QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

Earthquake near San Jose, CA

No earthquake was likely felt in San Jose in the 24 hours to 5:01 pm PST (01:01 UTC). The last one was M 2.6, 19 km (12 mi) E, at 12:38 pm PDT on 27 October 2026, estimated intensity II (weak) in town; 8 felt reports to USGS. Every earthquake near San Jose

This page: a magnitude 1.8 earthquake was recorded 20 km (13 mi) east-southeast of San Jose, CA, at 7:17 pm PDT on 30 March 2017 (02:17 UTC), 1.6 km deep.

USGS: 14 km E of Seven Trees, California

12 km (8 mi) E of San Jose, CA

7:17 pm PDT, Mar 30, 2017 · · 1.6 km deep · released about 17 lb of TNT

Every earthquake near San Jose Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Clara County 8 kmSanta Cruz County 43 kmAlameda County 45 kmSan Mateo County 63 kmStanislaus County 67 kmContra Costa County 74 kmSan Joaquin County 80 kmMerced County 85 kmSan Benito County 92 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
7:17 pm PDT on 30 March 2017 ()
Where
20 km (13 mi) east-southeast of San Jose, CA · earthquakes near San Jose
Magnitude
M 1.8 (md)
Depth
1.6 km below the surface
Felt
no reports yet
Nearest
Santa Clara County, 8 km S
Nearest mapped fault
Calaveras fault, under 1 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 3512 days ago

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 14 km (9 mi) from the epicentre. In San Jose, 20 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: East Foothills, Morgan Hill, San Martin, Campbell, Milpitas, Santa Clara.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 lists 24 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.9 The 1989 Loma Prieta, California Earthquake · 34 km SSW of this epicentre
  2. 6.5 Near Morgan Hill, California · 20 km S of this epicentre
  3. 6.2 Near San Jose, California · 11 km W of this epicentre
  4. 6.2 The 1984 Morgan Hill, California Earthquake · 2 km N of this epicentre
  5. 6.1 Near San Jose, California · 15 km SW 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 37.2912, -121.6752. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Santa Clara County, CA 8 km (5 mi) S earthquakes near Santa Clara County
Santa Cruz County, CA 43 km (27 mi) SW earthquakes near Santa Cruz County
Alameda County, CA 45 km (28 mi) NNW earthquakes near Alameda County
San Mateo County, CA 63 km (39 mi) WNW earthquakes near San Mateo County
Stanislaus County, CA 67 km (41 mi) ENE earthquakes near Stanislaus County
Contra Costa County, CA 74 km (46 mi) NNW earthquakes near Contra Costa County

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

Aftershocks so far

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

  1. 1.5 Northern California
  2. 2.5 5 km SSW of Gilroy, California
  3. 2.3 2 km N of Union City, California
  4. 1.7 3 km S of Loyola, California
  5. 2.3 3 km ESE of Aromas, California
  6. 2.2 3 km ESE of Aromas, California
  7. 2.5 11 km ESE of Gilroy, California
  8. 1.6 5 km SSW of Gilroy, California
  9. 1.8 9km E of Gilroy, CA
  10. 2.5 6 km NNE of East Foothills, California
  11. 1.8 8 km SE of Livermore, California
  12. 2.1 1 km SSE of Livermore, California
  13. 2.6 2 km SSE of Livermore, California
  14. 1.9 1 km SSE of Livermore, California
  15. 1.6 Northern California

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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.