Earthquake near La Crescenta-Montrose, CA

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. 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: La Cañada Flintridge, Altadena, Pasadena, Burbank, Glendale, Sierra Madre.

How big was it?

This earthquake released about 0.32 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.7 would have released about 32 times as much.

1. Mineral, Virginia 2011 M 5.8 48,000,000× the energy of this one
2. Magna, Utah 2020 M 5.7 34,000,000× the energy of this one
3. Around the size people start to feel M 3.0 3,000× the energy of this one
4. This earthquake M 0.7 about 0.32 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 2020-09-19 — about 620,000 times the energy of this one.

Before 2016, the USGS record lists 23 earthquakes of M5 or more within 50 km; the five largest:

1. 6.7 Northridge, California, earthquake · 33 km WSW of this epicentre Jan 17, 1994
2. 6.6 1971 San Fernando Earthquake, California · 23 km NW of this epicentre Feb 9, 1971
3. 5.9 The 1987 Whittier Narrows, California Earthquake · 26 km SSE of this epicentre Oct 1, 1987
4. 5.9 1km ENE of Granada Hills, California · 28 km W of this epicentre Jan 17, 1994
5. 5.8 10km SSW of Agua Dulce, CA · 23 km NW of this epicentre Feb 9, 1971

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 34.2763, -118.1837. Map © OpenStreetMap contributors.

Nearby places

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

Aftershocks so far

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

1. 1.6 1 km ESE of Baldwin Hills, CA 01:53 UTC
2. 1.7 2 km E of Granada Hills, CA 02:06 UTC
3. 1.1 2 km W of Chatsworth, CA 17:41 UTC
4. 0.6 3 km SSW of Charter Oak, CA 17:26 UTC
5. 1.5 1 km SSW of Chatsworth, CA 02:22 UTC
6. 0.8 10 km N of Azusa, CA 06:33 UTC
7. 1.4 1 km W of Chatsworth, CA 22:50 UTC
8. 2.3 0 km SSE of Chatsworth, CA 17:45 UTC
9. 1.4 1 km S of Chatsworth, CA 12:37 UTC
10. 1.1 2 km NW of Universal City, CA 09:44 UTC
11. 0.5 2 km ENE of South El Monte, CA 09:28 UTC
12. 1.3 3 km WNW of La Mirada, CA 03:01 UTC
13. 0.9 5 km SW of Pinon Hills, CA 16:52 UTC
14. 1.1 6 km NNW of Azusa, CA 20:26 UTC
15. 1.2 6 km NNE of Azusa, CA 23:06 UTC

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of 09:48 UTC. QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

Revisions

USGS refines a solution as more stations report. Every change we have seen is listed here.

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.