Weber County
Population 278,174 (2025) 611 sq mi
Large wildfires have burned 12,533 acres of Weber County since 1984, 26th most of 29 counties in Utah; the largest was the Pintail Flat Fire in 2008.
Hazard fingerprint Each spoke is this county’s percentile among U.S. counties where that hazard occurs. How it is computed
- Tornado damage paths since 19508
- Wildfire burn scars since 19844
At a glance
The record for Weber County in eight numbers. Each links to its section below.
Acres burned since 1984
12,533
26th of 29 in Utah
4 large fires; the largest was Pintail Flat, 2008
DetailsStrongest tornado
F2
August 14, 1968, 1.5 mile path
Tornadoes
About one every 9.5 years since 1950, none rated F3/EF3 or stronger.
Strongest
August 14, 1968
F2, 1.5 mile path
50 yards wide.
Most recent
Wednesday, July 28, 2021
EFU, 0.2 mile path
5 years ago.
Every recorded tornado
| Jul 28, 2021 | EFU | 0.2 | 0 | 0 |
| Sep 22, 2016 | EF1 | 2.9 | 5 | 0 |
| Aug 20, 1998 | F1 | 0.1 | 6 | 0 |
| May 21, 1998 | F0 | 0.1 | 0 | 0 |
| May 29, 1996 | F1 | 1.3 | 1 | 0 |
| Dec 5, 1995 | F0 | 1.5 | 0 | 0 |
| Apr 23, 1990 | F0 | 0.1 | 1 | 0 |
| Aug 14, 1968 | F2 | 1.5 | 1 | 0 |
- Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Weber County: 0.
- Weak tornadoes were under-recorded before Doppler radar coverage became national in the early 1990s, so earlier decades read low. Ratings use the Fujita scale before February 2007 and the Enhanced Fujita scale after.
Storm Prediction Center severe weather database, 1950 to 2025.
Hurricanes and tropical storms
No tropical storm or hurricane has tracked within 100 miles since records began in 1851.
Wildfire and smoke
12,533 acres burned in 4 large fires since 1984, equal to 3.2% of the land.
Largest
April 18, 2008
Pintail Flat Fire, 5,170 acres
5,177 acres inside Weber County.
Most recent
April 18, 2008
Pintail Flat Fire
5,170 acres in total.
Every large fire
| Pintail Flat | 2008 | 5,177 | 5,170 |
| Freemont | 1995 | 3,119 | 3,118 |
| Wolf Creek Fire | 1995 | 1,214 | 1,214 |
| Powder Mountain | 1988 | 3,021 | 3,018 |
- Large fires mapped by the Monitoring Trends in Burn Severity program since 1984: 1,000 acres or more in the West, 500 or more in the East. Prescribed burns are excluded. Acres here are the part of each perimeter inside this place.
Monitoring Trends in Burn Severity (USGS and U.S. Forest Service), 1984 to 2026.
Smoke overhead
Smokiest year
2021: 55 days
Heavy smoke on 33 days in 2021, the most of any year.
Last 10 years
14.4 days a year
Medium or heavy smoke, 2016 to 2025.
2025
6 days
Medium or heavy smoke. 16 so far in 2026.
- A smoke day is a date on which a smoke plume traced by NOAA Hazard Mapping System analysts from satellite imagery covered this place's point (the county's population centre or the city centre). Counts here are of medium or heavy smoke. Since 2018 analysts have often drawn light smoke as one area over most of the continent, so light-smoke counts are not comparable from year to year. The plumes show smoke anywhere in the air above, not air quality at the ground, and smoke hidden by cloud is missed.
NOAA Hazard Mapping System smoke analysis, 2011 to 2026, retrieved October 30, 2026.
Floods and flood insurance
89 federal flood insurance claims since 1979, with $321,000 paid.
Most claims in one year
2017: 9 claims
$38,000 paid.
2nd most
2023: 8 claims
$44,000 paid.
3rd most
1983: 7 claims
$50,000 paid.
Claims by ZIP code
| 84414 | 19 | $25,000 |
| 84403 | 17 | $18,000 |
| 84401 | 13 | $57,000 |
| 84404 | 12 | $5,925 |
| 84405 | 11 | $86,000 |
| 84310 | 7 | $109,000 |
| 84317 | 6 | $21,000 |
Flood events since 1996
- Flood14
- Heavy Rain5
- Flash Flood4
1 death recorded in flood events since 1996.
