Magnitude 5.5 near Portola, CA
Friday, August 10, 2001 at 1:19:26 PM (PDT)

Preliminary Earthquake Report

Information about the earthquake and its location

Map showing location of the earthquake and nearby earthquakes
Updated hourly for six days after the earthquake. Includes this event and (up to) the first 6 days of aftershocks, if any.

Shake Map
Preliminary map of shaking intensity based on measurements by seismic networks. Usually available within 5 minutes after the earthquake.

Did You Feel It?
Report shaking and damage at your location. You can also view a map displaying accumulated data from your report and others.

Aftershock Forecast

UC Berkeley moment tensor solution

Topographic Map for this Area
There will be a red X at the earthquake epicenter.
(Note: Takes you off this site.)

California Office of Emergency Services
(Note: Takes you off this site.)

As additional information becomes available, it will be posted here.

Version #2: This report supersedes any earlier reports of this event.

Seismological Laboratory, University of Nevada, Reno