Kidder County

Population 2,393 (2025) 1,351 sq mi

Kidder County has recorded 24 tornadoes since 1950, 35th most of 53 counties in North Dakota; the most recent was on June 27, 2025.

Hazard fingerprint for Kidder County Tornado: 25th percentile. Tropical: 0th percentile. Wildfire: 0th percentile. Flood: 5th percentile. Hail & wind: 18th percentile. Heat: 4th percentile. Cold: 81th percentile. Winter: 70th percentile. TORTROPFIREFLOODSEVEREHEATCOLDWINTER

Hazard fingerprint Each spoke is this county’s percentile among U.S. counties where that hazard occurs. How it is computed

2026
  • Tornado damage paths since 195024
  • Wildfire burn scars since 19841

At a glance

The record for Kidder County in eight numbers. Each links to its section below.

Tornadoes since 1950

24

35th of 53 in North Dakota

About as many as the typical North Dakota county

Details

Acres burned since 1984

2

30th of 53 in North Dakota

1 large fire; the largest was Chase Lake, 1985

Details

Strongest tornado

F4

July 1, 1952, 48.0 mile path

Federal disaster declarations

26

Most recent: Severe Storms, Straight-Line Winds, and Tornadoes, 2025

Details

Record high

118°F

July 6, 1936

Details

Record low

−48°F

December 20, 1916

Details

Snowiest season

112.3in

Winter of 2022-23

Costliest event since 1996

$5.0M

Thunderstorm Wind, June 25, 1999

Details

Tornadoes

About one every 3.2 years since 1950, one of them rated F3/EF3 or stronger.

Strongest

July 1, 1952

F4, 48.0 mile path

150 yards wide; 1 killed along the whole path.

Most recent

Friday, June 27, 2025

EFU, 1.3 mile path

Within the past year.

Tornadoes by decade Doppler radar era² 1950s: 2 2 1960s: 3 3 1970s: 0 1980s: 4 4 1990s: 7 7 2000s: 3 3 2010s: 1 1 2020s: 4 4 1950s1960s1970s1980s1990s2000s2010s2020s
Recorded tornadoes per decade. The 2020s are incomplete.
Tornadoes by month J: 0 F: 0 M: 0 A: 0 M: 4 J: 9 9 J: 7 A: 4 S: 0 O: 0 N: 0 D: 0 JFMAMJJASOND
By month of occurrence, all years.

Every recorded tornado

Tornadoes in Kidder County since 1950
Jun 27, 2025EFU1.310000
Jun 20, 2025EF112.520000
Aug 28, 2024EF10.930000
May 19, 2021EFU0.25000
May 24, 2010EF12.47000
Aug 24, 2006F01.04000
Jun 21, 2003F00.03000
Jul 17, 2001F230.088000
Jun 25, 1999F13.03000
Jun 3, 1999F24.05000
Aug 5, 1997F00.11000
Jul 9, 1995F00.11000
Jul 3, 1994F00.11000
Jul 1, 1993F00.11000
May 21, 1992F10.25000
Jun 12, 1988F10.55010
May 10, 1985F00.11000
Aug 24, 1983F00.31000
Jun 2, 1983F00.31000
Jun 22, 1963F10.11000
Jul 27, 1960F00.11000
Jul 4, 1960F00.11000
Jun 17, 1956F237.15000
Jul 1, 1952F448.0150261
  1. Injuries and deaths are for the tornado’s whole path, which may extend beyond the county. Deaths recorded within Kidder County: 0.
  2. 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

2 acres burned in 1 large fire since 1984.

Largest

April 29, 1985

Chase Lake Fire, 1,209 acres

2 acres inside Kidder County.

Most recent

April 29, 1985

Chase Lake Fire

1,209 acres in total.

Acres burned since 1984, cumulative 1985: 2 2 acres 198519901995200020052010201520202025
Running total of acres burned inside the county (line) and each year’s acres (bars).

Every large fire

Large wildfires since 1984
Chase Lake198521,209
  1. 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

2023: 71 days

Heavy smoke on 40 days in 2021, the most of any year.

Last 10 years

34.5 days a year

Medium or heavy smoke, 2016 to 2025.

2025

28 days

Medium or heavy smoke. 44 so far in 2026.

