Updated 2026-09-02 23:12:21 UTC

M 2.3 — 5 km SSW of Alameda, CA

Magnitude 2.3, depth 16.5 km, 2026-08-21 11:38:49 UTC.

MagnitudeM 2.3
Depth16.5 km
Felt reports8
Statusreviewed
TsunamiNo
Quake Pulse Activity Index

Activity trend

A high index means recent activity is high relative to the selected historical baseline. It does not mean that a larger earthquake is about to occur.

Quake Pulse Activity Index84/100Elevated
Current 30 days18
Historical monthly median11.0
Historical percentileP84
M5+ in 30 days6
M6+ in 30 days0
Activity trendabove the historical median (+64%)
Baseline months: 60Last calculation: 2026-09-03 06:17:39How the index works →
Quake Pulse

What to know

A short factual reading of this event from the available observations.

  • Magnitude M 2.3 at 16.5 km depth.
  • 8 felt report(s) are associated with the USGS record.
  • The solution has already been revised 3 times in Quake Pulse.
Counts describe detected earthquakes and are not a forecast or hazard assessment.
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Within the Quake Pulse database

Long-term comparisons are more robust at higher magnitudes because small-earthquake detection capability has changed over time.

Magnitude rank in database#190,994
Magnitude rank in country#7,338
M4.5+ within 250 km, ±15 days0
Quake Pulse

Impact and context

Descriptive indicators available for this event and its surroundings.

6/100Limited context
Felt reports8
Max felt intensity (CDI)2.2
Instrumental intensity (MMI)—
PAGER alertNot available
Tsunami indicator—
USGS significance82
Depth contextShallow
Nearby major citySan Francisco15 km · 808,000

Nearby major city

Displayed population is the indexed city population, not an estimate of people exposed.

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These indicators describe data available after detection. They are neither a forecast nor a direct estimate of damage or individual risk.

Quake Pulse

Around this epicenter

Nearby events observed around this epicenter. Spatial proximity does not necessarily mean they belong to the same sequence.

