There is a very cool phone app I have been using for a while. It is called “Rockd” and has access to geological maps and information throughout the US. In addition to the maps, it also has references to the sources, which is very helpful for geologists. Think of it as a geological map for anywhere you go. There are social aspects to the app as well, which can be fun, but I still find the maps and data to be the best. It is available for both Android and Apple phones. It is also free, developed by the University of Wisconsin. Try it out!
Featured Image – 5/21/2021
From the Archives –
This map of the Lake Elsinore area comes to us from San Diego County dating from November 1883. At the time, Elsinore was a part of San Diego County. In 1893, this area became a part of Riverside County.
June Highway Presentation
On June 1, 2021 at 6 pm, I will be giving a Zoom presentation for the Historic Highway 99 Association of California on US 99 in Lake Shasta with photos of the exposed highway and information about reservoir levels. Come join us!
https://zoom.us/meeting/register/tJItduuuqDkoGtYW7kV9Mcxa3QI4FOGQLFCR
Finding Old Highways Presentation
On Tuesday, May 4, 2021, I hosted a Zoom presentation for the Historic Highway 99 Association of California on the topic of finding old highways. This presentation included information about survey monuments, pavement styles, bridge types, and more. A recording of the presentation is now available for viewing and download. Please follow the link below to view.
There will be an additional presentation in the near future to cover some additional topics that weren’t covered and to have a bit more detail in others.
Earthquake Information
Felt an earthquake? Want to know where it was and how big? Follow the links below to get up-to-date information from the USGS and the California Geological Survey.
If you felt the earthquake, let the USGS know by contacting them at: “Did You Feel It?“ This data helps them determine magnitude of the earthquake, how the geology affects that, and how the type of structure reacts to the event. Most earthquakes larger than 4.0 are listed in the “Events” section of the page.
Additional Earthquake Information:
- Real-Time Map from the California Integrated Seismic Network (CISN)
- Real-Time Map from the USGS
- USGS Earthquake Notification Service – Get e-mails from the USGS when earthquakes happen
- Live Seismograms Feed – Southern California Seismic Network (SCSN)