The April 26, 1986 earthquake
M5.0near Hana, Hawaii
A magnitude 5.0 earthquake 1.6 miles deep, 23.7 miles off Maui County. The 84th strongest in Hawaii’s record since 1900, and the strongest within 50 miles since a magnitude 5.1 on February 20, 1976. 5 aftershocks of magnitude 2.5 or more followed within 30 days.
The earthquake
- Magnitude
- 5.0
- local magnitude (ml)
- Depth
- 1.6 mi
- 2.6 km below the surface
- Local time
- Saturday, April 26, 1986
- 07:19 HST; 17:19 UTC
- In Hawaii’s record
- 84th
- strongest of 39,637 since 1900
USGS ANSS Comprehensive Earthquake Catalog, event hv213029 (“39 km ENE of Hana, Hawaii”). The USGS event page carries the ShakeMap, felt reports and the official summary.
Aftershocks
Earthquakes of magnitude 2.5 or more within 20 miles of the epicentre in the 30 days after.
5
Aftershocks in 30 days
3.1
Largest aftershock, Apr 27, 1986
3
On the first day
0
In the 7 days before
- The search radius is the surface rupture length expected for an earthquake of this magnitude (Wells and Coppersmith, 1994), at least 20 and at most 600 miles, so a great earthquake's sequence is counted along its whole fault.
Counties and cities within 50 miles
Distance from the epicentre to each county boundary (zero when inside) and to each city centre.
Counties
- Maui CountyHI · 23.7 mi
- Hawaii CountyHI · 42.8 mi
Earthquakes around the epicentre
114 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.
Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first
- January 22, 1938M6.6
- March 20, 1927M6.0
- March 19, 1926M6.0
- September 25, 1929M5.8
- June 4, 1904M5.6
- September 1, 1940M5.6
- July 15, 1940M5.6
- February 20, 1976M5.1
- October 13, 1912M5.0
USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.