Images

Text "Landslide Basics" on green background, infographic made for landslide basics page

Fast-moving, highly destructive debris flows triggered by intense rainfall are one of the most dangerous post-fire hazards. The risk of floods and debris flows after fires increases due to vegetation loss and soil exposure. Cases of sudden and deadly debris flow are well documented along the western United States, particularly in Southern California.

地震发生区域

国家地震灾害模型，2023 年

纽约市的地震

您知道自己生活在“地震带”吗?这是真 的。纽约市等地过去曾发生过地震，将来 还会发生。如果您感到地面在震动，请确 保知道怎么做:趴下、掩护和稳住!

如果您感觉到地面在震动

趴下 掩护 稳住

规模最大的地震 - 纽约市 - 1884年8月10日 - 震级 5.2

KOTE GEN TRANBLEMANNTÈ

(Modèl risk tranblemanntè nan nivo nasyonal, 2023)

TRANBLEMANNTÈ NAN VIL NEW YORK

TITLE: WHERE EARTHQUAKES OCCUR

MAP: National Seismic Hazard Model, 2023

HEADING: EARTHQUAKES IN NYC

LÀ OÙ LES SÉISMES SE PRODUISENT

Modèle de l’aléa sismique au niveau national, 2023

LES SÉISMES DANS LA VILLE DE NEW YORK

This hazard map is a simplified 2% in 50-year probability of exceedance map for fixed VS30 760 m/s.

From the 2003 NSHM by Mueller et al., 2010, the distribution of spectral acceleration (SA in %g) is shown for Puerto Rico and the U.S. Virgin Islands.

A landslide monitoring station within the footprint of the 2016 Fish Fire in the San Gabriel Mountains of southern California.  The station collects surface and subsurface data to monitor and detect changes in local hillslope hydrologic conditions.  

The USGS Postfire Landslide Monitoring Station “Maria Ygnacio” is located within the Los Padres National Forest in the Santa Ynez Mountains of southern California. The site consists of surface and subsurface instrumentation that is monitoring the hillslope shown in this image.

University of Puerto Rico, Mayagüez and USGS scientists working on the Añasco monitoring station

Stephen Hughes, Gabriel Colón, and Ednet López stand on hillslope next to completed landslide monitoring station at Añasco, Puerto Rico

Situated on a vegetated hillslope surrounded by cattle, is the Añasco monitoring station. A fence was built around the station to keep the grazing cattle from damaging any of the station components

Figure showing photos of minor and major postfire hydrologic response following storms in coastal California, from the study "Postfire hydrologic response along the Central California (USA) coast: insights for the emergency assessment of postfire debris-flow hazards".

Charlie Miles performing field work on the Alaskan Gyre at the Prince William Sound, Alaska

Pit dug for collection of geologic data and observations, such as geochronology samples to determine the age of faulted surfaces and documentation and dating of faulted recent sediments of the Puya Fault in northern New Mexico, 4/25/2023.

Map showing distribution of average annualized earthquake loss by region. The high concentration of loss in California and the West Coast is consistent with that region’s high seismic hazard, significant population, and building exposure. 

Although most economic loss is concentrated along the west coast, the distribution of relative earthquake risk, as measured by the Annualized Earthquake Loss Ratio (AELR), is spread throughout the country and it reinforces the fact that earthquakes are a national problem.

Landslides near the 2017 Thomas fire burn area that initiated during a series of atmospheric river events in December 2022 and January 2023.  

Estefania Vicens, Tania Figueroa, Kimberly Trahan, Victor Ortega stand next to completed Mayagüez monitoring station, part of the Puerto Rico Landslide Monitoring Network

University of Puerto Rico-Mayagüez students Estefania Vicens, Tania Figueroa, Anishka Ruiz, Cesar Rodriguez, and Kimberly Maisonet stand next to completed landslide monitoring station at Yauco, Puerto Rico, part of the Landslide Monitoring Network.