M2.2 earthquake 9 km NW of Parkfield, California

A magnitude 2.2 earthquake struck 9 km NW of Parkfield, California on Sun, Apr 28, 2002, 8:03 PM PDT (03:03 UTC), 5 km (3 mi) below the surface.

Automatic solution: the magnitude and location may still be revised.

A larger quake followed: M3.8 22 km NE of Soledad, California. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
2.19	Md, duration	Northern California Seismic System	Preferred · Preliminary · ±0.12 · 25 stations
1.91	ML, local (Richter)	Southern California Seismic Network	Reviewed · ±0.304 · 2 stations

No one has reported feeling this quake to the USGS.

An automatic solution; a seismologist may revise it.

Distance and direction from each place to the epicenter, with its forecast.

Within 100 km, magnitude 1.5 and up: 147 in the 60 days after this one and 49 in the 30 days before it.

The first 60 of 147.

From the USGS Earthquake Hazards Program and its partner networks, event nc30505413 (also filed as ci12883724). Read Mon, Oct 5, 2026, 7:01 AM UTC.