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Contra Costa County Natural Disasters and Weather Extremes

 
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The chance of earthquake damage in Contra Costa County is much higher than California average and is much higher than the national average. The risk of tornado damage in Contra Costa County is about the same as California average and is much lower than the national average.

Topics:Earthquake IndexVolcano IndexTornado IndexOther Weather Extremes EventsVolcanos NearbyHistorical Earthquake EventsHistorical Tornado Events

Earthquake Index, #4

Contra Costa County
41.60
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, #41

Contra Costa County
0.0015
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, #14

Contra Costa County
13.02
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 746 other weather extremes events within 50 miles of Contra Costa County were recorded from 1950 to 2010. The following is a break down of these events:

TypeCountTypeCountTypeCountTypeCountTypeCount
Avalanche:0Blizzard:1Cold:0Dense Fog:9Drought:0
Dust Storm:0Flood:252Hail:45Heat:2Heavy Snow:2
High Surf:2Hurricane:0Ice Storm:0Landslide:0Strong Wind:51
Thunderstorm Winds:48Tropical Storm:0Wildfire:15Winter Storm:4Winter Weather:0
Other:315 

Volcanos Nearby

A total of 1 volcano is found in or near Contra Costa County.

Distance (miles)NameRegionLatitudeLongitudeElevation (foot)TypeStatusLast Eruption
85.0Clear LakeUS-California, United States38.97-122.771439Volcanic fieldHoloceneUndated, but probable Holocene eruption

Historical Earthquake Events

A total of 145 historical earthquake events that had recorded magnitudes of 3.5 or above found in or near Contra Costa County.