M 2.3 · 5 km SSW of Alameda, CA · 100 kmInteractive 3D view of earthquakes within 100 km of M 2.3 · 5 km SSW of Alameda, CA.M 2.3 · 5 km SSW of Alameda, CAM 1.2 · 2 km SE of Pacifica, CA · 22.8 kmM 2.1 · 2 km NE of Pacifica, CA · 21.8 kmM 1.1 · 3 km W of Dublin, CA · 25.4 kmM 1.1 · 4 km WNW of Dublin, CA · 24.6 kmM 2.5 · 10 km ENE of Milpitas, CA · 49.4 kmM 1.2 · 5 km NNW of Morgan Hill, CA · 80.3 kmM 1.8 · 7 km W of Saint Helena, CA · 89.3 kmM 1.8 · 8 km W of Saint Helena, CA · 89.5 kmM 1.2 · 18 km E of Alum Rock, CA · 67.0 kmM 1.8 · 4 km NNE of Pacifica, CA · 21.0 kmM 2.6 · 21 km E of Alum Rock, CA · 72.7 kmM 2.0 · 3 km W of Dublin, CA · 25.7 kmM 1.5 · 2 km N of Berkeley, CA · 18.4 kmM 2.2 · 3 km W of Dublin, CA · 25.7 kmM 1.6 · 3 km W of Dublin, CA · 25.5 kmM 1.9 · 4 km ESE of Santa Rosa, CA · 86.7 kmM 1.6 · 4 km ESE of Santa Rosa, CA · 87.1 kmM 2.7 · 3 km ESE of Santa Rosa, CA · 86.7 kmM 1.9 · 6 km SW of Antioch, CA · 44.3 kmM 2.4 · 3 km WNW of Dublin, CA · 25.9 kmM 1.5 · 4 km NNE of Crockett, CA · 40.1 kmM 3.0 · 9 km SW of Brentwood, CA · 42.8 kmM 1.5 · 10 km ENE of Blackhawk, CA · 42.1 kmM 1.4 · 1 km ENE of Woodside, CA · 32.5 kmM 1.7 · 1 km ENE of Woodside, CA · 32.3 kmM 2.0 · 1 km E of Woodside, CA · 32.6 kmM 2.5 · 1 km E of Woodside, CA · 32.8 kmM 1.4 · 10 km NE of San Martin, CA · 90.1 kmM 2.6 · 9 km SW of Brentwood, CA · 43.3 kmM 1.4 · 15 km E of Seven Trees, CA · 70.6 kmM 1.5 · 14 km SSE of Livermore, CA · 52.0 kmM 0.8 · 4 km E of Berkeley, CA · 16.5 kmM 1.6 · 16 km E of Seven Trees, CA · 71.6 kmM 1.0 · 7 km ESE of St. Helena, CA · 83.8 kmM 1.3 · 6 km SSE of Portola Valley, CA · 44.0 kmM 1.4 · 3 km N of Piedmont, CA · 14.5 kmM 1.2 · 1 km SE of Oakland, CA · 7.9 kmM 0.9 · 2 km ENE of Berkeley, CA · 17.1 kmM 3.4 · 9 km SW of Brentwood, CA · 43.5 kmM 1.5 · 3 km W of Dublin, CA · 25.8 kmM 1.5 · 7 km E of Santa Venetia, CA · 33.6 kmM 1.4 · 3 km W of Dublin, CA · 25.5 kmM 1.1 · 3 km W of Dublin, CA · 25.5 kmM 1.8 · 3 km W of Dublin, CA · 25.2 kmM 1.6 · 8 km WSW of Mountain House, CA · 55.6 kmM 1.0 · 20 km NE of Morgan Hill, CA · 87.1 kmM 1.5 · 3 km W of Dublin, CA · 25.2 kmM 2.2 · 3 km WNW of Dublin, CA · 25.6 kmM 2.1 · 3 km WNW of Dublin, CA · 26.0 kmM 1.2 · 4 km W of Dublin, CA · 25.0 kmM 2.1 · 3 km W of Dublin, CA · 25.7 kmM 1.6 · 3 km ESE of Hayward, CA · 21.2 kmM 1.1 · 1 km SW of Diablo, CA · 28.3 kmM 2.5 · 2 km ESE of Oakland, CA · 8.1 kmM 1.2 · 4 km WNW of San Francisco Zoo, CA · 25.1 kmM 2.0 · 8 km NE of Alum Rock, CA · 56.4 kmM 0.8 · 17 km E of Alum Rock, CA · 69.4 kmM 1.6 · 14 km N of Morgan Hill, CA · 75.3 kmM 1.3 · 3 km ENE of Saratoga, CA · 55.8 kmM 2.1 · 8 km ENE of Vallejo, CA · 46.2 kmM 1.6 · 6 km N of Alum Rock, CA · 51.1 kmM 1.9 · 1 km SW of Diablo, CA · 28.3 kmM 1.8 · 5 km SE of Fairview, CA · 23.5 kmM 1.3 · 15 km SW of Loyola, CA · 53.3 kmM 1.6 · 0 km S of Angwin, CA · 95.7 kmM 1.0 · 1 km E of Pacheco, CA · 33.5 kmM 1.5 · 4 km S of Pittsburg, CA · 44.1 kmM 1.6 · 12 km NE of Napa, CA · 71.4 kmM 1.6 · 4 km ESE of Roseland, CA · 85.1 kmM 1.7 · 4 km SW of Brentwood, CA · 48.9 kmM 1.7 · 5 km NNW of Green Valley, CA · 64.2 kmM 1.7 · 15 km E of Seven Trees, CA · 70.6 kmM 1.1 · 7 km NW of American Canyon, CA · 55.7 kmM 1.7 · 9 km WSW of Patterson, CA · 95.4 kmM 3.3 · 3 km ESE of Larkfield-Wikiup, CA · 95.2 kmM 1.4 · 4 km SE of Calistoga, CA · 95.1 kmM 1.4 · 15 km N of Morgan Hill, CA · 75.2 kmM 1.3 · 3 km WNW of Orinda, CA · 18.7 kmM 1.6 · 4 km ESE of Hayward, CA · 22.1 kmM 1.5 · 5 km E of Fremont, CA · 36.2 kmM 1.2 · 1 km SSE of Blackhawk, CA · 32.6 kmM 1.8 · 8 km E of Vallejo, CA · 45.7 kmM 1.1 · 3 km ESE of Pacifica, CA · 22.1 kmM 1.6 · 2 km ESE of Pacifica, CA · 22.3 kmM 2.1 · 2 km SE of Pacifica, CA · 23.2 kmM 1.1 · 2 km SSE of Green Valley, CA · 57.9 kmM 2.3 · 3 km NNE of Graton, CA · 97.0 kmM 1.7 · 11 km ESE of Angwin, CA · 91.5 kmM 1.4 · 7 km ESE of Santa Rosa, CA · 84.7 kmM 1.8 · 7 km ESE of Santa Rosa, CA · 84.9 kmM 1.8 · 1 km SE of Pacifica, CA · 23.2 kmM 1.4 · 7 km E of Santa Venetia, CA · 33.7 kmM 1.9 · 7 km NNE of Benicia, CA · 44.4 kmM 1.0 · 2 km W of Hercules, CA · 32.9 kmM 1.4 · 4 km NNE of San Leandro, CA · 10.8 kmM 1.6 · 11 km SSE of Sunol, CA · 44.9 kmM 1.2 · 1 km NNE of Pacheco, CA · 33.7 kmM 2.3 · 1 km SE of Pacifica, CA · 23.5 kmM 2.0 · 2 km NW of Lafayette, CA · 21.9 kmM 1.4 · 2 km W of San Ramon, CA · 23.8 km
M 2.3 · 5 km SSW of Alameda, CA100 km100 Recent earthquakes

Descriptive map centered on the epicenter; it does not represent felt intensity or risk.

Sequence context

No public sequence is currently associated with this event.

Nearby events · 100 km

Quake Pulse

USGS data evolution

Earthquake parameters can be revised after first publication. This timeline shows versions retained by Quake Pulse.

Revisions3
Magnitude change0.0M 2.3 → M 2.3
Depth change-1.7 km
Last update54004 min
2026-08-22 04:44:41 UTC2026-09-02 23:12:21 UTC

Revision history

Observed changes stored by Quake Pulse.

Mise à jourMagnitudeDepthStatus
2026-08-22 04:44:41 UTC2.3318.170000076294 kmautomatic
2026-09-02 22:32:21 UTC2.2916.49 kmreviewed
2026-09-02 23:12:21 UTC2.2916.49 kmreviewed

Explore related context

Putting this earthquake in context

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Interpret the numbers

Magnitude, depth, felt reports and status describe different parts of the event. None of them alone predicts the consequences for a specific city.

Important limits

If the earthquake creates a safety concern, follow local authorities and official warning channels rather than relying on a public data website.

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