Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Onset, MA
No earthquake was likely felt in Onset in the 24 hours to 4:37 am EST (09:37 UTC). The last one was M 3.8, 147 km (92 mi) N, at 10:22 am EST on 27 January 2025, estimated intensity II (weak) in town; 42,440 felt reports to USGS. Every earthquake near Onset
This page: a magnitude 1.7 earthquake was recorded in Onset, MA, at 1:31 am EDT on 21 August 2019 (05:31 UTC), 6.2 km deep. 11 people have reported feeling it to USGS.
USGS: 0 km S of Onset, Massachusetts
73 km (45 mi) SSE of Boston, MA · 25 km (15 mi) ENE of New Bedford, MA
- When
- 1:31 am EDT on 21 August 2019 ()
- Where
- in Onset, MA · earthquakes near Onset
- Massachusetts today
- every earthquake in Massachusetts in the last 24 hours
- Magnitude
- M 1.7 (ml)
- Depth
- 6.2 km below the surface
- Felt
- 11 reports · strongest reported intensity III
- Nearest
- Plymouth County, 29 km NNW
- Status
- Reviewed by a seismologist
USGS · last changed by USGS · we first saw it 2560 days ago
Earthquake alerts for Onset, MA
Get a notification in this browser when USGS records an earthquake near Onset, MA. 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 11 km (7 mi) from the epicentre. 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: Buzzards Bay, Monument Beach, Bourne, Weweantic, Wareham Center, Pocasset.
How big was it?
This earthquake released about 11 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 1,400,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
- Around the size people start to feel M 3.0 89× the energy of this one
- This earthquake M 1.7 about 11 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 41.7371, -70.6587. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Plymouth County, MA | 29 km (18 mi) | NNW | earthquakes near Plymouth County |
| Bristol County, MA | 36 km (22 mi) | W | earthquakes near Bristol County |
| Dukes County, MA | 40 km (25 mi) | S | earthquakes near Dukes County |
| Barnstable County, MA | 41 km (26 mi) | E | earthquakes near Barnstable County |
| Bristol County, RI | 52 km (32 mi) | W | earthquakes near Bristol County |
| Newport County, RI | 58 km (36 mi) | WSW | earthquakes near Newport County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
5 earthquakes have been recorded within 50 km since this one.
- 1.8 3 km ESE of Acushnet, Massachusetts
- 2.0 9 km SSW of Bliss Corner, Massachusetts
- 3.6 10 km S of Bliss Corner, Massachusetts
- 2.1 16 km ENE of Edgartown, Massachusetts
- 2.1 1 km W of North Plymouth, Massachusetts
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.