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.
River crests
Most severe crest
May 3, 1952
South Fork Ogden River near Huntsville, 5.98 ft
1.38 feet above the 4.6 ft flood stage; moderate flooding by today’s categories.
Most recent moderate or major crest
May 3, 1952
South Fork Ogden River near Huntsville, 5.98 ft
Moderate flooding.
| May 3, 1952 | South Fork Ogden River near Huntsville | 5.98 | +1.38 |
| May 4, 1936 | South Fork Ogden River near Huntsville | 5.45 | +0.85 |
| May 10, 1923 | South Fork Ogden River near Huntsville | 5.40 | +0.80 |
| May 16, 1984 | South Fork Ogden River near Huntsville | 5.40 | +0.80 |
| May 14, 1932 | South Fork Ogden River near Huntsville | 5.35 | +0.75 |
| May 14, 1997 | South Fork Ogden River near Huntsville | 5.31 | +0.71 |
| May 30, 1983 | South Fork Ogden River near Huntsville | 5.23 | +0.63 |
| May 4, 1986 | South Fork Ogden River near Huntsville | 4.91 | +0.31 |
| Apr 30, 1927 | South Fork Ogden River near Huntsville | 4.80 | +0.20 |
| Apr 28, 1928 | South Fork Ogden River near Huntsville | 4.70 | +0.10 |
| May 1, 1980 | South Fork Ogden River near Huntsville | 4.67 | +0.07 |
| May 11, 1998 | South Fork Ogden River near Huntsville | 4.66 | +0.06 |
| May 21, 2005 | South Fork Ogden River near Huntsville | 4.49 | −0.11 |
| May 14, 1929 | South Fork Ogden River near Huntsville | 4.40 | −0.20 |
| Apr 19, 1962 | South Fork Ogden River near Huntsville | 4.39 | −0.21 |
| May 8, 1937 | South Fork Ogden River near Huntsville | 4.30 | −0.30 |
| May 19, 1997 | Ogden River below Pineview Reservoir | 6.71 | −0.79 |
| Jun 6, 1999 | Ogden River below Pineview Reservoir | 6.70 | −0.80 |
| May 9, 2005 | Ogden River below Pineview Reservoir | 6.66 | −0.84 |
| May 4, 1998 | Ogden River below Pineview Reservoir | 6.43 | −1.07 |
| Dec 18, 1991 | Ogden River below Pineview Reservoir | 6.20 | −1.30 |
| May 23, 1993 | Ogden River below Pineview Reservoir | 6.06 | −1.44 |
| Mar 30, 1995 | Ogden River below Pineview Reservoir | 5.79 | −1.71 |
| Apr 18, 2006 | Weber River near Plain City | 24.70 | −2.30 |
| Aug 9, 2002 | Ogden River below Pineview Reservoir | 5.15 | −2.35 |
River gauges
| Ogden River below Pineview Reservoir | 7.5 | 6.71 ft | 0 |
| South Fork Ogden River near Huntsville | 4.6 | 5.98 ft | 0 |
| Weber River near Plain City | 27.0 | 24.70 ft | 0 |
- Crests are the highest and the recent crests the National Weather Service lists for each river gauge in the county that has a flood stage, not every flood. Flood categories use each gauge's current flood stages; crests from before levees, dams or channel changes may not be comparable. Crests measured on an old datum are left out of the rankings.
NOAA National Water Prediction Service gauge records, retrieved October 30, 2026.
Drought
In severe drought or worse for 160 of 1,581 months since 1895 (10%); the longest spell lasted 19 months.
160
Months in severe drought or worse since 1895
37
Months in extreme drought
10%
Share of all months, severe or worse
Lowest reading
May 1934
−6.68, extreme drought
Longest severe spell
19 months
October 1933 to April 1935.
Latest month
September 2026
−3.01, severe drought
- The Palmer Drought Severity Index is computed by NOAA each month from the county's average temperature and precipitation, relative to the county's own climate. Zero is normal; -3 or lower is severe drought and -4 or lower extreme drought. It describes the long-term balance of moisture, not water supply or crop losses.
