3.48, 2 km E of Fullerton, CA

3.48, 2 km E of Fullerton, CA

Disclaimer: This information is intended solely for research and should not be used for communications with the media or the public.

Table Of Contents

Mainshock Details

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Information and plots in the section are taken from the USGS event page, accessed through ComCat.

FieldValue
Magnitude3.48 (mlr)
Time (UTC)Tue, 5 Dec 2023 04:09:58 UTC
Time (UTC)Tue, 5 Dec 2023 04:09:58 UTC
Location33.876, -117.90417
Depth10.65 km
Statusreviewed

USGS Products

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ShakeMap
Did You Feel It?
ShakeMapDYFI

Nearby Faults

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9 UCERF3 fault sections are within 10km of this event's hypocenter:

  • Elysian Park (Lower CFM): 2.39km
  • Yorba Linda: 2.45km
  • Compton: 3.81km
  • Peralta Hills: 4.35km
  • Puente Hills (Coyote Hills): 7.08km
  • Richfield: 7.28km
  • Anaheim: 7.69km
  • Puente Hills: 8.07km
  • Whittier alt 2: 9.77km

Sequence Details

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These plots show the aftershock sequence, using data sourced from ComCat. They were last updated at 2023/12/05 15:40:41 UTC, 11.51 hours after the mainshock.

2 M≥0 earthquakes within 10 km of the mainshock's epicenter.

First HourTo Date
M 012
M 112
M 211

Magnitude Vs. Time Plot

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This plot shows the magnitude vs. time evolution of the sequence. The mainshock is ploted as a brown circle, and aftershocks are plotted as cyan circles.

Mag vs Time Plot

Aftershock Locations

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Map view of the aftershock sequence, plotted as cyan circles. The mainshock is plotted below as a brown circle, but may be obscured by aftershocks. Nearby UCERF3 fault traces are plotted in gray lines, and the region used to fetch aftershock data in a dashed dark gray line.

First Day

Cumulative Number Plot

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This plot shows the cumulative number of M≥0 aftershocks as a function of time since the mainshock.

Time Func

Magnitude-Number Distributions (MNDs)

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These plot shows the magnitude-number distribution of the aftershock sequence thus far. The left plot gives an incremental distribution (the count in each magnitude bin), and the right plot a cumulative distribution (the count in or above each magnitude bin).

Incremental MNDCumulative MND
IncrementalCumulative

Pre Event Seismicity Results

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Figure 1. Seismicity Map
Map view of earthquakes (circles) with magnitude M2.0+ that occurred within 3 months and within 5 rupture lengths from the event considered (star). Circle size is proportional to magnitude (see legend) and color represents the time prior to the event considered (see colorbar).

Figure 2. Magnitude (with b-value estimation) vs. Time
Magnitude (left axis) and b-value (right axis) vs. time of earthquakes in the seismicity map prior to the event considered (star). Color represents distance to the event (see colorbar). The b-value (gray line) is estimated within a sliding window of 20 days; results are only reported for windows with >5 events. The gray dashed lines correspond to a 95% CI for the b-value. The b-value estimation and confidence intervals are according to Tinti and Mulargia (1987).

Figure 3. Distance vs. Time
Distance (left axis) vs. time of earthquakes in the seismicity map prior to the event considered (star). Color represents hypocentral depth (see colorbar). The gray line shows distance to event considered averaged within sliding time window of 20 events.

Figure 4. (Depth vs. Time)
Hypocentral depth (left axis) vs. time of earthquakes in the seismicity map prior to the event considered (star). Color represents distance to the event considered (see colorbar). The gray line shows the depth averaged within sliding time window of 20 events.