SZ4D Implementation Plan Infographic (With permission from Harold, Tobin, Univ. of Washington) Members of the Subduction Zones in 4-Dimensions (SZ4D) initiative are pleased to present to you the first draft of the SZ4D implementation plan. The SZ4D community has been working to develop plans that will make their vision of coordinated research to understand the processes that underlie subduction zone hazards a reality. This document is emphatically a draft - a concrete starting point for discussions with agencies and other potential partners.  The document is 162 pages long ..read more

Nearly half of Americans are exposed to potentially damaging earthquakes where they work and live. Still others will be at risk when traveling. It’s a good idea for everyone, everywhere to know how to protect themselves during an earthquake. Be prepared and join millions of people participating in Great ShakeOut Earthquake Drills worldwide October 21st. During the drill, participants practice “Drop! Cover! and Hold On!”  and other recommended safety actions to take during an earthquake. There are even resources for people with disabilities available at the Earthquake C ..read more

a, Topographic shaded relief map of the Costa Rica margin (from Global Multi-Resolution Topography (GMRT) synthesis within GeoMapApp45). The Middle American Trench (MAT) is shown with a black line and black triangles on the upper plate. The 2011 coverage of the 3D seismic reflection volume (CRISP) is shown with a white rectangle. b, Inline 2150 from the CRISP volume showing the trench, frontal prism (green) and outer wedge with interpreted sections of slope sediments (yellow) and margin wedge (blue). c, Perspective view of the shallow megathrust looking seaward towards the trench an ..read more

Every year, the United States experiences dozens, if not hundreds, of natural hazard events that can vary in size and impact – some are incredibly large and affect people across several states and communities, and some are more localized impacting only a relatively small number of people. Regardless of the size or impact, every hazard event is unique, and each one provides an opportunity for USGS scientists to learn more about what causes them. The more we know about hazards, the better we can find ways to help communities prepare for events, stay safe when they occur and recover onc ..read more

Seismic instruments indicate the earthquake was shallow, originating at a depth of about 12.5 miles beneath the city of Acapulco. Perceived shaking for the quake was very strong near the epicenter. Moderate shaking was felt in Mexico City. Map shows past earthquakes and the epicenter of the September 7, 2021 Acapulco, Mexico earthquake. (Credit: USGS. Public domain.) Visit the USGS earthquake event page for more information. The preliminary USGS Prompt Assessment of Global Earthquakes for Response (PAGER) report is Orange for both shaking-related fatalities and economic losses, indicating sig ..read more

The earthquake occurred 78 miles (125 km) west of the capital city of Port-au-Prince at a depth of 6.2 miles (10 kilometers). The preliminary USGS PAGER report shows RED for shaking-related fatalities and economic losses – indicating high casualties are probable and significant damage is likely. Given the likely impact of this event, a significant international response seems likely. Local earthquake information: Ayiti-SEISMES | Accueil (unice.fr) The earthquake occurred in Haiti's southwest peninsula, about 60 miles (100 km) west of the devastating January 2010 M 7.0 earth ..read more

Damage to the Washington National Cathedral in D.C. from the earthquake in central Virginia on August 23, 2011. (Credit: William Leith, USGS. Public domain.) Although not the strongest earthquake to have occurred in the eastern U.S., let alone the western U.S., the Virginia earthquake was likely felt by more people than any earthquake in North America’s history. This is due to the large distances at which people felt ground shaking and because of the density of the population in the eastern U.S. “The 2011 earthquake in Virginia was significant in raising awareness of east coast earthquak ..read more

Perceived shaking for the quake was weak to light in Anchorage. As of 2:51 am local time, 268 "Did You Feel It?" reports were submitted.  USGS scientists expect that this event will trigger aftershocks, but these will decrease in frequency over time. See the aftershock forecast for details.  The earthquake occurred as the result of thrust faulting at shallow depth on the subduction zone interface between the Pacific plate and the North America plate, where the Pacific plate begins subducting to the northwest beneath Alaska. Large earthquakes in this region are common ..read more

(used with permission, limited use by USGS only) Sessions Mentoring New Professionals: Bill Anderson Fund and Knauss Sea Grant Fellowship Monday, July 12, 1:30 to 3:00 p.m. MDT ShakeAlert and SAFRR: The Role of Evaluation in Reshaping Federal Hazards Programs Wednesday, July 14, 9:45 to 10:45 a.m. MDT Policy Progress: A Listening Session on the National Landslide Preparedness Act Wednesday, July 14, 8:30 to 9:30 a.m. MDT Modeling Post-Earthquake Population Displacement and Long-Term Community Recovery Challenges Tuesday, July 13, 3:30 to 5:00 p.m. MDT Incorporating Climate Change, Equity, and ..read more

The earthquake struck about 20 miles southwest of Smith Valley, NV. Perceived shaking for the quake was very strong. The event was widely felt, with close to 15,000 "Did You Feel It?" reports thus far submitted. USGS scientists expect that this event will trigger aftershocks, but these will decrease in frequency over time. See the aftershock forecast for details. The USGS is coordinating its response with the California Geological Survey. Visit the USGS earthquake event page for more information. For estimates of casualties and damage, visit the USGS Prompt Assessment of Global ..read more