Earthquakes by city United States 100 km

Seismic city profile

Earthquake in Ontario today

Ontario, United States: 480 earthquakes of magnitude 4.0+ detected within 100 km.

Population

171,214

Residents in the indexed city record.

Earthquakes

480

Earthquakes at M4.0+ nearby.

Max magnitude

6.7

Strongest recorded event in the current radius.

Timezone

America/Los_Angeles

Coordinates 34.063, -117.651

Nearby activity pulse

Last 30 days

Last 12 months

Last nearby event: 2025-07-31 16:32 UTC

Strongest nearby event

M 6.7

Santa Clarita, United States

1994-01-17 12:30 UTC

Updated today

Earthquake in Ontario today

No earthquake of magnitude M4.0+ has been detected today within 100 km of Ontario.

No M4.0+ event has been observed in the last 30 days around Ontario.

The strongest earthquake recorded near Ontario reached magnitude 6.7 on 1994-01-17 12:30 UTC, near Santa Clarita.

Status today

No earthquake detected today

Strongest today

Was there an earthquake in Ontario today?

No earthquake of magnitude M4.0+ has been detected today within 100 km of Ontario.

When was the last earthquake near Ontario?

The last nearby earthquake was recorded on 2025-07-31 16:32 UTC.

What is the strongest earthquake recorded near Ontario?

The strongest earthquake recorded near Ontario reached magnitude 6.7 on 1994-01-17 12:30 UTC, near Santa Clarita.

Map

Earthquakes within 100 km of Ontario

The map centers on Ontario and highlights the most recent earthquakes detected within 100 km.

Average magnitude

4.5

Average depth

7.1 km

Timeline

Recent seismic activity

Latest 1 events shown

UTC	Magnitude	Region	Depth
2025-07-31 16:32	M 4.4	Riverside United States	5.3 km

Monthly profile

Recent monthly trend

2025-07 1 events

Historic snapshot

Earthquakes history

Strongest years

1994 M 6.7 max · 49 earthquakes 1918 M 6.7 max · 2 earthquakes 1971 M 6.6 max · 50 earthquakes 1933 M 6.4 max · 80 earthquakes 1992 M 6.3 max · 50 earthquakes

Year	Max magnitude	Earthquakes
2025	M 4.4	1
2024	M 4.4	5
2023	M 4.2	1
2021	M 4.3	2
2020	M 4.5	2
2018	M 4.5	2
2016	M 4.4	1
2015	M 4.4	2
2014	M 5.1	6
2013	M 4.1	1
2012	M 4.5	3
2011	M 4.2	2
2010	M 4.4	4
2009	M 4.7	3
2008	M 5.4	3
2007	M 4.7	4
2005	M 4.9	5
2004	M 4.2	1
2003	M 5.0	8
2002	M 4.8	2
2001	M 4.7	5
2000	M 4.4	2
1999	M 5.6	3
1998	M 4.8	7
1997	M 5.1	5
1996	M 4.1	1
1995	M 4.2	1
1994	M 6.7	49
1993	M 4.1	1
1992	M 6.3	50
1991	M 5.8	4
1990	M 5.5	5
1989	M 5.0	8
1988	M 5.0	6
1987	M 5.9	8
1986	M 6.0	9
1985	M 4.6	1
1984	M 4.2	1
1983	M 4.0	1
1982	M 4.4	2
1979	M 5.2	6
1978	M 4.3	2
1977	M 4.4	2
1976	M 4.5	3
1974	M 4.4	1
1973	M 4.5	1
1972	M 4.0	1
1971	M 6.6	50
1970	M 5.2	3
1969	M 4.4	3
1968	M 4.1	1
1967	M 4.1	1
1965	M 5.0	4
1963	M 5.3	2
1962	M 5.0	5
1961	M 4.6	6
1960	M 4.1	1
1956	M 4.7	5
1955	M 4.1	1
1954	M 4.1	2
1952	M 4.8	2
1951	M 4.1	1
1950	M 4.8	3
1948	M 4.6	1
1946	M 4.9	1
1945	M 4.3	2
1944	M 5.2	8
1943	M 5.3	5
1942	M 4.6	3
1941	M 5.1	3
1940	M 4.7	4
1939	M 4.5	2
1938	M 5.2	3
1937	M 4.4	2
1936	M 4.7	1
1935	M 4.9	9
1934	M 4.5	4
1933	M 6.4	80
1932	M 4.3	2
1930	M 5.3	3
1929	M 4.7	1
1927	M 5.3	1
1925	M 4.5	1
1923	M 6.2	1
1920	M 4.9	1
1918	M 6.7	2
1916	M 4.5	1
1911	M 4.5	1
1910	M 6.0	3
1907	M 5.3	1
1902	M 4.5	1