NOAA NCEI nClimDiv county Palmer Drought Severity Index, 1895 to September 2026, issued October 6, 2026.
Earthquakes and landslides
44 earthquakes of magnitude 4 or more within 50 miles since 1900; the largest was magnitude 6.6 in 1934.
15
Magnitude 2.5+ inside the county since 1973
185
Magnitude 3+ within 50 miles since 1973
44
Magnitude 4+ within 50 miles since 1900
14
Magnitude 5+ within 50 miles since 1900
Largest within 50 miles
March 12, 1934
The 1934 Hansel Valley, Utah Earthquake; 36.4 miles away, 5.3 miles deep.
Most recent, magnitude 3 or more
May 28, 2026
Magnitude 3.1
12 km SSW of Snowville, Utah; 45.7 miles away.
Every earthquake of magnitude 4 or more within 50 miles
| Jan 22, 2026 | 4.7 | 39.1 |
| May 5, 2024 | 4.4 | 19.2 |
| Apr 16, 2020 | 4.2 | 28.4 |
| Apr 14, 2020 | 4.2 | 28.5 |
| Mar 18, 2020 | 4.6 | 27.3 |
| Mar 18, 2020 | 4.6 | 26.8 |
| Mar 18, 2020 | 4.2 | 29.9 |
| Mar 18, 2020 | 4.0 | 27.8 |
| Mar 18, 2020 | 5.7 | 27.6 |
| Apr 15, 2010 | 4.9 | 29.3 |
| Jun 3, 2009 | 4.0 | 28.9 |
| Mar 16, 1992 | 4.2 | 47.3 |
| Jul 5, 1989 | 4.5 | 26.6 |
| Jul 3, 1989 | 4.2 | 26.7 |
| Nov 19, 1988 | 4.2 | 39.1 |
| Nov 19, 1988 | 4.3 | 39.7 |
| Oct 25, 1987 | 4.6 | 36.8 |
| Oct 23, 1987 | 4.1 | 36.2 |
| Sep 24, 1987 | 4.2 | 32.6 |
| Sep 24, 1987 | 4.7 | 36.1 |
| Nov 4, 1976 | 4.1 | 40.7 |
| Mar 31, 1975 | 4.5 | 44.4 |
| Mar 29, 1975 | 4.7 | 49.2 |
| Oct 1, 1972 | 4.7 | 49.5 |
| Mar 17, 1966 | 5.2 | 26.1 |
| Oct 18, 1964 | 5.0 | 32.9 |
| Sep 5, 1962 | 5.0 | 29.8 |
| Aug 30, 1962 | 5.8 | 35.4 |
| May 6, 1934 | 5.5 | 39.3 |
| Apr 14, 1934 | 5.2 | 17.7 |
| Apr 6, 1934 | 5.5 | 5.3 |
| Mar 15, 1934 | 4.8 | 17.7 |
| Mar 15, 1934 | 5.1 | 17.7 |
| Mar 12, 1934 | 5.9 | 26.6 |
| Mar 12, 1934 | 5.1 | 17.7 |
| Mar 12, 1934 | 4.8 | 17.7 |
| Mar 12, 1934 | 6.6 | 36.4 |
| Aug 11, 1915 | 4.8 | 40.7 |
| Jul 30, 1915 | 4.0 | 25.7 |
| May 13, 1914 | 4.8 | Inside |
| Apr 8, 1914 | 4.0 | 10.8 |
| May 22, 1910 | 5.3 | 30.4 |
| Oct 5, 1909 | 5.6 | 39.9 |
| May 24, 1906 | 4.0 | Inside |
- Earthquakes of magnitude 2.5 or more in the USGS Comprehensive Catalog since 1900. Within 50 miles means the epicentre lies within 50 miles of the county boundary (or inside the county).
- Small earthquakes were under-recorded before the modern seismic networks of the 1970s and are still missed in remote areas, so early decades read low. Magnitudes are as the catalogue reports them and mix scales (moment, local and body-wave).
USGS ANSS Comprehensive Earthquake Catalog, 1900 to present, retrieved October 30, 2026.
Mapped landslides
1,686
Landslides mapped, probable or better
5
With a recorded date
3
Source inventories
Mapped by UT GRC (1,524), USGS Conterminous (157), NASA (5).
