QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

Earthquake near Paso Robles, CA

No earthquake was likely felt in Paso Robles in the 24 hours to 8:33 am PST (16:33 UTC). The last one was M 2.5, 21 km (13 mi) S, at 11:41 pm PDT on 15 August 2026, estimated intensity II (weak) in town; 61 felt reports to USGS. Every earthquake near Paso Robles

This page: a magnitude 1.7 earthquake was recorded 36 km (22 mi) northeast of Paso Robles, CA, at 10:25 pm PDT on 10 September 2020 (05:25 UTC), 6.0 km deep.

USGS: 10km SSE of Parkfield, CA

10:25 pm PDT, Sep 10, 2020 · · 6.0 km deep · released about 10 lb of TNT

Every earthquake near Paso Robles Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 49 kmKings County 58 kmMonterey County 96 kmSan Benito County 108 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
10:25 pm PDT on 10 September 2020 ()
Where
36 km (22 mi) northeast of Paso Robles, CA · earthquakes near Paso Robles
Magnitude
M 1.7 (md)
Depth
6.0 km below the surface
Felt
no reports yet
Nearest
San Luis Obispo County, 49 km S
Nearest mapped fault
San Andreas fault, 1 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 2243 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 11 km (7 mi) from the epicentre. In Paso Robles, 36 km away, the estimate is intensity I (not felt). 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.

Earthquakes near other towns within 30 km: Shandon, San Miguel, Avenal.

How big was it?

This earthquake released about 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 8,200 times the energy of this one.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 The 1983 Coalinga, California Earthquake · 46 km N of this epicentre
  2. 6.5 1922 Parkfield, California Earthquake · 14 km SE of this epicentre
  3. 6.4 1901 Parkfield, California Earthquake · 23 km NNW of this epicentre
  4. 6.0 2004 Parkfield, California Earthquake · 1 km SE of this epicentre
  5. 5.8 1934 Parkfield, California Earthquake · 26 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 35.8233, -120.3758. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
San Luis Obispo County, CA 49 km (30 mi) S earthquakes near San Luis Obispo County
Kings County, CA 58 km (36 mi) ENE earthquakes near Kings County
Monterey County, CA 96 km (60 mi) WNW earthquakes near Monterey County
San Benito County, CA 108 km (67 mi) NW earthquakes near San Benito County
Fresno County, CA 123 km (76 mi) NNE earthquakes near Fresno County

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

Aftershocks so far

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

  1. 2.7 10km W of Templeton, CA
  2. 1.6 9km NNW of Cholame, CA
  3. 1.8 9km SSE of Huron, CA
  4. 1.7 12km SW of Huron, CA
  5. 1.9 4km SW of Avenal, CA
  6. 1.7 21km NW of Parkfield, CA
  7. 1.7 9km W of Templeton, CA
  8. 1.7 16km SSE of Shandon, CA
  9. 2.4 5km NW of Parkfield, CA
  10. 2.5 23km NW of Parkfield, CA
  11. 1.8 6km E of Atascadero, CA
  12. 1.6 22km S of Kettleman City, CA
  13. 2.3 20km NW of Parkfield, CA
  14. 2.0 10km NNW of Avenal, CA
  15. 1.6 23km ENE of San Ardo, 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.