Earthquake · reviewed by a seismologist
M 1.7md
Earthquake near Hollister, CA
No earthquake was likely felt in Hollister in the 24 hours to 7:52 am PST (15:52 UTC). The last one was M 2.0, 14 km (9 mi) WSW, at 2:11 am PST on 11 November 2026, estimated intensity II (weak) in town. Every earthquake near Hollister
This page: a magnitude 1.7 earthquake was recorded 45 km (28 mi) southeast of Hollister, CA, at 2:45 am PST on 21 December 2018 (10:45 UTC), less than 1 km deep.
USGS: 17km NE of Pinnacles, CA
58 km (36 mi) E of Salinas, CA · 105 km (65 mi) SE of San Jose, CA
- When
- 2:45 am PST on 21 December 2018 ()
- Where
- 45 km (28 mi) southeast of Hollister, CA · earthquakes near Hollister
- Magnitude
- M 1.7 (md)
- Depth
- 0.6 km below the surface
- Felt
- no reports yet
- Nearest
- San Benito County, 9 km W
- Nearest mapped fault
- Ortigalita fault, 12 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 2883 days ago
Earthquake alerts for Hollister, CA
Get a notification in this browser when USGS records an earthquake near Hollister, CA. No account or email needed.
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 12 km (7 mi) from the epicentre. In Hollister, 45 km away, the estimate is intensity I (not felt). 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.
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 4.6 on 2017-11-13 — about 22,000 times the energy of this one.
Before 2016, the USGS record lists 15 earthquakes of M5 or more within 50 km; the five largest:
- 6.1 Northwest of Huron, California · 37 km ESE of this epicentre
- 5.9 10 km SE of Tres Pinos, California · 24 km WNW of this epicentre
- 5.8 Near Paicines, California · 24 km WNW of this epicentre
- 5.8 29 km NE of San Lucas, California · 41 km SSE of this epicentre
- 5.5 7 km SW of Hollister, California · 45 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 36.6250, -120.9888. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| San Benito County, CA | 9 km (5 mi) | W | earthquakes near San Benito County |
| Monterey County, CA | 52 km (32 mi) | SW | earthquakes near Monterey County |
| Merced County, CA | 68 km (42 mi) | NNE | earthquakes near Merced County |
| Santa Clara County, CA | 91 km (57 mi) | NW | earthquakes near Santa Clara County |
| Santa Cruz County, CA | 100 km (62 mi) | WNW | earthquakes near Santa Cruz County |
| Stanislaus County, CA | 104 km (65 mi) | N | earthquakes near Stanislaus 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.
- 2.7 16km SSE of Tres Pinos, CA
- 2.1 22km SW of New Idria, CA
- 1.9 17km SSE of Tres Pinos, CA
- 1.6 22km NE of San Lucas, CA
- 1.6 5km NNW of Pinnacles, CA
- 2.3 6km NNW of Pinnacles, CA
- 3.2 20km SW of New Idria, CA
- 2.1 12km S of Tres Pinos, CA
- 2.0 2km NNE of Pinnacles, CA
- 1.5 9km SSW of Tres Pinos, CA
- 1.9 11km SE of Pinnacles, CA
- 1.6 2km ENE of Pinnacles, CA
- 1.5 10km S of Tres Pinos, CA
- 1.9 2km N of Pinnacles, CA
- 1.5 23km NNE of San Lucas, 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.