M2.6 earthquake 2km E of Pasadena, CA

A magnitude 2.6 earthquake struck 2km E of Pasadena, CA on Wed, Jun 18, 2003, 1:26 PM PDT (20:26 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M3.0 32km W of Avalon, CA. 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
2.56	ML, local (Richter)	Southern California Seismic Network	Preferred · Final · ±0.24 · 152 stations
2.6	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

The USGS’s account of the effects of this earthquake.

Felt (III) at Pasadena. Also felt at Alhambra, Altadena, Arcadia, Glendale, San Gabriel, San Marino, Sierra Madre, South Pasadena and Temple City.

From the USGS event page for ci9923837. U.S. Geological Survey text and figures are in the public domain.

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

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

Within 100 km, magnitude 1.5 and up: 128 in the 60 days after this one and 57 in the 30 days before it.

The first 60 of 128.

From the USGS Earthquake Hazards Program and its partner networks, event ci9923837 (also filed as usp000c06f). Read Mon, Oct 5, 2026, 12:05 PM UTC.