Minor earthquake, 3.34 mag strikes near Boulder Creek in CA

A minor earthquake magnitude 3.34 (ml/mb) has struck on Thursday, 33 kilometers (21 miles) from Boulder Creek in CA. Global date and time of event UTC/GMT: 31/07/25 / 2025-07-31 04:28:00 / July 31, 2025 @ 4:28 am. The earthquake occurred at a depth of 13.659999847412 km (8 miles) below the earth’s surface. The temblor was reported at 04:28:00 / 4:28 am (local time epicenter). Exact location of earthquake, -122.48850250244° West, 37.168334960938° North, depth 13.659999847412 km. Event id: nc75217272. Ids that are associated to the earthquake: nc75217272.

Event epicenter was 56 km (35 miles) from San Jose (c. 945 900 pop), 68 km (42 miles) from San Francisco (c. 805 200 pop), 73 km (46 miles) from Oakland (c. 390 700 pop), 61 km (38 miles) from Fremont (c. 214 100 pop), 66 km (41 miles) from Hayward (c. 144 200 pop). Nearest cities/city/villages to epicentrum/hypocenter was Albany, Marina, San Ramon (min 5000 pop). Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected).

There are an estimated 130,000 minor earthquakes in the world each year. Earthquakes 3.0 to 4.0 are often felt, but only causes minor damage. In the past 24 hours, there have been one, in the last 10 days one, in the past 30 days three and in the last 365 days twenty-four earthquakes of magnitude 3.0 or greater that has occurred nearby.

Questions or comments?

How did you react? Was there any damage to buildings? Leave a comment or report about shaking, activity and damage at your home, city and country. Read more about the earthquake, Location, Distances, Seismometer information, Date-Time, Parameters and details about this quake, reported near: 33 km WNW of Boulder Creek, CA. This information comes from the USGS Earthquake Notification Service.

More information

Parameter	Value	Description
Magnitude	3.34 mb	The magnitude for the event.
Longitude	-122.48850250244° West	Decimal degrees longitude. Negative values for western longitudes.
Latitude	37.168334960938° North	Decimal degrees latitude. Negative values for southern latitudes.
Depth	13.659999847412 km	Depth of the event in kilometers.
Place	33 km WNW of Boulder Creek, CA	Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time	2025-07-31 04:28:00	Time when the event occurred. UTC/GMT
Updated	2025-07-31 04:31:10	Time when the event was most recently updated. UTC/GMT
Timezone offset		Timezone offset from UTC in minutes at the event epicenter.
Felt		The total number of felt reports
CDI		The maximum reported intensity for the event.
MMI		The maximum estimated instrumental intensity for the event.
Alert Level		The alert level from the PAGER earthquake impact scale. Green, Yellow, Orange or Red.
Review Status	reviewed	Indicates whether the event has been reviewed by a human.
Tsunami	0	This flag is set to "1" for large events in oceanic regions and "0" otherwise. The existence or value of this flag does not indicate if a tsunami actually did or will exist.
SIG	172	A number describing how significant the event is. Larger numbers indicate a more significant event.
Network	nc	The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources	,nc,	A comma-separated list of network contributors.
Number of Stations Used	66	The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance	0.1146	Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square	0.11 sec	The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap	219	The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type	ml	The method or algorithm used to calculate the preferred magnitude for the event.
Event Type	earthquake	Type of seismic event.
Event ID	nc75217272	Id of event.
Event Code	75217272	An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS	,nc75217272,	A comma-separated list of event ids that are associated to an event.

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Minor earthquake, 3.34 mag strikes near Boulder Creek in CA

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