QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Dana Point, CA

No earthquake was likely felt in Dana Point in the 24 hours to 8:45 am PST (16:45 UTC). The last one was M 3.5, 31 km (19 mi) SW, at 1:22 pm PDT on 5 October 2026, estimated intensity II (weak) in town; 126 felt reports to USGS. Every earthquake near Dana Point

This page: a magnitude 1.8 earthquake was recorded 4 km (2 mi) southeast of Dana Point, CA, at 3:25 am PDT on 23 March 2021 (10:25 UTC), 13 km deep.

USGS: 4km SE of Dana Point, CA

5 km (3 mi) W of San Clemente, CA · 94 km (58 mi) SE of Los Angeles, CA

3:25 am PDT, Mar 23, 2021 · · 13 km deep · released about 15 lb of TNT

Every earthquake near Dana Point Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 28 kmSan Diego County 95 kmLos Angeles County 100 km
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
3:25 am PDT on 23 March 2021 ()
Where
4 km (2 mi) southeast of Dana Point, CA · earthquakes near Dana Point
Magnitude
M 1.8 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Orange County, 28 km NNW
Nearest mapped fault
Newport-Inglewood-Rose Canyon fault, 4 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2060 days ago

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

At this magnitude and depth, people at rest would likely notice it out to about 4 km (2 mi) from the epicentre. In Dana Point, 4 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Dana Point 4 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 15 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.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 7 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 The 1933 Long Beach, California Earthquake · 37 km NW of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 38 km NE of this epicentre
  3. 5.3 7km W of Newport Beach, CA · 37 km WNW of this epicentre
  4. 5.2 8km ENE of Trabuco Canyon, CA · 32 km NNE of this epicentre
  5. 5.0 Near Lake Elsinore, California · 38 km NE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 33.4443, -117.6673. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 28 km (17 mi) NNW earthquakes near Orange County
San Diego County, CA 95 km (59 mi) ESE earthquakes near San Diego County
Los Angeles County, CA 100 km (62 mi) NNW earthquakes near Los Angeles County

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

Aftershocks so far

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

  1. 2.1 5km SSE of Home Gardens, CA
  2. 2.0 30km SW of Dana Point, CA
  3. 1.7 30km SW of Dana Point, CA
  4. 1.9 4km SE of Home Gardens, CA
  5. 1.7 4km SE of Home Gardens, CA
  6. 1.8 3km SSE of Garden Grove, CA
  7. 1.7 6km SSE of Home Gardens, CA
  8. 1.8 2km SE of Home Gardens, CA
  9. 1.5 2km WSW of Costa Mesa, CA
  10. 1.9 13km W of Carlsbad, CA
  11. 1.8 4km SE of Home Gardens, CA
  12. 1.6 22km SSW of Seal Beach, CA
  13. 1.7 5km ENE of Villa Park, CA
  14. 1.8 11km NNE of Trabuco Canyon, CA
  15. 1.7 8km E of Yorba Linda, CA

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

On USGS

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