California Geological Survey

Visit our earthquake dashboard at cadoc.maps.arcgis.com/apps/dashboa...

Infographic that shows a map of California on the left. Red dots of different sizes show the locations of earthquakes of different magnitudes. On the right as a bar graph showing the number of earthquakes of different sizes. 

Between March 2 (12:00 AM PST) and March 8 (11:59 PM) there were 52 earthquakes in California of magnitude 2.0 or larger.

🔸47 earthquakes between magnitude 2.0 - 2.9
🔸5 earthquakes between magnitude 3.0 - 3.9

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

Visit our earthquake Dashboard at cadoc.maps.arcgis.com/apps/dashboa...

Infographic with a map of CA. Red dots are earthquakes and the sizes of the dots indicate the magnitude. On the right is a bar graph showing the number of earthquakes of different sizes.

Between February 23 (12:00 AM PST) and March 1 (11:59 PM) there were 44 earthquakes in California of magnitude 2.0 or larger.

🔸39 earthquakes between magnitude 2.0 - 2.9
🔸5 earthquakes between magnitude 3.0 - 3.9

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

Collage of images from the magazine

This brand-new issue contains articles about California’s mineral resources, post-fire debris flow hazards, geoscience education, and much more.

Image of sunlight filtering through a slot canyon. At the top in white letters it reads “California Geology”. At the bottom it includes small lettering outlining articles that can be found inside. Across the middle it says “New Release” in yellow.

The California Geological Survey is thrilled to announce the release of the newest edition of California Geology Magazine! www.conservation.ca.gov/cgs/document...

Visit our earthquake dashboard at cadoc.maps.arcgis.com/apps/dashboa...

infographic showing a map of California on the left-hand side. Dots of different sizes indicate the location of earthquakes and their relative magnitudes. On the right hand side is a bar graph showing the number of earthquakes of different sizes.

Between February 16 (12:00 AM PST) and February 22 (11:59 PM) there were 63 earthquakes in California of magnitude 2.0 or larger.

🔸60 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 magnitude 4.2 near Cobb, CA.

Infographic showing a map of California with earthquakes shown as dots of various sizes and a bar graph

Between February 2 (12:00 AM PST) and February 8 (11:59 PM) there were 36 earthquakes in California of magnitude 2.0 or larger.

🔸97 earthquakes between M2.0 - 2.9
🔸8 earthquakes between M3.0 - 3.9
🔸2 earthquakes between M4.0 - 4.9

The largest earthquake was a magnitude 3.7 west of Petrolia, CA.

To view our Earthquake Dashboard visit cadoc.maps.arcgis.com/apps/dashboa...

Map of California with earthquake locations indicated by red dots. The size of the dot indicates the relative magnitude. On the right is a bar graph showing the magnitude of different earthquakes that have occurred in the last week.

Between January 26 (12:00 AM PST) and February 1 (11:59 PM) there were 36 earthquakes in California of magnitude 2.0 or larger.

🔸31 earthquakes between magnitude 2.0 - 2.9
🔸5 earthquake between magnitude 3.0 - 3.9

The largest earthquake was a magnitude 3.4 near San Ramon, CA.

To see more California earthquake statistics visit our dashboard at cadoc.maps.arcgis.com/apps/dashboa...

Infographic with a map of California on the left side. The map shows red dots, indicating the location of the earthquake, and the size of the dot shows the magnitude of the earthquake. On the right hand side is a bar graph showing the number of earthquakes of different magnitude.

Between January 19 (12:00 AM PST) and January 25 (11:59 PM) there were 83 earthquakes in California of magnitude 2.0 or larger.

🔸70 earthquakes between M2.0 - 2.9
🔸10 earthquake between M3.0 - 3.9
🔸3 earthquake between M4.0 - 4.9

The largest earthquake was a magnitude 4.9 near Indio, CA.

Please note – due to internal system upgrades this report covers 2 more days than previous reports. To see the Earthquake Dashboard please visit cadoc.maps.arcgis.com/apps/dashboa...

Map of CA on the left with red dots of different sizes indicating earthquakes of different sizes. On the right is a bar graph showing number of earthquake in earthquake magnitude group.

Between January 12 (12:00 AM PST) and January 20 (8:30 AM) there were 85 earthquakes in California of magnitude 2.0 or larger.

🔸65 earthquakes between M2.0 - 2.9
🔸16 earthquake between M3.0 - 3.9
🔸4 earthquake between magnitude 4.0 - 4.9

The largest earthquake was a magnitude 4.9 near Indio, CA.