Days with medium or heavy smoke overhead, by year 2011: 8 2012: 20 2013: 14 2014: 14 2015: 27 2016: 15 2017: 22 2018: 38 2019: 11 2020: 24 2021: 60 2022: 23 2023: 71 71 2024: 53 2025: 28 201120122013201420152016201720182019202020212022202320242025
Days each year on which a satellite-traced plume of medium or heavy smoke covered the county’s population centre, 2011 to 2025.
  1. 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

No federal flood insurance claims are recorded for this county.

Flood events since 1996

  • Flash Flood5
  • Flood3
  • Heavy Rain3

OpenFEMA NFIP Redacted Claims v3, refreshed August 4, 2026. NOAA Storm Events through 2026.

Drought

In severe drought or worse for 128 of 1,581 months since 1895 (8%); the longest spell lasted 24 months.

128

Months in severe drought or worse since 1895

54

Months in extreme drought

8%

Share of all months, severe or worse

9

Drought reports to the Weather Service since 1996

Lowest reading

September 1936

−6.94, extreme drought

Longest severe spell

24 months

June 1988 to May 1990.

Latest month

September 2026

+1.56, slightly wet

Last severe month: September 2021.

Months in severe drought or worse, by year 1895: 0 1896: 0 1897: 0 1898: 0 1899: 0 1900: 2 1901: 1 1902: 0 1903: 0 1904: 0 1905: 0 1906: 0 1907: 0 1908: 0 1909: 0 1910: 8 1911: 9 1912: 0 1913: 0 1914: 0 1915: 0 1916: 0 1917: 0 1918: 0 1919: 0 1920: 0 1921: 0 1922: 0 1923: 0 1924: 0 1925: 0 1926: 2 1927: 0 1928: 0 1929: 0 1930: 0 1931: 0 1932: 0 1933: 0 1934: 9 1935: 4 1936: 8 1937: 12 12 1938: 2 1939: 10 1940: 7 1941: 0 1942: 0 1943: 0 1944: 0 1945: 0 1946: 0 1947: 0 1948: 0 1949: 0 1950: 0 1951: 0 1952: 0 1953: 0 1954: 0 1955: 0 1956: 0 1957: 0 1958: 0 1959: 3 1960: 0 1961: 3 1962: 0 1963: 0 1964: 0 1965: 0 1966: 0 1967: 0 1968: 0 1969: 0 1970: 0 1971: 0 1972: 0 1973: 2 1974: 0 1975: 0 1976: 5 1977: 6 1978: 0 1979: 0 1980: 3 1981: 0 1982: 0 1983: 0 1984: 0 1985: 0 1986: 0 1987: 0 1988: 7 1989: 12 1990: 5 1991: 1 1992: 0 1993: 0 1994: 0 1995: 0 1996: 0 1997: 0 1998: 0 1999: 0 2000: 0 2001: 0 2002: 2 2003: 0 2004: 0 2005: 0 2006: 1 2007: 0 2008: 0 2009: 0 2010: 0 2011: 0 2012: 0 2013: 0 2014: 0 2015: 0 2016: 0 2017: 0 2018: 0 2019: 0 2020: 0 2021: 4 2022: 0 2023: 0 2024: 0 2025: 0 18951905191519251935194519551965197519851995200520152025
Months each year with a Palmer index of −3 or lower, 1895 to 2025. Twelve means the whole year.
  1. 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

1 earthquake of magnitude 4 or more within 50 miles since 1900; the largest was magnitude 4.4 in 1968.

0

Magnitude 2.5+ inside the county since 1973

0

Magnitude 3+ within 50 miles since 1973

1

Magnitude 4+ within 50 miles since 1900

0

Magnitude 5+ within 50 miles since 1900

Largest within 50 miles

July 8, 1968

Magnitude 4.4

Near Huff, North Dakota; 31.4 miles away, 16.8 miles deep.

Most recent, magnitude 3 or more

July 8, 1968

Magnitude 4.4

Near Huff, North Dakota; 31.4 miles away.

Every earthquake of magnitude 4 or more within 50 miles

Earthquakes of magnitude 4 or more within 50 miles
Jul 8, 19684.431.416.8Near Huff, North Dakota
  1. 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).
  2. 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

35

Landslides mapped, probable or better

0

With a recorded date

1

Source inventory

Mapped by ND GS (35).

