QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near King City, CA

No earthquake was likely felt in King City in the 24 hours to 8:19 am PST (16:19 UTC). The last one was M 2.5, 14 km (8 mi) E, at 4:39 pm PDT on 29 September 2026, estimated intensity II (weak) in town. Every earthquake near King City

This page: a magnitude 1.8 earthquake was recorded 31 km (19 mi) south-southwest of King City, CA, at 3:04 pm PDT on 28 March 2023 (22:04 UTC), 5.1 km deep.

USGS: 29km ESE of Lopez Point, CA

89 km (55 mi) SSE of Salinas, CA

3:04 pm PDT, Mar 28, 2023 · · 5.1 km deep · released about 13 lb of TNT

Every earthquake near King City Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monterey County 33 kmSan Benito County 75 kmSan Luis Obispo County 96 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
3:04 pm PDT on 28 March 2023 ()
Where
31 km (19 mi) south-southwest of King City, CA · earthquakes near King City
Magnitude
M 1.8 (md)
Depth
5.1 km below the surface
Felt
no reports yet
Nearest
Monterey County, 33 km N
Nearest mapped fault
San Gregorio fault, 18 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 1324 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 12 km (7 mi) from the epicentre. In King City, 31 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.

How big was it?

This earthquake released about 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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

The largest earthquake within 50 km since 2016 was M 4.7 on 2021-10-25 — about 22,000 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.5 10 km NE of San Simeon, California · 31 km SSE of this epicentre
  2. 6.2 28km NW of Cambria, CA · 26 km SSW of this epicentre
  3. 5.2 26km NNW of Lake Nacimiento, CA · 26 km E of this epicentre
  4. 5.2 25 km NW of San Simeon, California · 16 km SSW of this epicentre
  5. 5.2 22 km NW of San Simeon, California · 17 km SSW 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 35.9515, -121.2567. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Monterey County, CA 33 km (20 mi) N earthquakes near Monterey County
San Benito County, CA 75 km (47 mi) NNE earthquakes near San Benito County
San Luis Obispo County, CA 96 km (60 mi) SE earthquakes near San Luis Obispo County
Santa Cruz County, CA 136 km (84 mi) NNW earthquakes near Santa Cruz County

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

Aftershocks so far

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

  1. 1.5 10 km NNE of San Simeon, CA
  2. 1.5 20 km SSE of Lopez Point, CA
  3. 1.9 23 km NW of San Simeon, CA
  4. 1.6 7 km NE of San Simeon, CA
  5. 1.9 24 km NW of San Simeon, CA
  6. 1.8 20 km SSE of Lopez Point, CA
  7. 1.5 20 km SSE of Lopez Point, CA
  8. 1.5 21 km SSE of Lopez Point, CA
  9. 1.7 26 km N of Lopez Point, CA
  10. 2.0 19 km WNW of San Simeon, CA
  11. 2.4 21 km SSE of Lopez Point, CA
  12. 1.8 20 km SSE of Lopez Point, CA
  13. 1.5 18 km N of San Simeon, CA
  14. 1.6 28 km S of Lopez Point, CA
  15. 2.4 27 km S of Lopez Point, 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.