19km ESE of Anza, CA

2016-05-05 02:27 UTC · 7.7 km deep · released about 17 lb of TNT

Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.

When: 2016-05-05 02:27 UTC
Magnitude: M 1.8 (ml)
Depth: 7.7 km below the surface
Felt: no reports yet
Nearest: Riverside County, 54 km ENE
Status: Reviewed by a seismologist

USGS · last changed by USGS 3784 days ago · we first saw it 3784 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
Magna, Utah 2020 M 5.7 640,000× the energy of this one
Around the size people start to feel M 3.0 57× the energy of this one
This earthquake M 1.8 about 17 lb of TNT

Energy from the Gutenberg–Richter relation (log₁₀E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Map loads when it scrolls into view

Epicentre 33.4728, -116.4938. Map © OpenStreetMap contributors.

Nearby places

Place	Distance	Direction
Riverside County, CA	54 km (33 mi)	WSW of here	earthquakes near Riverside County
San Diego County, CA	56 km (35 mi)	NNE of here	earthquakes near San Diego County
Imperial County, CA	116 km (72 mi)	WNW of here	earthquakes near Imperial County
Orange County, CA	121 km (75 mi)	E of here	earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

51 earthquakes have been recorded within 50 km since this one.

2.0 23km ESE of Anza, CA 08:11 UTC
1.7 22km ESE of Anza, CA 08:11 UTC
1.8 23km ESE of Anza, CA 08:11 UTC
1.9 23km ESE of Anza, CA 08:11 UTC
2.0 20km ESE of Anza, CA 08:11 UTC
1.8 24km ESE of Anza, CA 08:10 UTC
1.7 23km SSW of La Quinta, CA 08:10 UTC
2.3 20km NNW of Borrego Springs, CA 08:09 UTC
1.8 22km ESE of Anza, CA 08:09 UTC
2.0 23km ESE of Anza, CA 08:08 UTC
2.1 23km ESE of Anza, CA 08:08 UTC
2.3 24km ESE of Anza, CA 08:08 UTC
2.0 22km NNW of Borrego Springs, CA 08:08 UTC
2.3 23km ESE of Anza, CA 08:07 UTC
2.5 23km ESE of Anza, CA 08:07 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 10:43 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

The official USGS event page — the source of record for every value above
Did you feel it? Report it to USGS — reports go to USGS, not to us
ShakeMap for this event, when USGS has produced one

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.