Which active faults threaten San Francisco?

The fault systems associated with San Francisco are named in the hub header and drawn on the map alongside recorded seismicity. Proximity alone does not rank hazard: rupture length, slip rate and the time elapsed since the last event all matter, so the page shows the traces and the observed activity rather than a single ranking.

Who is the emergency service for San Francisco?

The civil protection agency responsible for San Francisco, with its emergency number, is shown on this page. Call it for any life-threatening situation; for official damage reports and aftershock bulletins, follow the national seismological agency listed among our data sources.

Photo:Bailey Zindelvia Unsplash

Back to Regions List UNITED STATES

San Francisco

The 1906 rupture of the San Andreas ran the length of the peninsula, while the parallel Hayward Fault beneath the densely built East Bay has an average recurrence near 150 years and last broke in 1868.

Danger Level (72h)

72-hour composite hazard forecast

Recent Quakes (14d)

Recorded in the selected 14d period

Max Magnitude (14d)

Largest earthquake in the selected 14d period

Tectonic Profile

Seismotectonic hazard assessment, structural exposure & historical context

Associated Faults3

Click to locate on map

Regional PopulationLandScan

Living within 180 km of the city centre

Building VulnerabilityModerate

Mixed construction stock with regional engineering standards

Tectonic Setting

Transform / Strike-Slip

Critical Hazard

Major plate boundary with high strain accumulation

Seismically Stable Period

No significant earthquakes recorded in the selected 14d period.

PAGER GREEN

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Oct 22, 08:35:04 PM

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Seismic Activity

Every recorded earthquake in this area — filter by time range and sort by time or severity.

No earthquake activity data available for this period.

Regional Volcanism & Monitored Vents

Active vents and Holocene volcanic structures within the monitored boundary (San Francisco) · 1

Last eruptionVolcano & TypeDetailsSummit

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Clear Lake Volcanic Field

Volcanic field•United States

GVP

1.4 km

Catalogue: Smithsonian Institution, Global Volcanism Program.Volcanoes of the World

Emergency services

Cal OES

911 Official site

Frequently Asked Questions (FAQ)

Verified scientific, operational, and emergency protocols

The event table on this page lists every earthquake recorded inside the felt radius of San Francisco, newest first, with its distance from the city centre and its magnitude. The top row is therefore the most recent event, and the list updates as soon as a reporting agency publishes a solution.