  1. 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

469 events in the National Weather Service record, 434 of them since 1996.

92

Hail reports, 1 inch or larger

8

Hail, 2 inches or larger

88

Damaging gusts, 58 mph+

103

Winter weather events since 1996

1

Heat events since 1996

31

Cold events since 1996

Largest hail

August 31, 1997

4.50 inches

Strongest measured or estimated gust

June 25, 1999

110 mph

More event types since 1996

Other Storm Events types since 1996
Dense fog and smoke100May 17, 2023

Costliest events since 1996

  1. Jun 25, 1999Thunderstorm Wind$5.0 million
    National Weather Service narrative

    Damage to 200 farm buildings. fifty one metal power line towers collapsed. twenty two irrigation system destroyed.

  2. Jan 9, 1997Blizzard, Kidder$1.5 million
    National Weather Service narrative

    The second blizzard in less than 1 week brought North Dakota to a virtual standstill. This blizzard didn't bring as much snow as the first storm, but the winds gusted from the northwest as high at 40 mph and they lasted for 3 days. Snowfall amounts from this storm varied from 1-2 inches in the southwest to 2-4 inches in the central. But the strong winds combined with this snow as well as the snow from the blizzard a few days earlier created widespread whiteout conditions that lasted for 3 days. There were numerous communities that halted mail delivery and cancelled school. In Emmons Co. every road was blocked by drifts, some as high as 18 feet. In McLean Co. there was a drift at…

  3. Apr 4, 1997Blizzard, Kidder$1.5 million
    National Weather Service narrative

    A dramatic rescue took place to save the life of a farmer that had a heart attack. With all major roads drifted shut to the farmhouse, neighbors and county crews pitched in to save the man's life. County plows were able to get within 5 miles of the farmhouse, but couldn't go any farther, Neighbors with 4x4 tractors then pulled the ambulance and road plows through the snwo to get to the farmyard. It took 10 hours to reach the man, and luckily he is still alive today.

  4. Apr 1, 2009Flood$1.3 million
    National Weather Service narrative

    Heavy overland flooding from snowmelt damaged two homes and numerous state, county, and local roads.

  5. Jul 17, 2001Tornado$1.0 million
    National Weather Service narrative

    Tornado reported to be 1/2 mile wide at times. The tornado remained in open country before entering into Stutsman county. Damage was contained to metal and double poled high power line towers. A farmstead in the path of the tornado sustained $200,000 in damage. (see Stutsman county report on same tornado.)

  6. Jan 15, 1997Blizzard, Kidder$900,000
    National Weather Service narrative

    The 3rd blizzard to hit North Dakota in less than 3 weeks affected mainly the east-central and eastern part of the state. Again, like the previous blizzard, the winds was the major weather factor. Wind gusts at times were over 50 mph. This created widespread blowing and drifting snow. All major roads in the area were closed again for the 3rd time this year. In Logan Co. the machine shed that is used by the Logan Co. Historical Society to store antiques was damaged by the roof falling in. With the severity of the blowing and drifting snow, roads that were just opened from the last storm were once again blown shut. This lead to the death of a 71 yr. old Fredonia(Logan Co.) man. He…

  7. Jan 21, 1997Blizzard, Kidder$790,000
    National Weather Service narrative

    The last in a string of 4 blizzards to hit North Dakota struck in the morning of the 22nd. Snow amounts with this storm ranged from 2-4 inches, but northwest winds gusted to near 45 mph. Again, east-central and eastern North Dakota were hardest hit. I-29 in North Dakota and I-94 from Bismarck to Fargo were closed again. Injuries and damage amounts estimated.

