordinate location of each quake.
The large-format map was created using several types of geospatial data from a variety of sources including seismic records and the survey’s fault database. “This map is intended to increase public awareness of hazards associated with Bay Area earthquakes,” said U.S. Geological Survey geographer Ben Sleeter. The survey reports that earthquakes are a significant hazard in the Bay Area and to 75 million Americans in 39 states.