Earthquake · reviewed by a seismologist
M 1.5md
Earthquake near Templeton, CA
No earthquake was likely felt in Templeton in the 24 hours to 9:29 am PST (17:29 UTC). The last one was M 2.1, 13 km (8 mi) S, at 6:08 am PDT on 21 October 2026, estimated intensity II (weak) in town; 3 felt reports to USGS. Every earthquake near Templeton
This page: a magnitude 1.5 earthquake was recorded 4 km (3 mi) west-northwest of Templeton, CA, at 8:04 am PDT on 18 April 2023 (15:04 UTC), 5.7 km deep.
USGS: 4km WNW of Templeton, CA
75 km (47 mi) NNW of Santa Maria, CA
- When
- 8:04 am PDT on 18 April 2023 ()
- Where
- 4 km (3 mi) west-northwest of Templeton, CA · earthquakes near Templeton
- Magnitude
- M 1.5 (md)
- Depth
- 5.7 km below the surface
- Felt
- no reports yet
- Nearest
- San Luis Obispo County, 33 km SE
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 1304 days ago
Earthquake alerts for Templeton, CA
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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 9 km (6 mi) from the epicentre. In Templeton, 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: Paso Robles 9 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 5.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
- Around the size people start to feel M 3.0 170× the energy of this one
- This earthquake M 1.5 about 5.7 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 4.3 on 2019-12-17 — about 14,000 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 6.5 1922 Parkfield, California Earthquake · 50 km ENE of this epicentre
- 6.5 10 km NE of San Simeon, California · 35 km WNW of this epicentre
- 6.0 2004 Parkfield, California Earthquake · 45 km NE of this epicentre
- 5.8 1934 Parkfield, California Earthquake · 32 km NNE of this epicentre
- 5.7 Southwest of Cambria, California · 41 km W 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 35.5642, -120.7492. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Luis Obispo County, CA | 33 km (21 mi) | SE | earthquakes near San Luis Obispo County |
| Monterey County, CA | 91 km (56 mi) | NW | earthquakes near Monterey County |
| Kings County, CA | 101 km (63 mi) | NE | earthquakes near Kings County |
| San Benito County, CA | 120 km (75 mi) | NNW | earthquakes near San Benito County |
| Santa Barbara County, CA | 131 km (82 mi) | SSE | earthquakes near Santa Barbara County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 1.8 7 km NW of Parkfield, CA
- 2.3 5 km SSE of Parkfield, CA
- 1.6 14 km NNW of San Simeon, CA
- 2.4 8 km SE of Parkfield, CA
- 1.8 4 km NW of Parkfield, CA
- 2.0 13 km NW of Parkfield, CA
- 1.7 6 km NNW of Cholame, CA
- 1.9 10 km W of Atascadero, CA
- 1.8 6 km NW of Parkfield, CA
- 1.6 5 km NW of Parkfield, CA
- 2.0 6 km NW of Parkfield, CA
- 1.8 14 km N of San Simeon, CA
- 1.7 5 km ESE of Cholame, CA
- 2.6 12 km NW of Parkfield, CA
- 1.7 12 km NW of Parkfield, 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
- 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.