Magnitude 5.5 near Portola, CA
|Information from UCB, USGS Menlo Park, & UNR
||14 km (9 miles) W of Portola, CA
|Date & Time (Local):
|Date & Time (UTC):
This area of California averages a M5 or larger earthquake approximately
every 20 years or so. According to Tousson Toppozada of the California
Division of Mines and Geology, historical events in this area include:
1875 M 6.2, ~40 km to the NNE near Janesville
1888 M 6.2, ~20 km to the SSW near Blairsden
1959 M 5.6, ~40 km to the ESE near Verdi
1966 M 6.0, ~60 km to the SSE near Truckee
- Seismogram from ORV BHZ via "Make Your Own Seismogram"
The BSL station
is located ~80 km away from the epicenter of this earthquake. An aftershock at 1:36 PM local time (20:36 UTC)
is visible as a low amplitude wiggle on this plot. You can see what is
happening at ORV now by checking the
- 3-component recording from ORV
This figure shows the 3 components of ground motion recorded at ORV, and
indicates the arrival times of the P and S waves.
- BDSN recordings
This figure shows the recordings from several BDSN stations.
- "Helicorder Cam"
From UNR, showing the seismic signal coming in from their station at Battle Mountain,
Nevada. (Check the archives if the event is no longer visible.)
- Ground shaking information
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