  8. Jun 20, 2025Tornado$750,000
    National Weather Service narrative

    This is the first event entry for one tornado that passed through two counties, Kidder and Stutsman. This Quasi-Linear Convective System (QLCS) tornado started northwest of Crystal Springs in Kidder County and moved to the east-southeast. The tornado then shifted towards the east-northeast near the Stutsman County line, and continued into Stutsman County before it lifted to the north-northwest of Medina. Near the point of touchdown, a machine shed was completely destroyed, with the roof laying in a pasture about 350 feet away. Approximately five miles to the south-southeast, two additional farmsteads in close proximity were struck. The first one had an older barn along with a pole…

  9. Aug 28, 2024Tornado$600,000
    National Weather Service narrative

    The tornado touched down in an oats field to the east-southeast of Steele, with the plants twisted and downed in multiple directions. Approximately one mile east of |Steele the tornado crossed the path of a stopped train and about 40 empty railroad cars were knocked off the tracks. The tracks ran from west to east, with some cars falling north, and some falling south. In addition, near the derailed cars, a grove of hardwood trees suffered damage, with a few trees uprooted. The tornado then lifted one mile northeast of Steele. Based on the damage done this tornado was rated high-end EF-1, and from that wind speeds were estimated to be around 110 mph.

  10. Jun 25, 1999Thunderstorm Wind$400,000
  1. 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 Napoleon, 27.9 miles from the county’s population centre, with records from 1893.

All-time high
118°FJul 6, 1936
All-time low
−48°FDec 20, 1916
Warmest night
81°FJul 10, 1936
Coldest day
−31°FJan 11, 1912
Wettest day
5.32 inAug 17, 2014
Snowiest day
16.0 inApr 4, 2026
Hottest year
1934mean 45.9°F
Coldest year
1907mean 36.6°F
Wettest year
197729.41 in
Driest year
19369.07 in
Snowiest season
112.3 in2022-23
Average monthly high and low temperature and precipitation, last 30 years, Napoleon 32°F 21° 1° 0.5 Jan 25° 4° 0.5 Feb 37° 16° 0.9 Mar 53° 28° 1.6 Apr 66° 41° 2.9 May 76° 53° 3.6 Jun 83° 58° 2.7 Jul 81° 55° 2.4 Aug 72° 47° 1.8 Sep 56° 33° 1.6 Oct 39° 19° 0.6 Nov 25° 8° 0.8 Dec Precipitation, inches
Average daily high and low by month, and average monthly precipitation, over the last 30 years.
Nights at or below freezing per year 1975: 176 1976: 204 1977: 168 1978: 152 1980: 185 1981: 184 1989: 195 1990: 201 1991: 194 1992: 188 1993: 197 1994: 175 1995: 186 1996: 205 1997: 185 1998: 170 1999: 171 2000: 177 2001: 177 2002: 211 211 2003: 182 2004: 191 2005: 182 2006: 190 2007: 171 2008: 191 2009: 183 2010: 172 2011: 183 2012: 174 2013: 199 2014: 186 2015: 166 2024: 177 1975199320032013
Nights at or below freezing each complete year, last 50 years. Thirty-year average: 183.1.
Snowfall by winter 1976: 31.4 in 1977: 58.7 in 1979: 31.0 in 1980: 17.5 in 1981: 79.6 in 1982: 29.5 in 1983: 59.5 in 1984: 36.4 in 1985: 52.7 in 1990: 30.2 in 1991: 28.0 in 1992: 57.2 in 1993: 96.6 in 1994: 69.5 in 1995: 81.6 in 1996: 108.4 in 1997: 36.3 in 1998: 58.7 in 1999: 32.7 in 2000: 43.2 in 2001: 44.5 in 2002: 45.3 in 2003: 46.4 in 2004: 16.4 in 2005: 32.9 in 2006: 41.0 in 2007: 23.5 in 2008: 93.4 in 2009: 57.2 in 2010: 92.6 in 2011: 20.6 in 2012: 53.9 in 2013: 46.9 in 2014: 40.7 in 2015: 36.3 in 2016: 65.0 in 2017: 46.8 in 2018: 83.5 in 2019: 68.4 in 2020: 21.2 in 2021: 56.7 in 2022: 112.3 in 112.3 2025: 52.0 in 19761991200120112021
Total snowfall each winter (July to June), last 50 winters.

Median first snow

October 30

Earliest: September 13, 1903

Median last snow

April 16

Latest: May 27, 1932

0 of 111 winters had no measurable snow.

Station Napoleon (USC00326255), 1,980 ft elevation, 27.9 miles from the population centre. Daily records from 1893 to October 24, 2026; 92.6% 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

26 since 1953. The most recent: Severe Storms, Straight-Line Winds, and Tornadoes, October 22, 2025.

