Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Idyllwild, CA
No earthquake was likely felt in Idyllwild in the 24 hours to 4:22 am PST (12:22 UTC). The last one was M 2.7, 19 km (12 mi) WNW, at 1:04 am PDT on 11 October 2026, estimated intensity II (weak) in town; 58 felt reports to USGS. Every earthquake near Idyllwild
This page: a magnitude 1.7 earthquake was recorded 8 km (5 mi) south-southwest of Idyllwild, CA, at 12:56 pm PDT on 29 October 2018 (19:56 UTC), 9.3 km deep.
USGS: 8km SSW of Idyllwild, CA
23 km (14 mi) ESE of Hemet, CA · 102 km (63 mi) NNE of San Diego, CA
- When
- 12:56 pm PDT on 29 October 2018 ()
- Where
- 8 km (5 mi) south-southwest of Idyllwild, CA · earthquakes near Idyllwild
- Magnitude
- M 1.7 (ml)
- Depth
- 9.3 km below the surface
- Felt
- no reports yet
- Nearest
- Riverside County, 70 km E
- Nearest mapped fault
- San Jacinto fault, 2 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 2936 days ago
Earthquake alerts for Idyllwild, 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 8 km (5 mi) from the epicentre. In Idyllwild, 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.
Earthquakes near other towns within 30 km: Idyllwild-Pine Cove, Valle Vista, Anza, East Hemet, Hemet, San Jacinto.
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 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 95× 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 5.2 on 2016-06-10 — about 180,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 22 km WNW of this epicentre
- 6.0 The 1986 North Palm Springs, California Earthquake · 39 km NNE of this epicentre
- 5.4 20km NNW of Borrego Springs, CA · 39 km SE of this epicentre
- 5.3 4km NNE of Desert Hot Springs, CA · 44 km NE of this epicentre
- 5.3 6km SSE of Hemet, CA · 17 km WNW 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 33.6725, -116.7592. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Riverside County, CA | 70 km (44 mi) | E | earthquakes near Riverside County |
| San Diego County, CA | 72 km (45 mi) | S | earthquakes near San Diego County |
| Orange County, CA | 94 km (59 mi) | W | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 2.1 8km S of Cabazon, CA
- 1.9 8km NE of Aguanga, CA
- 1.7 10km WNW of Palomar Observatory, CA
- 1.7 5km SSE of Banning, CA
- 2.4 7km ENE of Aguanga, CA
- 1.5 11km ENE of Desert Hot Springs, CA
- 1.7 7km NE of Aguanga, CA
- 1.7 8km NE of Aguanga, CA
- 1.5 10km NE of Aguanga, CA
- 1.6 2km NE of Banning, CA
- 1.8 9km NNW of Anza, CA
- 2.5 3km SW of Morongo Valley, CA
- 2.0 8km SE of Valle Vista, CA
- 2.1 8km NNE of Beaumont, CA
- 1.8 8km NE of Aguanga, 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.