quarry blast · reviewed by a seismologist
M 1.6ml
Earthquake near Bonita, CA
USGS: 6km SE of Bonita, CA
in Chula Vista, CA
- When
- 2:03 pm PST on 1 March 2018 ()
- Where
- 6 km (4 mi) SE of Bonita, CA · earthquakes near Bonita
- Magnitude
- M 1.6 (ml)
- Depth
- -0.4 km below the surface
- Felt
- no reports yet
- Nearest
- San Diego County, 48 km NNE
- Nearest mapped fault
- Newport-Inglewood-Rose Canyon fault, 13 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 3137 days ago
A magnitude 1.6 earthquake was recorded 6 km (4 mi) SE of Bonita, CA, at 2:03 pm PST on 1 March 2018 (22:03 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: La Presa, Chula Vista, National City, Spring Valley, Imperial Beach, Jamul.
USGS catalogues this as quarry blast, not an earthquake.
How big was it?
This earthquake released about 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
- Around the size people start to feel M 3.0 140× the energy of this one
- This earthquake M 1.6 about 6.6 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.
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 32.6250, -116.9767. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Diego County, CA | 48 km (30 mi) | NNE | earthquakes near San Diego County |
| Orange County, CA | 139 km (86 mi) | NNW | earthquakes near Orange County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
31 earthquakes have been recorded within 50 km since this one.
- 1.6 17km SW of La Jolla, CA
- 1.6 5km W of Chula Vista, CA
- 1.9 13km WSW of Coronado, CA
- 1.6 4km NNE of Imperial Beach, CA
- 1.8 10km SSW of San Diego Country Estates, CA
- 1.5 13km WSW of Coronado, CA
- 1.9 14km SW of Rosarito, B.C., MX
- 1.6 2km ENE of San Ysidro, CA
- 1.6 25km ENE of Primo Tapia, B.C., MX
- 1.7 6km N of Lakeside, CA
- 1.6 6km SE of Bostonia, CA
- 1.7 7km NNW of Lakeside, CA
- 1.5 5km NE of Rancho San Diego, CA
- 1.7 6km NNW of Lakeside, CA
- 1.6 5km NE of Rancho San Diego, 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.