- Landslides mapped in the USGS compilation of landslide inventories across the United States (version 3.0, 2025), rated probable or better. The compilation joins inventories made by federal and state agencies for different purposes and areas, so the number mapped in a county reflects how closely it has been surveyed as much as how often its slopes fail. An area with few records may simply not have been mapped. Deaths are as recorded in the inventories; a slide listed in two inventories is counted once.
USGS Landslide Inventories across the United States, version 3.0, retrieved October 27, 2026.
Severe weather and other events
629 events in the National Weather Service record, 606 of them since 1996.
8
Hail reports, 1 inch or larger
0
Hail, 2 inches or larger
114
Damaging gusts, 58 mph+
345
Winter weather events since 1996
2
Heat events since 1996
1
Cold events since 1996
Largest hail
June 7, 2020
1.75 inches
Strongest measured or estimated gust
September 22, 2016
101 mph
More event types since 1996
| Lightning | 4 | 0 |
| Avalanches | 11 | 10 |
Costliest events since 1996
- Dec 1, 2011High Wind, Northern Wasatch Front$82.0 million
National Weather Service narrative
A strong and destructive downslope windstorm impacted the northern Wasatch Front, with maximum recorded wind gusts of 102 mph in Centerville, 92 mph in West Bountiful, 86 mph in Farmington, and numerous other reports in the 60 to 80 mph range.||Damage from this windstorm was substantial and widespread, with the most extensive damage occurring between North Salt Lake and South Ogden. UDOT reported that 11 semitrailers were knocked over along I-15, which eventually led them to close the road to semis for several hours. In Fruit Heights, a steeple was blown off the roof of a church. Hundreds of trees, power lines, and light poles were knocked over, and some of these caused additional…
- Sep 8, 2020High Wind, Northern Wasatch Front$4.3 million
National Weather Service narrative
A historic downslope wind event unfolded along the Northern Wasatch Front. The peak wind gust for the event, not only in this zone, but across the state, was a 99 mph peak wind gust recorded by the US-89 at Park Lane sensor. Other notable peak wind gusts included 97 mph at Farmington, 84 mph at Hill Air Force Base, 82 mph in North Brigham City, 75 mph at Brigham City Regional Airport, 75 mph at Centerville, and 64 mph at Ogden-Hinckley Airport. Extensive wind damage was reported along the entire Wasatch Front, with widespread downed trees, damaged roofs and power outages. Transportation was heavily impacted with all major north-south (Interstate 15, Interstate 84, and U.S. Highway…
- Sep 22, 2016Tornado$2.0 million
National Weather Service narrative
A tornado touched down in Riverdale in Weber County. The tornado moved rapidly to the northeast, but was not consistently on the ground. It skipped on several occasions in Riverdale, producing primarily EF0 damage to trees and a several homes. The tornado then produced a more continuous swath of damage through Washington Terrace producing EF1 damage to numerous homes, structures, as well as many trees. Finally, the tornado skipped briefly into South Ogden producing EF0 damage before dissipating. One person suffered a head injury and took private transportation to a hospital. A few others were cut by flying glass, but were not hospitalized. The many downed trees across the area…
- Apr 1, 2023Heavy Snow, Wasatch Back$1.0 million
National Weather Service narrative
A snowfall accumulation of 15.3 inches with 0.83 inches of snow water equivalent was observed at Wanship. Other snowfall observations include 12.8 inches with 0.76 inches of snow water equivalent at Oakley and 12.5 inches with 0.92 inches of snow water equivalent at Eden-Liberty. Three structural collapses occurred on April 3 in Park City. The first involved a garage, the second was a chimney, and the third was related to the home.
