California Quaternary Fault Database Update

Judith Zachariasen, Rob Wurgler, & Meerea Kang

Submitted September 7, 2025, SCEC Contribution #14944, 2025 SCEC Annual Meeting Poster #TBD

The California Geological Survey (CGS) is updating the California Quaternary Fault Database (CQFD), revising it from the most current 2017 version. A broad range of end users in the academic, government, and consulting sectors use this database for a variety of purposes, and maintaining it is important to ensuring that derivative products reflect current understanding of faults in the state. To ensure that the database reflects the interests of end users, we are soliciting feedback from end users in two areas. First, we are interested in learning what elements of the existing database users value, and if there are additional elements that people would like to see included to provide added value to the product. Second, we would like to encourage people to provide their mapping to contribute to improvement of the database and keeping it current. To this end, we have created a new upload portal, which allows individual researchers to proactively upload new Quaternary fault mapping for consideration for inclusion in the CQFD (URL https://forms.office.com/g/XsC3WTLCtP). The portal provides a mechanism for people to upload GIS files of mapping along with basic metadata, as well as documentation explaining and supporting the mapping. By use of the portal, we hope to facilitate more frequent updates of the database as well as ensure that we are aware of relevant new mapping. Please help us make the California Quaternary Fault Database a valuable and current database for future fault-related investigations.

Citation
Zachariasen, J., Wurgler, R., & Kang, M. (2025, 09). California Quaternary Fault Database Update. Poster Presentation at 2025 SCEC Annual Meeting.

Related Projects & Working Groups
Earthquake Geology