CGS improves earthquake resilience in the state by providing science-based guidance to communities, mapping earthquake hazards, providing data used to improve building design & performance, and working with partners so future events don’t become disasters. www.conservation.ca.gov/cgs/earthqua...

The Northridge earthquake caused $20 billion in damage, plus $40+ billion in economic loss, making it the co​stliest earthquake in U.S. history. www.conservation.ca.gov/cgs/earthqua...

Shake map showing the location of the Northridge earthquake. The different colors indicate different intensities of earthquake shaking. The strongest shaking, indicated by red, is centered under Northridge, California.

32 years ago, at 4:31 AM, a magnitude 6​.7 earthquake struck southern California. This quake, centered in Northridge, caused 57 fatalities and injured thousands.

To see more visit our interactive Dashboard at cadoc.maps.arcgis.com/apps/dashboa...

Map of California where red dots of different sizes show the location of earthquakes of different magnitudes. On the right is a bar graph showing the number of quakes of different magnitudes.

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

🔸38 earthquakes between M2.0 - 2.9
🔸4 earthquake between M3.0 - 3.9
🔸1 earthquake between M4.0 - 4.9

The largest earthquake was a magnitude 4.2 near Cloverdale, CA.

Large image of a geologic map. Along the bottom is a thumbnail list of different maps available on the website.

The California Geological Survey offers a variety of interactive web maps, including geologic and geohazard maps, mineral resource maps, and earthquake regulatory zone maps. These maps can be found here: maps.conservation.ca.gov/cgs/#datalist

Recent mapping in the Sierra Nevada mountains.

Geologic mapping of California continues with the Regional Geologic & Landslide Mapping Program. Maps include statewide geologic and fault activity maps, geologic atlas and regional geologic map series, and offshore continental margin maps. www.conservation.ca.gov/cgs/rgm/prog...

Visit our earthquake Dashboard at cadoc.maps.arcgis.com/apps/dashboa...

On the left-hand side is a map of California. Red dots indicate the location of the earthquakes and the size of the dot gives the relative magnitude. On the right hand side is a bar graph with the same information.

Between December 29 (12:00 AM PST) and January 4 (11:59 PM) there were 52 earthquakes in California of magnitude 2.0 or larger.

🔸50 earthquakes between M2.0 - 2.9
🔸1 earthquake between M3.0 - 3.9
🔸1 earthquake between M4.0 - 4.9

The largest earthquake was a magnitude 4.9 near Susanville, CA.

Map of California with the names of major features and towns and the major geologic provinces colored.

135 years have passed since the preparation of the 1891 Preliminary Mineralogical and Geological Map of the State of California.

This webpage walks you through the history and evolution of geologic maps of California. www.conservation.ca.gov/cgs/rgm/hist...

Map showing the outline of the state of California with very little detail.

Geologic mapping in California began about 180 years ago. The first geologic mapping in the State was done by Lieutenant Edward Belcher, a British naval officer. Although Belcher did the surveying for the map in 1826, it was not published until 1839. www.conservation.ca.gov/cgs/rgm/hist...

Old timey black and white photograph of Trask. He is wearing a uniform and is looking at the camera.

Headshot of Jeremy Lancaster. He is smiling and wearing a plaid tie.

In 1851 Dr. John B. Trask was named as “State Geologist”. Today, the CA State Geologist is Jeremy Lancaster. He leads the @cageosurvey.bsky.social in providing scientific products and services about the state's geology, seismology, geohazards, and minerals. www.conservation.ca.gov/cgs/about/hi...

Visit our Earthquake Dashboard to learn more cadoc.maps.arcgis.com/apps/dashboa...

In infographics showing a map of California on the left. The red circles indicate the location of earthquakes and the size of the circle indicates the relative magnitude. On the right is a bar graph showing the same information.

Between December 22 (12:00 AM PST) and December 28 (11:59 PM) there were 61 earthquakes in California of magnitude 2.0 or larger.

🔸57 quakes between M2.0 - 2.9
🔸3 quakes between M3.0 - 3.9
🔸1 quake between M4.0 - 4.9

The largest earthquake was a magnitude 4.7 near Susanville, CA.

Photo by Tim Dawson, Mesquite Flat Sand Dunes, Death Valley National Park. Dramatic sand dunes in the foreground give way to eroded mountains in the background.

California Geotour is an index of field trip information for people interested in visiting California's world-famous geologic features. This site contains geologic information, photographs, maps & directions for interesting geologic locations across the state. www.conservation.ca.gov/cgs/californ...