Earthquake Hazards

NSHMP Workshops

Please read the disclaimer at the bottom of the page about the content of these presentations.

Upcoming Workshops

November 18, 2020 - Workshop #2 for the 2020 Hawaii Hazard Maps - I want to attend

It has been about 20 years since the original USGS Hawaii seismic hazard model was released. Since then many scientific advances have been made that can be considered in this update, as well as an additional two decades of seismicity (including damaging earthquakes in October 2006 [M6.7] and May 2018 [6.9] on the Big Island). It has been a little over a year since the National Seismic Hazard Model Project (NSHMP) held a public workshop at the University of Hawaii at Manoa in which was presented the draft model. Based on feedback from the scientific community at that workshop, the NSHMP staff have spent the last year revising and improving the model. At Public Workshop #2, the proposed model will be presented, which will be submitted for publication by the end of 2020. This will be a virtual workshop (using Microsoft Teams). To attend this workshop, please fill out this form. Contact Allison Shumway with any questions.

The draft documentation (below) will be open for public review from November 13, 2020 to December 11, 2020. Please email your comments to Mark Petersen ( and Allison Shumway (

November 10, 12, and 17th, 2020 - Seismic Hazard Map Fault Model Workshops

This effort represents internal USGS deliberations, along with critical input from State geological surveys. The USGS invites you to join us for a virtual workshop where the draft updates will be previewed to local and regional experts. A key goal of these workshop is to solicit feedback on the updates to the fault geometries and the geologic slip rate database.

Following the virtual gatherings, experts have until December 4, 2020 to provide the USGS with written feedback on the materials presented at the workshop. Feedback should be sent directly to Alex Hatem at

To attend any of the workshops, please fill out this form, and you will receive further instructions on how to access workshop materials and virtual workshop links. The workshop will be hosted via Microsoft Teams using the email provided on the RSVP form. The workshop materials will be posted from a USGS-hosted website that will be shared directly to email address provided on the RSVP form.  Feel free to RSVP for either one or multiple workshops depending on your interest and expertise.

Intermountain West Seismic Hazard Map Fault Model Workshop - I want to attend
Tuesday, November 10th, tentatively 10 am – 3:50 pm Mountain time

California Seismic Hazard Map Fault Model Workshop - I want to attend
Thursday, November 12th, tentatively 10 am – 1:15 pm Mountain time

Pacific Northwest Seismic Hazard Map Fault Model Workshop - I want to attend
Tuesday, November 17th, tentatively 10 am – 1:15 pm Mountain time

Past Workshops

Workshops for the 2020 Hawaii Hazard Maps

Workshops for the 2018 National Hazard Maps


The U.S. Geological Survey produces National Seismic Hazard Maps that are the basis of seismic provisions of building design codes, earthquake insurance rate structures, and other public policy decision-making tools. Because of the significant safety and financial implications of these maps, they are held to a high level of scrutiny by earthquake engineering and science experts. The National Seismic Hazard Mapping Project, which has responsibility for the maps, has undertaken an extensive process to update these maps. We hold regional and topical open workshops across the country to solicit new information, to discuss potential changes, and to build consensus on the best available science. Workshop participants are welcome to show any information relevant to the topic of seismic hazard in the United States. The workshop presentations inform the community of the current methods, models, and data that are being considered in the update and provide credit to the presenters for their contributions. Moreover, these presentations are important in describing the current state of practice and in providing a historical context of prevalent thoughts of the hazard community at the time the maps were developed. However, all of the information shown at the workshop is pre-decisional, and not all of the information has been published or even reviewed. It is important for individuals accessing the workshop section of this website to understand that the workshop information is not endorsed by the USGS. A similar disclaimer also applies to un-reviewed USGS presentations that typically display impacts of a suite of alternative weighted-models on the seismic hazard maps. These presentations are shown for informational purposed only; the models shown in the presentations will not necessarily be included in the final maps. Final hazard maps will rely on published information, and the documentation will be published as a USGS Open-file report and as journal articles.