- May 1, 2016High Wind, Northern Wasatch Front$1.0 million
National Weather Service narrative
Damage from the downslope wind storm was widespread across Davis and Weber Counties, as well as parts of Box Elder County, with the strongest observed winds occurring in Centerville and Farmington. Peak recorded wind gusts from the event included 91 mph at the US-89 at Park Lane sensor, 87 mph in Farmington, 81 mph in Centerville, 74 mph at the Brigham City Airport, 70 mph in South Ogden, and many other reports in the 55-70 mph range.||There was one wind-related fatality, when strong winds pushed a pickup truck onto the shoulder of Interstate 15, where it it had been traveling near Parrish Lane. The pickup crashed into the back of a semitruck, which had pulled over to the side of…
- Apr 30, 2016High Wind, Northern Wasatch Front$1.0 million
National Weather Service narrative
Damage from the downslope wind storm was widespread across Davis and Weber Counties, as well as parts of Box Elder County, with the strongest observed winds occurring in Centerville and Farmington. Peak recorded wind gusts from the event included 91 mph at the US-89 at Park Lane sensor, 87 mph in Farmington, 81 mph in Centerville, 74 mph at the Brigham City Airport, 70 mph in South Ogden, and many other reports in the 55-70 mph range.||There was one wind-related fatality, when strong winds pushed a pickup truck onto the shoulder of Interstate 15, where it it had been traveling near Parrish Lane. The pickup crashed into the back of a semitruck, which had pulled over to the side of…
- Sep 5, 2017Wildfire, Northern Wasatch Front$849,000
National Weather Service narrative
The Uintah Fire started on September 5 near the mouth of Weber Canyon. The fire was sparked by a downed power line and spread rapidly due to strong easterly canyon winds in the area, eventually burning 619 acres. More than 900 people were evacuated from their homes in the cities of Uintah and South Weber on September 5 before being allowed to return by September 7. The fire destroyed three homes and damaged two other homes and a mixed-use property. In total, the fire destroyed or damaged 18 structures. The estimated damage was $849,000, with operational costs to fight the fire at around $273,000. The fire was contained on September 10.
- May 29, 1996Tornado$600,000
National Weather Service narrative
Another severe thunderstorm in Weber County spawned a stronger F1 tornado. Experts estimated winds were between 73-112 mph (63-97 kts) based on the damage they inspected. The tornado touched down on the west side of Washington Boulevard at 2100 North. It then travelled east along the north side of Washington Blvd. for approximately 1.25 miles. Two homes sustained major damage from trees falling on them. Parked automobiles at the Health Spa on Washington Blvd. were pushed sideways and 1 car received major damage due to flying debris. Numerous mature trees were downed in the twister's wake. Amazingly only one person sustained slight injuries to her face when windows broke in on her.…
- May 22, 2011Flood$550,000
National Weather Service narrative
Flooding occurred along the South Fork of the Ogden River through the end of May, with the gauge near Huntsville reaching a peak of 1417 cfs on May 24th. This flooding impacted campgrounds and summer homes near Huntsville. In addition, flooding did major damage to Old Snow Basin Road, which officials estimated would take $500,000 to repair.
- Feb 16, 2026Winter Storm, Wasatch Mountains I-80 North$500,000
National Weather Service narrative
A powerful winter storm brought heavy snow and strong winds to the area. Reported snow observations include 27 inches of snow in the Logan Mountains (3.1 inches water), 23 inches of snow at Powder Mountain (2.5 inches water), and 18 inches of snow at Snowbasin - Base (1.9 inches of water). Additionally, several SNOTEL stations including Lightning Ridge, Ben Lomond Peak, and Monte Cristo recorded from 1.6 to 2.7 inches of snow water equivalent, resulting in approximately 21 to 37 inches of snow. Some peak wind gust observations through the event include 97 mph at Snowbasin - Straw Top, 78 mph at Snowbasin - Strawberry Tower 15, and 76 mph at Ogden Peak. Inclement conditions also…
- Storm Events records before 1996 cover only tornadoes, thunderstorm wind and hail. Damage figures are as reported by the National Weather Service at the time, not adjusted for inflation.
NOAA NCEI Storm Events Database, 1950 to 2026, issued October 26, 2026.
Weather records
From Ogden Hinkley Airport, 2.6 miles from the county’s population centre, with records from 1948.
- All-time high
- 106°F3 times, most recently Jul 12, 2024
- All-time low
- −13°FJan 25, 1949
- Warmest night
- 80°F2 times, most recently Jul 27, 2026
- Coldest day
- 10°FJan 6, 2017
- Wettest day
- 3.36 inAug 4, 1951
- Hottest year
- 2024mean 57.0°F
- Coldest year
- 1951mean 49.5°F
- Wettest year
- 194922.32 in
- Driest year
- 20207.86 in
Station Ogden Hinkley Airport (USW00024126), 4,449 ft elevation, 2.6 miles from the population centre. Daily records from 1948 to October 25, 2026; 94.3% of days in the last 30 years are complete. Records at a single station can differ from a city’s official threaded record, which may combine several stations.
