M4.2 Earthquake near San Ramon, CA — 02 February 2026
A light earthquake of magnitude 4.2 was recorded near San Ramon, CA on , with an epicentre 4 km east-southeast of San Ramon, at a focal depth of 9.4 km.
Time (UTC): 2026-02-02 15:01:13
Time (your timezone): —
Magnitude: 4.2 (light)
Focal depth: 9.4 km (shallow)
Epicentre: 37.7598, -121.9370
Location: 4 km ESE of San Ramon, CA
USGS link to NOAA tsunami information: Available
Review status: Reviewed
Source: USGS event page
How strong was this earthquake?
Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items.
A magnitude 4.2 earthquake radiates roughly 28 tons of TNT equivalent in seismic energy.
The USGS assigns this earthquake a significance score of 749, which meets the USGS threshold of more than 600 for its significant-earthquake list. The ranking combines magnitude with available Did You Feel It responses and PAGER alert level; it is not a direct measurement of damage.
Where was the epicentre?
The epicentre was located at 37.7598, -121.9370 — 4 km east-southeast of San Ramon. The closest other recorded event was a magnitude 1.6 earthquake 35 km west-northwest of here on 01 August 2026.
Why the 9 km depth matters
At 9 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.
What does the tsunami information flag mean?
The USGS event record links to NOAA tsunami information because this was a large event in an oceanic region. That link flag does not mean a tsunami occurred or that a warning is active. Check tsunami.gov and instructions from your local authority for the current status of your coastline.
How earthquakes generate tsunamis, and what the alert levels mean →
Aftershocks and local seismic history
449 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.8.
20 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.6 event near Redwood Valley on 24 June 2026. This M4.2 event released about 130 times less energy than that event.
How long aftershock sequences last, and how large they get →
Where this event sits in the record
This earthquake is part of the February 2026 worldwide record. Browse the full monthly archive to compare periods.
Nearest recorded earthquakes to this epicentre
- M1.6 earthquake near Albany, CA — (35 km WNW)
- M2.3 earthquake near Gilroy, CA — (98 km SSE)
- M1.0 earthquake near Larkfield-Wikiup, CA — (109 km NW)
- M0.2 earthquake near The Geysers, CA — (136 km NNW)
- M1.3 earthquake near The Geysers, CA — (138 km NNW)
- M1.3 earthquake near The Geysers, CA — (139 km NNW)
- M1.3 earthquake near The Geysers, CA — (140 km NNW)
- M0.7 earthquake near The Geysers, CA — (141 km NNW)
- M0.7 earthquake near The Geysers, CA — (141 km NNW)
- M1.0 earthquake near Cobb, CA — (141 km NNW)
Other magnitude 4 earthquakes worldwide
- M4.4 earthquake near El Arenal, Mexico —
- M4.3 earthquake near Puerto Madero, Mexico —
- M4.4 earthquake near Fiji region —
- M4.1 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M4.0 earthquake near Charlotte Amalie, U.S. Virgin Islands —
- M4.2 earthquake near Banda Sea —
- M4.4 earthquake near Ollagüe, Chile —
- M4.4 earthquake near Severo-Kuril’sk, Russia —
Questions about this earthquake
How strong is a magnitude 4.2 earthquake?
Light earthquakes are widely felt near the epicentre and can rattle windows, dishes and hanging objects. Damage is uncommon and usually limited to cracked plaster or fallen loose items. A magnitude 4.2 earthquake radiates roughly 28 tons of TNT equivalent in seismic energy.
How deep was the earthquake near San Ramon?
At 9 km this was a shallow earthquake. Shallow events release their energy close to the surface, so for a given magnitude they produce noticeably stronger shaking — and more damage — than deeper ones. Roughly three quarters of all earthquakes worldwide occur at shallow depths.
Was the M4.2 earthquake near San Ramon felt?
This catalogue does not ingest eyewitness responses, so it cannot confirm where this earthquake was felt. Based on magnitude alone, an event this size is often felt across the surrounding area. Its shallow focus makes stronger surface shaking more likely than for a deeper event of the same magnitude.
What does the USGS tsunami field mean for this event?
The USGS event record links to NOAA tsunami information because this was a large event in an oceanic region. That link flag does not mean a tsunami occurred or that a warning is active. Check tsunami.gov and instructions from your local authority for the current status of your coastline.
Have there been aftershocks?
449 further earthquakes have been recorded within about 150 km of the epicentre in the seven days after this event, the largest of them magnitude 3.8.
How often do earthquakes happen near San Ramon?
20 earthquakes of magnitude 4 or above have been logged within roughly 200 km of this epicentre in our catalogue. The strongest was a magnitude 5.6 event near Redwood Valley on 24 June 2026. This M4.2 event released about 130 times less energy than that event.