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Light earthquake, 4 mag was detected near Cobb in California

Posted by admin on April 4, 2025 0 Comments

Earthquake location 38.8077S, -122.8411WA light earthquake with magnitude 4 (ml/mb) was detected on Friday, 10 kilometers (6 miles) from Cobb in California. The 4-magnitude earthquake was detected at 06:31:49 / 6:31 am (local time epicenter). Exact location of event, longitude -122.8411 West, latitude 38.8077 North, depth = 9 km. Date and time of earthquake in UTC/GMT: 04/04/25 / 2025-04-04 06:31:49 / April 4, 2025 @ 6:31 am. A tsunami warning has not been issued (Does not indicate if a tsunami actually did or will exist). Event id: ew1743748310. Ids that are associated to the earthquake: ew1743748310. The earthquake was roughly at a depth of 9 km (6 miles).

Nearest city/cities or towns, with min 5000 pop, to epicentrum/hypocenter was Vacaville, Lucas Valley-Marinwood, American Canyon. Nearby country/countries, United States (c. 310 233 000 pop) (That might be effected). Earthquake epicenter was 42 km (26 miles) from Santa Rosa (c. 167 800 pop), 90 km (56 miles) from Vacaville (c. 92 400 pop), 75 km (46 miles) from Napa (c. 76 900 pop), 66 km (41 miles) from Petaluma (c. 57 900 pop), 81 km (51 miles) from Novato (c. 51 900 pop), 53 km (33 miles) from Rohnert Park (c. 41 000 pop).

There are an estimated 13,000 light quakes in the world each year. Earthquakes 4.0 to 5.0 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 two and in the last 365 days twenty-six earthquakes of magnitude 3.0 or greater that has occurred nearby.

Did you feel anything?

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. This data comes from the USGS Earthquake Notification Service. Read more about the earthquake, Seismometer information, Distances, Parameters, Date-Time, Location and details about this quake, that has occurred near: 10 km W of Cobb, California.

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More information

Parameter Value Description
Magnitude 4 mb The magnitude for the event.
Longitude -122.8411° West Decimal degrees longitude. Negative values for western longitudes.
Latitude 38.8077° North Decimal degrees latitude. Negative values for southern latitudes.
Depth 9 km Depth of the event in kilometers.
Place 10 km W of Cobb, California Textual description of named geographic region near to the event. This may be a city name, or a Flinn-Engdahl Region name.
Time 2025-04-04 06:31:49 Time when the event occurred. UTC/GMT
Updated 2025-04-04 06:31:57 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 automatic 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 246 A number describing how significant the event is. Larger numbers indicate a more significant event.
Network ew The ID of a data contributor. Identifies the network considered to be the preferred source of information for this event.
Sources ,ew, A comma-separated list of network contributors.
Number of Stations Used 13 The total number of Number of seismic stations which reported P- and S-arrival times for this earthquake.
Horizontal Distance Horizontal distance from the epicenter to the nearest station (in degrees).
Root Mean Square sec The root-mean-square (RMS) travel time residual, in sec, using all weights.
Azimuthal Gap The largest azimuthal gap between azimuthally adjacent stations (in degrees).
Magnitude Type mw The method or algorithm used to calculate the preferred magnitude for the event.
Event Type earthquake Type of seismic event.
Event ID ew1743748310 Id of event.
Event Code 1743748310 An identifying code assigned by, and unique from, the corresponding source for the event.
Event IDS ,ew1743748310, A comma-separated list of event ids that are associated to an event.

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