»Alexander County

Earthquake Information for Alexander County, Illinois

Alexander County, IL has a moderate earthquake risk, with a total of 3 earthquakes since 1931. The USGS database shows that there is a 16.56% chance of a major earthquake within 50km of Alexander County, IL within the next 50 years. The largest earthquake within 30 miles of Alexander County, IL was a 4.7 Magnitude in 1990.

Risk Level:
Moderate

Total Number of Earthquakes in Alexander County since 1931

3

Probability of A 5.0 Earthquake within next 50 years

16.56%

Most Recent
Largest

4/25/2020 - 2.8 mag, 3.3mi depth 6 mi from Cairo, IL
4/6/2017 - 2.6 mag, 6.0mi depth 3 mi from Cairo, IL
2/26/2013 - 2.1 mag, 10.6mi depth 2 mi from Olive Branch, IL
2/15/1985 - 3.3 mag, 6.2mi depth 3 mi from Olive Branch, IL

2/15/1985 - 3.3 mag, 6.2mi depth 3 mi from Olive Branch, IL
4/25/2020 - 2.8 mag, 3.3mi depth 6 mi from Cairo, IL
4/6/2017 - 2.6 mag, 6.0mi depth 3 mi from Cairo, IL
2/26/2013 - 2.1 mag, 10.6mi depth 2 mi from Olive Branch, IL

View All

Earthquake Probability for Alexander County, IL

View the probability of a major earthquake within the next 50 years in Alexander County, IL.

Probability of Earthquakes Within the Next 50 Years For Magnitudes Between 5.0 and 9.2

(within 31 km/51 miles above magnitude)

5.0

16.56%

5.1

15.03%

5.2

15.03%

5.2

15.03%

5.3

13.79%

5.4

12.78%

5.5

11.95%

5.6

11.69%

5.7

11.08%

5.8

10.75%

5.9

10.31%

6.0

10.18%

6.1

9.79%

6.2

9.59%

6.3

9.31%

6.4

9.23%

6.5

9.02%

6.6

8.90%

6.7

8.84%

6.8

8.69%

6.9

8.61%

7.0

8.57%

7.1

7.95%

7.2

7.91%

7.3

7.89%

7.4

6.45%

7.5

3.62%

7.6

3.62%

7.7

1.30%

7.8

1.30%

7.9

0.71%

8.0

0.00%

8.1

0.00%

8.2

0.00%

8.3

0.00%

8.4

0.00%

8.5

0.00%

8.6

0.00%

8.7

0.00%

8.8

0.00%

8.9

0.00%

9.0

0.00%

9.1

0.00%

9.2

0.00%

Earthquake Count for Alexander County, IL

View the number of earthquake incidents in Alexander County, IL by year that are more than 2.5 Magnitude.

List of Earthquake Incidents for Alexander County, IL

Total Number of Earthquakes in Alexander County, IL within 30 miles. All distances and depths in the table are measured in miles.

Date

Magnitude

Depth

04/25/2020

2.8

3.3

Details

04/06/2017

2.6

6.0

Details

02/26/2013

2.1

10.6

Details

02/15/1985

3.3

6.2

Details

Risk Of Natural Disasters In Alexander County, IL

Radon Risk Low
Tornado Risk Very High
UV Index Risk Moderate

Earthquake Information for Alexander County, Illinois

Earthquake Probability for Alexander County, IL

Probability of Earthquakes Within the Next 50 Years For Magnitudes Between 5.0 and 9.2

Earthquake Count for Alexander County, IL

List of Earthquake Incidents for Alexander County, IL

Risk Of Natural Disasters In Alexander County, IL

Related Pages

Illinois Earthquakes by City