The March 28, 1915 earthquake

M6.4Kaoiki area, Hawaii

A magnitude 6.4 earthquake, centred in Hawaii County. The 9th strongest in Hawaii’s record since 1900, and the strongest within 50 miles since a magnitude 6.7 on September 20, 1908.

The earthquake

Magnitude
6.4
local magnitude (ml)
Depth
—
Not recorded
Local time
Sunday, March 28, 1915
08:26 HST; 18:56 UTC
Epicentre
19.43°N, 155.40°W
In Hawaii County
In Hawaii’s record
9th
strongest of 39,637 since 1900
Within 50 miles
1
county; more on this date

USGS ANSS Comprehensive Earthquake Catalog, event official19150328185600000 (“Kaoiki area, Hawaii”). The USGS event page carries the ShakeMap, felt reports and the official summary.

Counties and cities within 50 miles

Distance from the epicentre to each county boundary (zero when inside) and to each city centre.

Counties

Earthquakes around the epicentre

7,187 earthquakes of magnitude 3 or more within 50 miles of this epicentre since 1973.

Earthquakes of magnitude 3 or more within 50 miles of the epicentre, by year 1973: 115 1974: 198 1975: 505 1976: 292 1977: 218 1978: 141 1979: 172 1980: 184 1981: 175 1982: 159 1983: 159 1984: 82 1985: 64 1986: 60 1987: 57 1988: 61 1989: 54 1990: 64 1991: 57 1992: 53 1993: 24 1994: 22 1995: 18 1996: 244 1997: 108 1998: 159 1999: 68 2000: 20 2001: 28 2002: 13 2003: 25 2004: 24 2005: 32 2006: 35 2007: 37 2008: 21 2009: 21 2010: 21 2011: 42 2012: 39 2013: 33 2014: 23 2015: 51 2016: 62 2017: 48 2018: 2,132 2,132 2019: 61 2020: 123 2021: 160 2022: 213 2023: 130 2024: 216 2025: 64 19731978198319881993199820032008201320182023

Earlier earthquakes of magnitude 5 or more within 50 miles, strongest first

USGS ANSS Comprehensive Earthquake Catalog. Local time is the time zone of the county nearest the epicentre. Magnitudes are as the catalogue reports them.