NOAA NCEI Global Historical Climatology Network Daily.
Federal disaster declarations
11 since 1953. The most recent: Straight-Line Winds, January 12, 2021.
| Jan 12, 2021 | Severe Storm | DR-4578-UT |
| Apr 4, 2020 | Biological | DR-4525-UT |
| Mar 13, 2020 | Biological | EM-3478-UT |
| Sep 5, 2017 | Fire | FM-5206-UT |
| Aug 8, 2011 | Flood | DR-4011-UT |
| Sep 5, 2005 | Coastal Storm | EM-3223-UT |
| Jul 15, 2003 | Fire | FM-2480-UT |
| Mar 13, 1986 | Flood | DR-760-UT |
| Aug 17, 1984 | Flood | DR-720-UT |
| Apr 30, 1983 | Flood | DR-680-UT |
| Jan 20, 1977 | Drought | EM-3024-UT |
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
OpenFEMA Disaster Declarations Summaries, retrieved October 30, 2026. Statewide declarations are not listed.
How this compares
Where Weber County stands among 29 counties in Utah and 3,143 in the United States.
| Tornadoes since 1950 | 8 | 6 / 29 |
| Tornadoes rated F3/EF3 or stronger | 0 | — |
| Tropical cyclones within 50 mi | 0 | — |
| Hurricane-strength passes within 50 mi | 0 | — |
| Wildfire acres since 1984 | 12,533 | 26 / 29 |
| Flood insurance claims | 89 | 4 / 29 |
| Flood insurance paid | $321,000 | 7 / 29 |
| Disaster declarations | 11 | 4 / 29 |
| Flood events since 1996 | 23 | 14 / 29 |
| Hail and wind events since 1996 | 225 | 5 / 29 |
| Winter storm events since 1996 | 345 | 6 / 29 |
| Reported damage since 1996 | $97.5 million | 3 / 29 |
| River crests at major flood stage | 0 | — |
| High tide flooding days a year, last 10 years | 0.0 | — |
| Months in severe drought since 1895 | 160 | 23 / 29 |
| Medium or heavy smoke days a year, last 10 years | 14.4 | 7 / 29 |
| Earthquakes M4+ within 50 mi since 1900 | 44 | 7 / 29 |
| Earthquakes M2.5+ in the county since 1973 | 15 | 23 / 29 |
Neighbouring counties
| Box Elder County | 10 | 0 |
| Cache County | 4 | 0 |
| Davis County | 12 | 0 |
| Morgan County | 1 | 0 |
| Rich County | 2 | 0 |
| Tooele County | 5 | 0 |
Sources and vintage
Every number on this page comes from these public records.
- Tornadoes NOAA Storm Prediction Center severe weather database, through 2025.
- Tropical cyclones NOAA National Hurricane Center HURDAT2 (Atlantic; Northeast and Central Pacific), through 2025.
- Wildfire USGS/USFS Monitoring Trends in Burn Severity, through 2026.
- Storm events NOAA NCEI Storm Events Database, through 2026.
- Flood insurance OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026.
- Declarations OpenFEMA Disaster Declarations Summaries v2, retrieved October 30, 2026.
- Weather records NOAA NCEI Global Historical Climatology Network Daily, station USW00024126.
- River crests NOAA National Weather Service, National Water Prediction Service river gauges, retrieved October 30, 2026.
- Drought NOAA NCEI nClimDiv county Palmer Drought Severity Index, through September 2026.
- Smoke NOAA NESDIS Hazard Mapping System smoke analysis, retrieved October 30, 2026.
- Landslides USGS Landslide Inventories across the United States, version 3.0 (2025).
- Earthquakes USGS ANSS Comprehensive Earthquake Catalog (ComCat), retrieved October 30, 2026.
Joins, thresholds and known limits are set out in the methodology. Found an error? Report it. Page built October 30, 2026.