Historical Swarm Analysis
Compare earthquake swarms across years • Click any swarm to drill down
Swarm Episodes
0
multi-week events
M3+ Quakes
0
felt by many
Largest Episode
—
earthquakes
Longest Episode
—
duration
Peak Magnitude
—
in episodes
Swarm Episodes by Year
Episodes are multi-week periods of sustained seismic activity • Click to see daily breakdown
15 Years of Data
Total Earthquakes44,734
Swarm Events Detected50
Largest RecordedM5.5
Data Range2010 – Present
Regional Comparison
How does earthquake activity compare across Northern California regions?
Santa Clara / San Jose / Morgan Hill18,168
Gilroy / Hollister / South Valley9,908
SF Peninsula / Millbrae / Pacifica5,017
Berkeley / Oakland / Piedmont4,256