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Major magnitude 6.8 earthquake - 1.6 mi west of Hemet, Riverside County, California, USA, on Sunday, April 21, 1918 at 22:32 GMT

Major magnitude 6.8 earthquake at 0 km depth

Earthquake details

Date & time	Apr 21, 1918 22:32:25 UTC
Local time at epicenter
Status	Confirmed
Magnitude	6.8
Depth	0.0 km
Epicenter latitude / longitude	33.75°N / 117°W (Riverside, California, United States)
Antipode	33.75°S / 63°E
Shaking intensity	Severe shaking near epicenter
Felt	0 reports
Primary data source	USGS (United States Geological Survey)
Nearest volcano	Lavic Lake (116 km / 72 mi)
Nearby towns and cities	3 km (2 mi) W of Hemet (pop: 83,900) \| Show on map \| Quakes nearby 5 km (3 mi) SW of San Jacinto (pop: 47,000) \| Show on map \| Quakes nearby 6 km (4 mi) W of East Hemet (pop: 17,400) \| Show on map \| Quakes nearby 14 km (9 mi) E of Menifee (pop: 87,200) \| Show on map \| Quakes nearby 21 km (13 mi) E of Perris (pop: 75,000) \| Show on map \| Quakes nearby 29 km (18 mi) NE of Murrieta (pop: 109,800) \| Show on map \| Quakes nearby 30 km (19 mi) SE of Moreno Valley (pop: 204,200) \| Show on map \| Quakes nearby 116 km (72 mi) N of San Diego (pop: 1,394,900) \| Show on map \| Quakes nearby 120 km (74 mi) ESE of Los Angeles (pop: 3,971,900) \| Show on map \| Quakes nearby 672 km (417 mi) SE of Sacramento (pop: 490,700) \| Show on map \| Quakes nearby
Weather at epicenter at time of quake
Estimated seismic energy released	1 x 10¹⁵ joules (278 gigawatt hours, equivalent to 2.4 x 10⁵ tons of TNT or 14.9 atomic bombs!) \| about seismic energy

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Data for the same earthquake reported by different agencies

Info: The more agencies report about the same quake and post similar data, the more confidence you can have in the data. It takes normally up to a few hours until earthquake parameters are calculated with near-optimum precision.

Mag.	Depth	Location	Source
6.8	0 km	Southern California (USA)	USGS

Note: for quakes of 2012 and earlier, our database often contains only records from USGS.

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User reports for this quake

User reports estimate the perceived ground shaking intensity according to the MMI (Modified Mercalli Intensity) scale.

There are no user reports for this quake.

Aftershocks

[More info]

Recorded aftershocks, latest first (1 quake)

Date and time	Mag Depth	Location	Details
Jun 6, 1918 22:32 105 years ago	5.0 0 km	2.6 mi NW of San Jacinto, Riverside County, California, USA	More

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