Distance (miles)DateMagnitudeDepth (km)LatitudeLongitude
47.51911-07-016.6N/A37.25-121.75
43.61984-04-246.2837.32-121.7
10.81980-01-245.8837.83-121.79
39.11955-09-055.8N/A37.37-121.78
36.81943-10-265.5N/A37.4-121.8
6.41955-10-245.4N/A37.97-122.05
17.61980-01-275.41037.75-121.71
13.31980-01-245.1337.8-121.76
6.21965-09-104.8N/A38-121.9
9.91980-01-244.8137.84-121.8
39.31981-01-154.8937.38-121.72
45.31979-05-084.8637.3-121.68
13.71984-03-274.7737.76-122.1
35.61958-12-114.7N/A37.68-122.53
47.71973-09-174.7238.6-122.1
48.61973-10-034.7837.28-121.58
25.21977-06-214.61037.65-121.64
25.61977-06-214.61037.65-121.63
44.91963-05-224.6N/A37.3-122.2
15.91937-03-084.5N/A37.8-122.2
17.11952-10-134.5N/A37.75-122.18
40.71945-08-274.5N/A37.33-121.92
47.41963-09-214.5N/A37.27-121.67
49.71933-12-134.5N/A37.2-122
49.71973-11-124.51437.2-122
49.81973-11-124.51437.2-122.01
24.81981-03-034.41037.56-121.94
33.01957-03-224.4N/A37.65-122.45
33.41979-04-284.41337.65-122.46
41.81984-09-264.4637.34-121.73
46.11984-05-034.41037.29-121.67
49.81978-09-084.41738.64-121.91
8.31970-06-124.3937.8-121.93
40.81963-08-044.3N/A37.6-122.58
7.61970-06-124.2937.81-121.94
9.61980-01-254.2537.85-121.8
10.41980-01-254.2337.84-121.79
11.21980-01-254.2637.83-121.78
22.21963-05-204.2N/A37.6-121.9
30.11958-10-314.2N/A37.5-121.8
34.51957-03-234.2N/A37.7-122.52
48.61984-06-054.2637.27-121.61
4.31958-05-314.1N/A37.87-122
9.91980-01-274.1837.84-121.8
10.51962-03-174.1N/A37.87-121.77
15.91984-03-184.11037.78-121.72
24.21943-04-264.1N/A37.63-121.7
27.21943-04-294.1N/A37.56-121.75
40.71978-08-294.1837.36-121.72
42.01957-10-314.1N/A37.35-122.22
46.61959-03-244.1N/A37.27-121.72
47.31954-04-104.1N/A37.25-121.77
48.71958-07-094.1N/A37.25-121.67
9.01976-08-204737.79-121.97
9.91963-06-074N/A38-121.8
12.51977-01-0841037.9-122.18
13.11980-01-244237.83-121.74
28.91980-08-244537.57-121.66
34.31957-03-234N/A37.65-122.48
36.01941-09-184N/A37.4-122
46.81932-06-144N/A37.25-122.08
2.71961-08-183.9N/A37.93-122
10.11960-12-153.9N/A38.03-121.83
11.21976-08-203.9237.76-121.91
17.31951-07-243.9N/A37.92-122.27
32.51982-08-243.9637.46-121.82
47.61967-05-303.9N/A37.27-121.66
5.51961-11-173.8N/A37.97-122.03
8.21970-05-263.8437.8-121.95
9.41969-03-133.8N/A38.03-121.85
11.51982-08-283.81237.85-121.76
13.61977-01-083.8937.9-122.2
14.11948-01-143.8N/A37.87-121.7
16.31983-06-043.8637.72-122.11
16.71969-12-293.8N/A37.77-121.71
19.41977-06-043.82638.2-121.97
23.51954-12-173.8N/A37.6-122.1
27.31954-12-173.8N/A37.55-122.13
33.11957-03-223.8N/A37.67-122.47
33.61957-03-223.8N/A37.67-122.48
33.61957-03-233.8N/A37.67-122.48
39.41978-05-113.8337.37-121.76
41.31978-08-293.8737.35-121.72
42.61984-12-283.8637.33-121.72
45.91962-06-073.8N/A37.28-121.72
4.41979-07-103.71737.86-121.98
10.11966-02-103.7N/A37.89-121.77
12.61976-07-133.71038.09-121.87
13.41979-06-173.71638.1-122.04
16.61962-01-243.7N/A37.87-122.25
20.81977-09-053.7838.19-122.12
23.21980-02-213.7637.66-121.68
29.71965-06-283.7N/A37.52-121.75
33.21948-07-203.7N/A37.45-121.82
38.81978-05-113.7437.38-121.75
39.01950-09-083.7N/A37.44-122.33
41.11981-12-123.7937.38-122.27
42.81966-06-063.7N/A37.32-121.75
43.41970-01-033.7637.3-122.09
43.91959-06-113.7N/A37.33-121.65
46.81984-08-133.7937.28-121.67
3.51948-01-313.6N/A37.97-121.95
5.71942-08-143.6N/A37.98-121.88
12.51970-08-313.6838.1-121.94
13.31943-11-163.6N/A37.78-122.12
14.21980-01-293.6937.79-121.75
15.91961-02-163.6N/A37.83-122.22
33.21957-03-223.6N/A37.68-122.48
35.91948-04-183.6N/A38.17-122.53
36.81973-12-293.6737.4-121.8
38.21979-01-113.6137.39-121.75
41.91983-05-193.6637.33-121.77
43.11983-10-233.6737.33-121.69
45.21984-10-313.6837.31-121.65
48.21984-08-163.6637.26-121.66
48.41984-08-243.6637.26-121.65
7.61970-05-263.5437.81-121.94
7.71983-06-053.51338.01-121.87
8.31970-05-293.5737.8-121.94
9.31977-07-193.5238.05-121.99
9.51980-01-243.5937.84-121.81
11.71979-02-213.51237.83-121.77
12.61979-08-133.5937.86-122.17
12.81954-02-083.5N/A37.8-122.13
16.11980-04-073.5537.84-122.23
17.31961-06-273.5N/A37.8-122.23
17.71980-12-313.51037.7-122.12
18.01977-06-173.52238.18-121.93
24.31965-01-293.5N/A37.7-122.3
26.01966-07-193.5N/A37.65-121.62
31.41943-09-263.5N/A37.5-121.73
32.91985-09-243.5837.49-121.69
34.61976-07-073.51037.44-121.77
35.91961-10-193.5N/A37.42-121.77
36.01976-09-053.5937.6-121.43
36.81959-05-093.5N/A37.61-122.5
38.71984-07-313.5637.38-121.76
38.81970-09-233.51137.4-122.22
40.01962-04-073.5N/A37.37-121.72
43.01977-12-123.5737.33-121.7
43.61977-07-273.51137.31-122.16
45.11984-05-173.5637.3-121.69
47.41971-10-133.51038.33-122.65
47.41985-07-153.5737.27-121.67
47.61984-07-293.5737.27-121.66

Historical Tornado Events

A total of 2 historical tornado events that had recorded magnitude of 2 or above found in or near Contra Costa County.

Distance (miles)DateMagnitudeStart Lat/LogEnd Lat/LogLengthWidthFatalitiesInjuriesProperty DamageCrop DamageAffected County
37.11951-01-11237°22'N / 122°07'W37°25'N / 122°02'W5.70 Miles33 Yards002.5M0Santa Clara
38.41998-05-05237°22'N / 122°02'W37°22'N / 122°02'W0.60 Mile100 Yards013.8M0Santa Clara
 Brief Description: A Tornado touched down in the Chevy Chase residential area of Sunnyvale, CA near Hwy 85. The storm survey assessed the Damage to 15 home and a large chucrch as a mininimal F2.. One woman was injured when struck by flying debris. The storm was well documented on a video shot by a person from their backyard. The storm appears to be rotating anticyclonically from this video. This storm apparently developed from thunderstorms that developed in the lee of the Santa Cruz mountains over the W Santa Clara Valley.


* 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.


 
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