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California Earthquake Swarm: Understanding the Recent Seismic Activity
Episode 1004th February 2026 • EM Morning Brief • Brian Colburn
00:00:00 00:03:26

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This episode provides a comprehensive overview of the impending winter weather advisories that will affect various regions from the Mid Atlantic down to parts of North Carolina. We discuss the forecasted light snow and potential for slick travel conditions that may arise from these advisories, particularly focusing on areas such as southeast Virginia and northeast North Carolina. Additionally, we highlight the concerns regarding black ice, especially in regions like Long Island and southern Connecticut, which necessitate vigilance among residents. The episode also addresses seismic activity in California, specifically the small quakes recorded around San Ramon Dublin, reminding listeners to ensure their homes are secure. We conclude with a summary of weather conditions across other states, underscoring the importance of staying informed and prepared as these weather events unfold.

Takeaways:

  1. The National Weather Service has issued winter weather advisories across the Mid Atlantic region, indicating hazardous travel conditions due to expected light snow and icy roads.
  2. Black ice warnings have been issued for regions in Connecticut and Long Island, highlighting the importance of caution for drivers this morning.
  3. Residents in Alaska should prepare for brisk winds and blowing snow, with advisories in effect for coastal waters and inland regions, particularly around Fairbanks.
  4. Ongoing seismic activity has been reported in California's San Ramon Dublin area, with minor quakes reminding residents to ensure their homes are secure.
  5. North Carolina will experience winter weather advisories tonight, with potential hazardous travel conditions due to light snow and icy surfaces expected by Thursday morning.
  6. Georgia is experiencing dense fog in North Georgia, which is reducing visibility significantly, necessitating caution for morning commuters.

Sources

[NWS Anchorage – Coastal Waters/Advisories (Feb 3–4 AKST) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=all]

[USGS Event — M1.7, 3 km ESE of San Ramon (2026-02-04 00:22 UTC) | https://earthquake.usgs.gov/earthquakes/eventpage/nc75307997]

[USGS Event — M1.7, 5 km SE of San Ramon (2026-02-04 05:37 UTC) | https://earthquake.usgs.gov/earthquakes/eventpage/nc75308142]

[SCSN Recent CA/NV Quakes list (includes 2.1 near Dublin at 03:06 UTC-8) | https://scedc.caltech.edu/recent/Quakes/quakes0.html]

[NWS New York (OKX) – Special Weather Statement (Feb 3 eve–Feb 4 am) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=okx&wwa=all]

[NWS Peachtree City (FFC) – Special Weather Statement (Feb 4, 5:54 am EST) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=all]

[NWS Goodland – Hazardous Weather Outlook (Feb 4) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=all]

[NWS Raleigh – Latest Briefing (Feb 4) | https://www.weather.gov/media/rah/briefing/NWSRaleighLatestBriefing.pdf]

[NWS Wakefield/Morehead/RAH – WWA/HWO text (Feb 4) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=all]

[NWS Sioux Falls – Special Weather Statement (Feb 4) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=all]

[NWS Wakefield – Winter Weather Advisory text (Feb 4) | https://forecast.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=winter+weather+advisory]

[NWS Wakefield – Latest Briefing (Feb 3–4) | https://www.weather.gov/media/akq/briefings/LatestBriefing.pdf] [NWS Wakefield – Marine SCAs (Feb 4) | https://www.weather.gov/wwamap/wwatxtget.php?cwa=usa&wwa=all]

Transcripts

Speaker A:

Good morning.

Speaker A:

,:

Speaker A:

Thank you for listening and as you're listening to us on Substack, you can find this show on your favorite podcast player.

Speaker A:

Monday through Friday Winter weather advisories expand across the Mid Atlantic tonight into Thursday morning with the National Weather Service calling for light snow and slick travel from southeast Virginia into into northeast North Carolina.

Speaker A:

Marine small craft advisories also line the lower Chesapeake farther north.

Speaker A:

Black ice concerns linger early today around Long island and southern Connecticut after refreeze out west.

Speaker A:

USGS continues to log small quakes around San Ramon Dublin in California.

Speaker A:

Minor, but a reminder to secure homes and check plans.

Speaker A:

Alaska's coastal waters face brisk winds and blowing snow today into Thursday per the Anchorage and Fairbanks offices.

Speaker A:

Let's run through the states.

Speaker A:

Alaska Brisk wind advisories and small craft advisories continue across portions of Bristol Bay, the Alaska Peninsula and the northern Gulf.

Speaker A:

Fairbanks Highlights blowing snow, reducing visibility to one nautical mile or less at times for northwest coastal waters.

Speaker A:

California USGS records additional small quakes overnight in the San Ramon Dublin area, including magnitude 1.7 events just after 4:22pm PST Tuesday and 9:37pm consistent with this week's ongoing swarm.

Speaker A:

No damage reported.

Speaker A:

Connecticut NWS New York warns of patchy black ice this morning across southern Connecticut due to overnight refreeze on untreated surfaces.

Speaker A:

Georgia Patchy dense fog early this morning across parts of North Georgia reduces visibility below a half mile.

Speaker A:

Conditions improve after 10am Kansas Goodland issues a hazardous weather outlook, noting winter weather advisory potential in the short term period.

Speaker A:

Residents along the Colorado, Kansas, Nebraska border region should watch for slick spots and check updates today.

Speaker A:

North Carolina Winter weather advisories take effect this evening for parts of eastern and northeastern North Carolina including Martin, Pitt, Washington, Green, Beaufort, Duplin, Lenoir plus Berdie Gates, Hertford, Northampton Just across the VA line, NWS Raleigh's briefing highlights mainly light snow or glaze of ice with hazardous travel possible Thursday morning black ice risk where temps fall into the 20s overnight.

Speaker A:

South Dakota Sioux Falls Highlights light wintry nuisances in a special weather statement early today.

Speaker A:

Watch for brief slick spots and variable visibility with any passing snow showers.

Speaker A:

Virginia Winter weather advisories run 6pm to 4am for Hampton, Poquasson and Newport News and 6pm to 7am across parts of southeast Virginia and far northeast North Carolina with up to one inch of snow, brief sleet and slippery roads.

Speaker A:

Wakefield also notes SCAs on Lower Bay and coastal waters tonight Thursday.

Speaker A:

All other states have no significant updates in the last 24 hours.

Speaker A:

That's the brief for Wednesday, February 4th.

Speaker A:

Thank you for listening, and be sure to visit the emergency management network on substack.

Speaker A:

We'll continue to monitor and update with new official guidance.

Speaker A:

Stay safe.

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