Earthquakes (lime green dots). Past 30 days of earthquakes from the USGS GeoJSON feed, updated every 15 minutes, with size proportional to magnitude. As one zooms in, we plot smaller and smaller earthquakes. At max zoom, the smallest plotted are about M=0.0. When zoomed out to the entire globe, M≥4.7 quakes are plotted. The quakes are clickable, and if one clicks on “USGS” in the info window, you are taken to its USGS Event Page. High bandwidth is needed to plot quakes, so if you have limited internet, try turning them off.
Faults (red lines). We plot the fault traces (the intersection of a fault with the earth’s surface) from the USGS Quaternary Active Fault and Fold Database. Fault thickness is by the age of the most recent rupture (past 200 yr, past 20,000 yr, past 2 million yr). In future releases of Temblor, the faults will be clickable with their names and information in boxes. ‘Fault traces’ are different from ‘fault sources,’ which are typically rectangular, planar surfaces on which earthquakes of various sizes are assumed to rupture at various rates; the shaking in these ruptures is used to calculate hazard and damage.
Liquefaction (purple shades). Liquefaction occurs when unconsolidated and water-saturated sand and silt behave like a liquid when shaken. The soil can lose its ability to support buildings, it can flow down even gentle slopes, and erupt to the ground surface to form sand boils. Ratings of high-very high indicate liquefaction in a M>6.5 earthquake, ratings of moderate indicate liquefaction in a M≥8 event. Ratings of low-very low indicate that liquefaction is unlikely. There is uncertainty in liquefaction boundaries. Liquefaction potential is not considered in the hazard rank.
Landslide Susceptibility (green shades). Earthquakes can trigger devastating landslides. In the 2008 M=7.8 Wenchuan, China, earthquake, a majority of the 70,000 deaths were attributed to landslides inundating towns and villages. Landslides for the U.S. are compiled by the USGS. The Utah map is furnished by the Utah Geological Survey. ‘High’ indicates areas of existing modern or ancient landslides, ‘Moderate’ includes areas that have slopes prone to landsliding based on observed slope angles, and ‘Low’ indicates areas that have slopes that might produce landslides.
Washington
Washington DNR
Oregon
DOGAMI
Bay Area
USGS
Los Angeles
California Department of Conservation
Santa Barbara
Santa Barbara County
Riverside
Riverside County Geology and the California Geological Survey
Monterey
Monterey County
San Luis Obispo
San Luis Obispo County
Santa Cruz
Santa Cruz County
Arkansas
Arkansas Geologic Survey
Indiana
Indiana Geologic Survey
Alabama
Geologic Survey of Alabama
Mississippi, Tennessee, Kentucky, Illinois, Missouri
Central US Earthquake Consortium (CUSEC)
South Carolina
Norman Levine (College of Charleston)
Idaho Falls, Boise, Teton County, Wood River Valley
Idaho Geological Survey
Pocatello
Fugro
Utah
Utah Geological Survey
Taiwan
Data.gov.tw
California Landslide
California Geological Survey
Utah
Utah Geological Survey
Washington
Washington DNR
Oregon
DOGAMI
California
California Geological Survey
US
USGS
California Alquist Priolo Fault Zones
California Geological Survey
Oklahoma
Oklahoma Geologic Survey
New Zealand
GNS Science
Japan
Nakata T, Imaizumi T (eds) (2002) Digital Active Fault Map of Japan. University of Tokyo Press Tokyo DVD and 66 pp.
Taiwan
TEM Database
Afghanistan
USGS
Iran
USGS World Energy Project
Europe
USGS
SE Asia
Southeast Asia Fault-source Evaluation in 2016 (SAFE2016).
Wang et al. (JGR, 2014) with further modification
Baja California
Ensenada Center for Scientific Research and Higher Education (CICESE)
Sumatra
Sieh, K., & Natawidjaja D. (2000). Neotectonics of the Sumatran fault, Indonesia. Journal of Geophysical Research-Solid Earth. 105, 28295-28326
Ethiopia
National Research Council Of Italy, Institute Of Geosciences And Earth Resources
South America
Gabriel Veloza, Richard Styron, Michael Taylor, Andrés Mora, Open-source archive of active faults for northwest South America, Volume 22 Issue 10 (October 2012), pp. 4-10 (Active Tectonics of the Andes Database)
South American Risk Assessment (SARA) project of the GEM Foundation, funded by the Swiss Re Foundation
Turkey
MTA Database
Himalaya
Taylor, Michael, Yin, An. (2009). Active Structures of the Himalayan-Tibetan orogen and their relationships to earthquake distribution, contemporary strain field, and Cenozoic volcanism, Geosphere, Vol. 5, No. 3, p. 199-214
Mexico and Latin America
USGS
Plate Boundaries
Bird, P. (2003) An updated digital model of plate boundaries, Geochemistry Geophysics Geosystems, 4(3), 1027, doi:10.1029/2001GC000252.
Peter Bird et al., Bull. Seismol. Soc. Amer. (2015)