California Geological Survey

Info about the Golden State’s earthquakes, geology, & minerals from scientists at the California Geological Survey (CGS), a division of @CalConservation

[California Geological Survey @CAGeoSurvey]

The California Geological Survey is thrilled to announce the release of the newest edition of California Geology Magazine!

https://t.co/yE9nvKnOAR

[California Geological Survey @CAGeoSurvey]

Between July 20 (12:00 AM PST) and July 26 (11:59 PM) there were 46 earthquakes in California of magnitude 2.0 or larger.

🔸42 earthquakes between magnitude 2.0 - 2.9
🔸4 earthquakes between magnitude 3.0 - 3.9

The largest earthquake was a magnitude 3.6 near Brawley, CA.

[Utah Geological @utahgeological]

We are hiring!

The Geologic Mapping and Paleontology Program at UGS is looking for a full-time, permanent Preparator – Field Paleontologist to help document, preserve, and promote Utah’s vast paleontological resources.

Learn more and apply by 8/6/2026: https://t.co/vEaG3OyGi5

[California Geological Survey @CAGeoSurvey]

Between July 13 (12:00 AM PST) and July 19 (11:59 PM) there were 54 earthquakes in California of magnitude (M) 2.0 or larger.

🔸51 quakes between M2.0 - 2.9
🔸2 quakes between M3.0 - 3.9
🔸1 quakes between M4.0 - 4.9

The largest earthquake was a M4.3 N of Johannesburg, CA.

[California Geological Survey @CAGeoSurvey]

Explore our Postfire Debris Flow database, an interactive map of debris flow events since 2000, built on data from government agencies, media, scientific literature, and the public. https://t.co/I00j9KEvU4

[California Geological Survey @CAGeoSurvey]

To learn more about this effort or to download a high-resolution copy of the map visit https://t.co/bqEBp0btGC

[California Geological Survey @CAGeoSurvey]

NEW MAP! The brand-new California Geological Survey (CGS) Postfire Debris Flow Potential Map depicts the combined annual probability of wildfire and subsequent debris flow that is triggered by rainfall. https://t.co/bqEBp0btGC

[California Geological Survey @CAGeoSurvey]

To help communities prepare for postfire hazards, the CGS developed a statewide prefire model to provide info on potential postfire debris-flow hazards across California. The map products from this effort can be used to better inform potential mitigation strategies prior to fire.

[California Geological Survey @CAGeoSurvey]

Visit our Earthquake Dashboard at https://t.co/3Bi0ftqw43

[California Geological Survey @CAGeoSurvey]

Between July 6 (12:00 AM PST) and July 12 (11:59 PM) there were 61 earthquakes in California of magnitude (M) 2.0 or larger.

🔸55 quakes between M2.0 - 2.9
🔸4 quakes between M3.0 - 3.9
🔸2 quakes between M4.0 - 4.9

The largest earthquake was a magnitude 4.4 N of Covelo, CA.

[California Geological Survey @CAGeoSurvey]

RT @USGS_ShakeAlert: Good morning Southern California! Did you feel the magnitude 4.2 earthquake about 1 mile southeast of Frazier Park at…

[California Geological Survey @CAGeoSurvey]

Explore the fascinating history of California captured in the Sierra Nevada Earth Science Atlas!

A high-resolution PDF of the map is available here https://t.co/yRn6CbXFyd

[California Geological Survey @CAGeoSurvey]

Contained in the rocks of the Sierra Nevada is a story that spans more than 500 million years. https://t.co/yRn6CbXFyd

[California Geological Survey @CAGeoSurvey]

The story continues through the uplift, erosion, and glaciation that shaped the landscapes, soils, and mineral wealth that define California today.

[California Geological Survey @CAGeoSurvey]

Visit our Earthquake Dashboard to learn more! https://t.co/3Bi0ftqw43

[California Geological Survey @CAGeoSurvey]

Between June 29 (12:00 AM PST) and July 5 (11:59 PM) there were 45 earthquakes in California of magnitude 2.0 or larger.

🔸41 earthquakes between magnitude 2.0 - 2.9
🔸4 earthquakes between magnitude 3.0 - 3.9

The largest earthquake was a magnitude 3.9 near Alder Springs, CA.

[California Geological Survey @CAGeoSurvey]

A magnitude 5.6 earthquake occurred 11 km N of Redwood Valley, CA at 8:10 am. This earthquake produced strong to very strong shaking near the epicenter and light shaking that was felt across Northern California.

CGS is monitoring the situation.

https://t.co/Vy1JsaRxqI