QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

Earthquake near Redway, CA

No earthquake was likely felt in Redway in the 24 hours to 10:16 pm PST (06:16 UTC). The last one was M 5.0, 153 km (95 mi) WNW, at 8:56 pm PST on 4 November 2026, estimated intensity II (weak) in town; 145 felt reports to USGS. Every earthquake near Redway

This page: a magnitude 2.7 earthquake was recorded 8 km (5 mi) east-southeast of Redway, CA, at 6:57 pm PDT on 20 June 2020 (01:57 UTC), 22 km deep. 2 people have reported feeling it to USGS.

USGS: 8km ESE of Redway, CA

6:57 pm PDT, Jun 20, 2020 · · 22 km deep · released about 340 lb of TNT

Every earthquake near Redway Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Humboldt County 70 kmMendocino County 78 kmTrinity County 81 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
6:57 pm PDT on 20 June 2020 ()
Where
8 km (5 mi) east-southeast of Redway, CA · earthquakes near Redway
Magnitude
M 2.7 (md)
Depth
22 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Humboldt County, 70 km NNW
Nearest mapped fault
Bartlett Springs fault system, 15 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 2265 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 13 km (8 mi) from the epicentre. In Redway, 8 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: Redway 8 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 4.5 on 2016-08-28 — about 480 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.2 The 1992 Petrolia, California Earthquake · 49 km WNW of this epicentre
  2. 6.0 30 km SSW of Scotia, California · 50 km WNW of this epicentre
  3. 5.9 9 km S of Leggett, California · 35 km S of this epicentre
  4. 5.5 7 km ESE of Shelter Cove, California · 24 km WSW of this epicentre
  5. 5.3 18 km SSW of Scotia, California · 45 km NW 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 40.0920, -123.7412. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Humboldt County, CA 70 km (44 mi) NNW earthquakes near Humboldt County
Mendocino County, CA 78 km (48 mi) SSE earthquakes near Mendocino County
Trinity County, CA 81 km (51 mi) NE earthquakes near Trinity County
Glenn County, CA 127 km (79 mi) ESE earthquakes near Glenn County
Lake County, CA 139 km (86 mi) SE earthquakes near Lake County

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

Aftershocks so far

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

  1. 2.1 23km NNE of Redway, CA
  2. 3.7 30km NNE of Redway, CA
  3. 2.3 13km WNW of Covelo, CA
  4. 1.8 6km ESE of Redway, CA
  5. 2.0 20km NNE of Rockport, CA
  6. 2.2 21km NNE of Rockport, CA
  7. 2.3 20km NNE of Rockport, CA
  8. 2.8 21km NNE of Rockport, CA
  9. 2.8 21km NNE of Rockport, CA
  10. 2.2 12km WNW of Covelo, CA
  11. 2.7 12km WNW of Covelo, CA
  12. 2.1 34km NE of Redway, CA
  13. 1.7 12km WNW of Covelo, CA
  14. 1.7 12km NW of Covelo, CA
  15. 1.7 12km WNW of Covelo, 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.