quarry blast · reviewed by a seismologist
M 1.7ml
Earthquake near Meadowbrook, CA
No earthquake was likely felt in Meadowbrook in the 24 hours to 8:35 pm PST (04:35 UTC). The last one was M 3.2, 43 km (26 mi) NW, at 5:37 am PDT on 2 September 2026, estimated intensity II (weak) in town; 730 felt reports to USGS. Every earthquake near Meadowbrook
No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.7 quarry blast was recorded 5 km (3 mi) west of Meadowbrook, CA, at 10:44 am PDT on 1 May 2017 (17:44 UTC), less than 1 km deep.
USGS: 5 km W of Meadowbrook, California
in Lake Elsinore, CA · 104 km (65 mi) ESE of Los Angeles, CA
- When
- 10:44 am PDT on 1 May 2017 ()
- Where
- 5 km (3 mi) west of Meadowbrook, CA · earthquakes near Meadowbrook
- Magnitude
- M 1.7 (ml)
- Depth
- -0.5 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 41 km W
- Nearest mapped fault
- Elsinore fault, 5 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 3466 days ago
Earthquake alerts for Meadowbrook, CA
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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 12 km (7 mi) from the epicentre. In Meadowbrook, 5 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: Lake Elsinore 6 km, intensity II · Perris 12 km, intensity II. Estimated for each town centre; each link is that town's own record.
USGS catalogues this as quarry blast, not an earthquake.
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.
- Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 92× the energy of this one
- 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 4.4 on 2016-01-06 — about 11,000 times the energy of this one.
Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 34 km E of this epicentre
- 6.2 3 km SE of San Bernardino, California · 42 km N of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 6 km WSW of this epicentre
- 5.4 5km S of Chino Hills, CA · 47 km WNW of this epicentre
- 5.3 6km SSE of Hemet, CA · 37 km E 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 33.7188, -117.3387. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 41 km (25 mi) | W | earthquakes near Orange County |
| San Diego County, CA | 93 km (58 mi) | SE | earthquakes near San Diego County |
| Los Angeles County, CA | 100 km (62 mi) | WNW | earthquakes near Los Angeles County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
34 earthquakes have been recorded within 50 km since this one.
- 1.5 1km SSE of Loma Linda, CA
- 1.6 3km NNE of Moreno Valley, CA
- 1.9 6km SSW of Redlands, CA
- 1.5 6km SE of Home Gardens, CA
- 1.6 8km ESE of Valle Vista, CA
- 2.4 2km SE of Loma Linda, CA
- 2.5 7km E of Yorba Linda, CA
- 1.6 1km NW of Fontana, CA
- 1.5 7km NW of Banning, CA
- 1.9 7km NE of Beaumont, CA
- 1.6 1km NE of Loma Linda, CA
- 1.5 7km SSE of Home Gardens, CA
- 2.1 5km SSE of Banning, CA
- 2.0 2km ESE of Loma Linda, CA
- 1.5 0km SSW of Loma Linda, 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.