Federal disaster declarations
Oct 22, 2025Severe StormSevere Storms, Straight-Line Winds, and TornadoesMajor disasterDR-4895-ND
Sep 11, 2025Severe StormSevere Storm, Tornadoes, and Straight-Line WindsMajor disasterDR-4888-ND
Feb 5, 2023SnowstormSevere Winter Storm, Snowstorm, and Straight-Line WindsMajor disasterDR-4686-ND
Jul 13, 2022Severe StormSevere Winter Storm and FloodingMajor disasterDR-4660-ND
Sep 1, 2021Severe StormSevere Storm, Straight-Line Winds, and FloodingMajor disasterDR-4613-ND
Jul 9, 2020FloodFloodingMajor disasterDR-4553-ND
Apr 1, 2020BiologicalCovid-19 PandemicMajor disasterDR-4509-ND
Mar 13, 2020BiologicalCovid-19EmergencyEM-3477-ND
Jan 21, 2020FloodFloodingMajor disasterDR-4475-ND
Jul 12, 2013Severe StormSevere Storms and FloodingMajor disasterDR-4128-ND
May 10, 2011FloodFloodingMajor disasterDR-1981-ND
Apr 30, 2010FloodFloodingMajor disasterDR-1907-ND
Mar 24, 2009Severe StormSevere Storms and FloodingMajor disasterDR-1829-ND
Sep 13, 2005Coastal StormHurricane Katrina EvacuationEmergencyEM-3247-ND
Jul 22, 2005Severe StormSevere Storms, Flooding, and Ground SaturationMajor disasterDR-1597-ND
May 28, 2001FloodSevere Storms, Flooding, & Ground SaturationMajor disasterDR-1376-ND
Jun 27, 2000Severe StormSevere Storms, Flooding and Ground SaturationMajor disasterDR-1334-ND
Jun 8, 1999FloodSevere Storms, Flooding, Snow, Ice, Ground Saturation, Lanslides, Mudslides, and TorMajor disasterDR-1279-ND
Apr 7, 1997FloodSevere Flooding,Severe Winter Storms, Snowmelt, Spring RainsMajor disasterDR-1174-ND
Jan 12, 1997Severe StormSevere Winter Storms and Blizzard ConditionsMajor disasterDR-1157-ND
Jun 5, 1996Severe StormSevere Storms,Flooding, & Ice JamsMajor disasterDR-1118-ND
May 16, 1995Severe StormSevere Storms, Flooding, and Ground SaturationMajor disasterDR-1050-ND
Jul 1, 1994Severe StormSevere Storms, FloodingMajor disasterDR-1032-ND
Jul 26, 1993FloodSevere Storms & FloodingMajor disasterDR-1001-ND
Apr 26, 1979FloodSevere Storms, Snowmelt & FloodingMajor disasterDR-581-ND
Jul 21, 1976DroughtDroughtEmergencyEM-3016-ND

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 Kidder County stands among 53 counties in North Dakota and 3,143 in the United States.

Ranks
Tornadoes since 19502435 / 531,324 / 3,143
Tornadoes rated F3/EF3 or stronger116 / 531,281 / 3,143
Tropical cyclones within 50 mi0——
Hurricane-strength passes within 50 mi0——
Wildfire acres since 1984230 / 531,505 / 3,143
Flood insurance claims0——
Flood insurance paid$0——
Disaster declarations2625 / 53672 / 3,143
Flood events since 19961135 / 532,869 / 3,143
Hail and wind events since 199625831 / 531,500 / 3,143
Winter storm events since 199610334 / 53923 / 3,143
Reported damage since 1996$17.1 million29 / 531,594 / 3,143
River crests at major flood stage0——
High tide flooding days a year, last 10 years0.0——
Months in severe drought since 189512827 / 531,516 / 3,143
Medium or heavy smoke days a year, last 10 years34.525 / 5338 / 3,143
Earthquakes M4+ within 50 mi since 190012 / 531,397 / 3,143
Earthquakes M2.5+ in the county since 19730——

Neighbouring counties

Neighbouring counties
Burleigh County6006,880698
Emmons County4305,66482
Logan County19003
Sheridan County24005
Stutsman County5807,559127
Wells County27002

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 USC00326255.
  • 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.