Other engineering and risk research efforts related to the NSHM include: 1) developing earthquake scenarios for response planning, 2) extending the ground shaking forecast to ground failures such as soil liquefaction that can cause additional damage, and 3) studying the interactions of multiple hazards for engineering and risk assessments of infrastructure systems. The M6.4 event ruptured along the NE-SW trending fault, and the subsequent M7.1 event ruptured along the NW-SE trending fault. ![]() To broaden the utility of the NSHM beyond traditional design and assessment of buildings, USGS engineers and scientists are currently exploring potential applications that assess seismic risk for other critical infrastructure systems such as gas pipelines, highway bridges, and dams. Mainshock and aftershock locations shortly after M7.1 event, exhibiting a distinctive T pattern created by two perpendicular fault zones. New studies in southern and central California, Seattle, Portland, Reno, and Las Vegas will be performed to determine if these basin regions need special treatment within the NSHM. Leaflet Powered by Esri Basemap: GoogleMap Data Sources: PHIVOLCS, MGB, PAGASA, DepEd. ![]() The 2023 update for the Lower 48 states will also focus on better characterizing shaking within sedimentary basins, large geological depressions generally filled with soft sediments down to deep bedrock, where major urban areas are often centered. Earthquakes are shown as circles sized by magnitude (red, < 1 hour blue, < 1 day, yellow, < 1 week). Double-click/tap on the map to start assessment click here. The Hawaii portion of the NSHM has already been updated to reflect, in part, a swath of new earthquakes related to volcanic eruptions that have changed the way we understand ground shaking on the Island of Hawai‘i. The 2023 NSHM will include recently updated ground motion models for subduction-zone faults (present in the Pacific Northwest and Alaska) as part of its updated national hazard assessment. The USGS is currently working on the updated hazard model for the 50 states targeted for completion and release in 2023.
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