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Sierra County Natural Disasters and Weather Extremes

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The chance of earthquake damage in Sierra County is much lower than California average and is much higher than the national average. The risk of tornado damage in Sierra County is lower than California average and is much lower than the national average.

Topics:Earthquake Index Volcano Index Tornado Index Other Weather Extremes Events Volcanos Nearby Historical Earthquake Events Historical Tornado Events

Earthquake Index, #32

Sierra County	5.10
California	21.80
U.S.	1.81

The earthquake index value is calculated based on historical earthquake events data using USA.com algorithms. It is an indicator of the earthquake level in a region. A higher earthquake index value means a higher chance of an earthquake.

Volcano Index, #14

Sierra County	0.0103
California	0.0068
U.S.	0.0023

The volcano index value is calculated based on the currently known volcanoes using USA.com algorithms. It is an indicator of the possibility of a region being affected by a possible volcano eruption. A higher volcano index value means a higher chance of being affected.

Tornado Index, #46

Sierra County	2.47
California	18.56
U.S.	136.45

The tornado index value is calculated based on historical tornado events data using USA.com algorithms. It is an indicator of the tornado level in a region. A higher tornado index value means a higher chance of tornado events.

Other Weather Extremes Events

A total of 616 other weather extremes events within 50 miles of Sierra County were recorded from 1950 to 2010. The following is a break down of these events:

Type	Count	Type	Count	Type	Count	Type	Count	Type	Count
Avalanche:	0	Blizzard:	0	Cold:	0	Dense Fog:	2	Drought:	0
Dust Storm:	0	Flood:	82	Hail:	136	Heat:	0	Heavy Snow:	0
High Surf:	0	Hurricane:	0	Ice Storm:	0	Landslide:	0	Strong Wind:	17
Thunderstorm Winds:	121	Tropical Storm:	0	Wildfire:	22	Winter Storm:	10	Winter Weather:	0
Other:	226

Volcanos Nearby

A total of 7 volcanoes are found in or near Sierra County.

Distance (miles)	Name	Region	Latitude	Longitude	Elevation (foot)	Type	Status	Last Eruption
45.0	Steamboat Springs	US-Nevada, United States	39.375	-119.72	1415	Lava dome	Pleistocene-Fumarol	Quaternary eruption(s) with the only known Holocene activity being hydrothermal
74.5	Eagle Lake Field	US-California, United States	40.63	-120.83	1652	Fissure vent	Holocene	Unknown
81.9	Lassen Volc Center	US-California, United States	40.492	-121.508	3187	Stratovolcano	Historical	Last known eruption 1900-1963
87.1	Potato Butte	US-California, United States	40.63	-121.43	1532	Shield volcano	Holocene	Unknown
93.5	Tumble Buttes	US-California, United States	40.68	-121.55	2191	Cinder cone	Holocene	Unknown
100.7	Twin Buttes	US-California, United States	40.78	-121.6	1631	Cinder cone	Holocene	Unknown
105.0	Big Cave	US-California, United States	40.955	-121.365	1259	Shield volcano	Holocene	Unknown

Historical Earthquake Events

A total of 54 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Sierra County.

Distance (miles)	Date	Magnitude	Depth (km)	Latitude	Longitude
25.6	1966-09-12	6.5	N/A	39.4	-120.1
23.6	1948-12-29	6	N/A	39.55	-120.08
40.5	1940-02-08	6	35	39.75	-121.25
19.8	1959-04-01	5.6	N/A	39.72	-120.2
42.5	1950-12-14	5.6	N/A	40.1	-120.1
45.5	1952-05-09	5.4	N/A	39.4	-119.7
12.0	1943-03-30	5.3	N/A	39.43	-120.4
21.1	1966-09-12	5.3	N/A	39.4	-120.2
37.1	1979-02-22	5.3	5	40	-120.09
25.7	1947-09-08	5.2	N/A	39.3	-120.2
38.4	1953-09-26	5.2	N/A	39.6	-119.8
20.0	1980-11-28	4.9	10	39.29	-120.47
22.1	1980-11-28	4.9	10	39.26	-120.47
45.9	1951-01-22	4.8	N/A	39.08	-119.95
17.0	1966-09-14	4.7	N/A	39.4	-120.3
6.6	1959-06-14	4.6	N/A	39.67	-120.55
11.8	1958-10-01	4.6	N/A	39.57	-120.3
17.0	1966-09-22	4.5	N/A	39.4	-120.3
38.7	1941-05-01	4.5	N/A	40	-121
39.9	1950-12-14	4.5	N/A	40.1	-120.2
3.2	1960-11-18	4.4	N/A	39.6	-120.47
17.3	1971-04-27	4.4	5	39.43	-120.26
42.2	1950-12-15	4.4	N/A	40.08	-120.07
24.4	1954-04-07	4.3	N/A	39.37	-120.15
11.9	1947-05-10	4.2	N/A	39.6	-120.3
13.0	1967-01-10	4.2	N/A	39.5	-120.3
25.6	1966-09-12	4.2	N/A	39.4	-120.1
35.3	1951-02-19	4.2	N/A	40.07	-120.7
38.8	1966-09-12	4.2	N/A	39.5	-119.8
43.8	1950-10-26	4.2	N/A	39.62	-119.7
45.8	1981-04-29	4.2	7	39.27	-119.76
12.6	1954-05-29	4.1	N/A	39.47	-120.33
20.2	1983-07-03	4.1	13	39.41	-120.21
13.0	1966-09-13	4	N/A	39.5	-120.3
25.5	1982-02-19	4	10	39.91	-120.73
27.3	1961-08-12	4	N/A	39.27	-120.2
43.0	1947-11-25	4	N/A	39.3	-119.8
44.9	1950-11-10	4	N/A	39.63	-119.68
17.9	1966-09-28	3.9	N/A	39.5	-120.2
19.0	1982-01-05	3.9	23	39.85	-120.57
32.2	1950-11-02	3.9	N/A	39.62	-119.92
45.3	1977-02-01	3.9	2	39.06	-120
17.3	1962-04-29	3.8	N/A	39.78	-120.33
17.9	1971-04-27	3.8	2	39.5	-120.2
18.3	1967-09-28	3.8	N/A	39.55	-120.18
22.8	1981-03-28	3.8	16	39.4	-120.16
17.9	1966-09-27	3.7	N/A	39.5	-120.2
19.8	1983-07-03	3.7	14	39.41	-120.22
42.4	1968-02-26	3.7	N/A	40	-121.1
42.5	1964-04-25	3.7	N/A	40.1	-120.1
27.8	1954-12-13	3.6	N/A	39.28	-120.17
10.6	1981-01-02	3.5	27	39.73	-120.53
19.5	1967-09-27	3.5	N/A	39.5	-120.17
49.9	1963-07-08	3.5	N/A	40.2	-121

Historical Tornado Events

No historical tornado events that had recorded magnitudes of 2 or above found in or near Sierra County.

No historical earthquake events found in or near Sierra County.

* The information on this page is based on the global volcano database, the U.S. earthquake database of 1638-1985, and the U.S. Tornado and Weather Extremes database of 1950-2010.