Earthquake · reviewed by a seismologist
M 2.5ml
Earthquake near Lake Arrowhead, CA
No earthquake was likely felt in Lake Arrowhead in the 24 hours to 6:37 am PST (14:37 UTC). The last one was M 2.0, 11 km (7 mi) SSW, at 3:40 pm PDT on 22 September 2026, estimated intensity II (weak) in town; 14 felt reports to USGS. Every earthquake near Lake Arrowhead
This page: a magnitude 2.5 earthquake was recorded 2 km (1 mi) north-northeast of Lake Arrowhead, CA, at 12:58 pm PDT on 11 May 2020 (19:58 UTC), 6.5 km deep. 13 people have reported feeling it to USGS.
USGS: 2km NNE of Lake Arrowhead, CA
17 km (10 mi) N of Highland, CA · 117 km (73 mi) ENE of Los Angeles, CA
- When
- 12:58 pm PDT on 11 May 2020 ()
- Where
- 2 km (1 mi) north-northeast of Lake Arrowhead, CA · earthquakes near Lake Arrowhead
- Magnitude
- M 2.5 (ml)
- Depth
- 6.5 km below the surface
- Felt
- 13 reports · strongest reported intensity III
- Nearest
- Orange County, 86 km SW
- Nearest mapped fault
- Cleghorn 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 1726 days ago
Earthquake alerts for Lake Arrowhead, CA
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Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 21 km (13 mi) from the epicentre. In Lake Arrowhead, 2 km away, the estimate is intensity III (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: Lake Arrowhead 2 km, intensity III · Highland 15 km, intensity II · Muscoy 20 km, intensity II · San Bernardino 20 km, intensity II · Hesperia 21 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 160 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 95,000× the energy of this one
- Magna, Utah 2020 M 5.7 68,000× the energy of this one
- Around the size people start to feel M 3.0 6× the energy of this one
- This earthquake M 2.5 about 160 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 2018-05-08 — about 1,000 times the energy of this one.
Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:
- 6.3 The 1992 Big Bear, California Earthquake · 33 km ESE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 21 km SSW of this epicentre
- 5.6 7km ENE of Running Springs, CA · 13 km ESE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 50 km WSW of this epicentre
- 5.5 11km SSE of Big Bear Lake, California · 32 km ESE 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 34.2648, -117.1777. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 86 km (53 mi) | SW | earthquakes near Orange County |
| Los Angeles County, CA | 100 km (62 mi) | W | earthquakes near Los Angeles County |
| San Bernardino County, CA | 112 km (70 mi) | NE | earthquakes near San Bernardino County |
| Riverside County, CA | 124 km (77 mi) | ESE | earthquakes near Riverside 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.
- 2.8 6km SSE of Pedley, CA
- 1.9 10km N of Cabazon, CA
- 1.8 5km NNW of Fontana, CA
- 1.6 8km NNE of Banning, CA
- 1.6 1km E of Redlands, CA
- 1.5 8km NNE of Yucaipa, CA
- 2.0 3km ENE of Colton, CA
- 1.8 3 km ENE of Colton, CA
- 1.9 10 km NNW of Cabazon, CA
- 1.6 3 km W of Banning, CA
- 1.5 7km SSW of Lytle Creek, CA
- 1.7 6km SSW of Redlands, CA
- 1.7 2km SSE of Loma Linda, CA
- 2.5 4km WSW of Banning, CA
- 1.6 1km ESE of Redlands, 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.